TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Mitrić, Miodrag
AU  - Balać, Igor
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0921883119302596
UR  - https://dais.sanu.ac.rs/123456789/7027
AB  - Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - The effect of ball milling on properties of sintered manganese-doped alumina
SP  - 2533
EP  - 2540
VL  - 30
IS  - 11
DO  - 10.1016/j.apt.2019.07.033
UR  - https://hdl.handle.net/21.15107/rcub_dais_7027
ER  - 

@article{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Mitrić, Miodrag and Balać, Igor and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2019",
abstract = "Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "The effect of ball milling on properties of sintered manganese-doped alumina",
pages = "2533-2540",
volume = "30",
number = "11",
doi = "10.1016/j.apt.2019.07.033",
url = "https://hdl.handle.net/21.15107/rcub_dais_7027"
}

Filipović, S., Obradović, N., Marković, S., Mitrić, M., Balać, I., Đorđević, A.,& Pavlović, V. B.. (2019). The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology
Elsevier., 30(11), 2533-2540.
https://doi.org/10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_7027

Filipović S, Obradović N, Marković S, Mitrić M, Balać I, Đorđević A, Pavlović VB. The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology. 2019;30(11):2533-2540.
doi:10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_7027 .

Filipović, Suzana, Obradović, Nina, Marković, Smilja, Mitrić, Miodrag, Balać, Igor, Đorđević, Antonije, Pavlović, Vladimir B., "The effect of ball milling on properties of sintered manganese-doped alumina" in Advanced Powder Technology, 30, no. 11 (2019):2533-2540,
https://doi.org/10.1016/j.apt.2019.07.033 .,
https://hdl.handle.net/21.15107/rcub_dais_7027 .

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Balać, Igor
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/7025
AB  - Corundum (alpha-alumina) is one of the most exploited materials in ceramic industry due to its good physico-chemical properties, mechanical properties, and, importantly, due to its low cost. Advantageous properties, such as hardness, dielectric and thermal properties, and refractoriness, open the door to a wide range of applications of corundum. Porous alumina ceramics is often used for filters and as a catalytic substrate, whereas dense alumina ceramics is frequently used in automotive and aerospace industry. Hence, there is a great interest in exploring this type of ceramics. The aim of this work is to explain the influence of preparation parameters (mechanical activation, addition of transition metal oxides, and sintering conditions) on the final electrical and mechanical properties of alumina. 
As a starting powder, a mix of a few alumina modifications (α-, κ-,γ - Al2O3) was used. It was doped with 1 wt % of Mn2O3, Cr2O3, and NiO, respectively. Three of the obtained mixtures were homogenized and three were ball milled for 60 min. Particle size analysis, SEM, and EDS were performed in order to demonstrate changes in the microstructure after milling. DTA/TG analyses were used to determine all characteristic temperatures. After sintering at 1400 oC in an air atmosphere, mechanical, electrical, and physico-chemical properties of the obtained ceramics were determined. 
Results showed that the mechanical treatment lead to a decrease in temperatures of phase transitions and sintering for approximately 100 oC. Incorporation of cations of transition metals into the crystal lattice of alumina was noticed. Activated and sintered samples showed a higher tensile strength and higher relative dielectric permittivity then the sample doped with Cr2O3. 
The main conclusion of this investigation is that the mechanical activation has the dominant influence on lowering the characteristic temperatures of all detected phase transitions and sintering processes. Using a mixture of several crystalline phases of alumina as a starting powder alleviates the incorporation of transition-metal cations into the alumina crystal lattice, leading to changes in microstructures of the prepared ceramics. Finally, changes in the microstructure and lattice disordering have the dominant influence on the final mechanical properties.
PB  - Societa ceramica italiana
PB  - Politecnico di Torino
C3  - Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019
T1  - Electrical and mechanical properties of alumina doped with transition metal oxides sintered at 1400°C
SP  - 682
EP  - 682
UR  - https://hdl.handle.net/21.15107/rcub_dais_7025
ER  - 

@conference{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Balać, Igor and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2019",
abstract = "Corundum (alpha-alumina) is one of the most exploited materials in ceramic industry due to its good physico-chemical properties, mechanical properties, and, importantly, due to its low cost. Advantageous properties, such as hardness, dielectric and thermal properties, and refractoriness, open the door to a wide range of applications of corundum. Porous alumina ceramics is often used for filters and as a catalytic substrate, whereas dense alumina ceramics is frequently used in automotive and aerospace industry. Hence, there is a great interest in exploring this type of ceramics. The aim of this work is to explain the influence of preparation parameters (mechanical activation, addition of transition metal oxides, and sintering conditions) on the final electrical and mechanical properties of alumina. 
As a starting powder, a mix of a few alumina modifications (α-, κ-,γ - Al2O3) was used. It was doped with 1 wt % of Mn2O3, Cr2O3, and NiO, respectively. Three of the obtained mixtures were homogenized and three were ball milled for 60 min. Particle size analysis, SEM, and EDS were performed in order to demonstrate changes in the microstructure after milling. DTA/TG analyses were used to determine all characteristic temperatures. After sintering at 1400 oC in an air atmosphere, mechanical, electrical, and physico-chemical properties of the obtained ceramics were determined. 
Results showed that the mechanical treatment lead to a decrease in temperatures of phase transitions and sintering for approximately 100 oC. Incorporation of cations of transition metals into the crystal lattice of alumina was noticed. Activated and sintered samples showed a higher tensile strength and higher relative dielectric permittivity then the sample doped with Cr2O3. 
The main conclusion of this investigation is that the mechanical activation has the dominant influence on lowering the characteristic temperatures of all detected phase transitions and sintering processes. Using a mixture of several crystalline phases of alumina as a starting powder alleviates the incorporation of transition-metal cations into the alumina crystal lattice, leading to changes in microstructures of the prepared ceramics. Finally, changes in the microstructure and lattice disordering have the dominant influence on the final mechanical properties.",
publisher = "Societa ceramica italiana, Politecnico di Torino",
journal = "Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019",
title = "Electrical and mechanical properties of alumina doped with transition metal oxides sintered at 1400°C",
pages = "682-682",
url = "https://hdl.handle.net/21.15107/rcub_dais_7025"
}

Filipović, S., Obradović, N., Marković, S., Balać, I., Đorđević, A.,& Pavlović, V. B.. (2019). Electrical and mechanical properties of alumina doped with transition metal oxides sintered at 1400°C. in Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019
Societa ceramica italiana., 682-682.
https://hdl.handle.net/21.15107/rcub_dais_7025

Filipović S, Obradović N, Marković S, Balać I, Đorđević A, Pavlović VB. Electrical and mechanical properties of alumina doped with transition metal oxides sintered at 1400°C. in Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019. 2019;:682-682.
https://hdl.handle.net/21.15107/rcub_dais_7025 .

Filipović, Suzana, Obradović, Nina, Marković, Smilja, Balać, Igor, Đorđević, Antonije, Pavlović, Vladimir B., "Electrical and mechanical properties of alumina doped with transition metal oxides sintered at 1400°C" in Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019 (2019):682-682,
https://hdl.handle.net/21.15107/rcub_dais_7025 .

TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Mitrić, Miodrag
AU  - Balać, Igor
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0921883119302596
UR  - https://dais.sanu.ac.rs/123456789/6951
AB  - Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - The effect of ball milling on properties of sintered manganese-doped alumina
SP  - 2533
EP  - 2540
VL  - 30
IS  - 11
DO  - 10.1016/j.apt.2019.07.033
UR  - https://hdl.handle.net/21.15107/rcub_dais_6951
ER  - 

@article{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Mitrić, Miodrag and Balać, Igor and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2019",
abstract = "Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "The effect of ball milling on properties of sintered manganese-doped alumina",
pages = "2533-2540",
volume = "30",
number = "11",
doi = "10.1016/j.apt.2019.07.033",
url = "https://hdl.handle.net/21.15107/rcub_dais_6951"
}

Filipović, S., Obradović, N., Marković, S., Mitrić, M., Balać, I., Đorđević, A.,& Pavlović, V. B.. (2019). The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology
Elsevier., 30(11), 2533-2540.
https://doi.org/10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_6951

Filipović S, Obradović N, Marković S, Mitrić M, Balać I, Đorđević A, Pavlović VB. The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology. 2019;30(11):2533-2540.
doi:10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_6951 .

Filipović, Suzana, Obradović, Nina, Marković, Smilja, Mitrić, Miodrag, Balać, Igor, Đorđević, Antonije, Pavlović, Vladimir B., "The effect of ball milling on properties of sintered manganese-doped alumina" in Advanced Powder Technology, 30, no. 11 (2019):2533-2540,
https://doi.org/10.1016/j.apt.2019.07.033 .,
https://hdl.handle.net/21.15107/rcub_dais_6951 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Dapčević, Aleksandra
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884219306340
UR  - https://dais.sanu.ac.rs/123456789/5763
AB  - Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
PB  - Elsevier
T2  - Ceramics International
T1  - The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
SP  - 12015
EP  - 12021
VL  - 45
IS  - 9
DO  - 10.1016/j.ceramint.2019.03.095
UR  - https://hdl.handle.net/21.15107/rcub_dais_5763
ER  - 

@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Kosanović, Darko and Dapčević, Aleksandra and Đorđević, Antonije and Balać, Igor and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics",
pages = "12015-12021",
volume = "45",
number = "9",
doi = "10.1016/j.ceramint.2019.03.095",
url = "https://hdl.handle.net/21.15107/rcub_dais_5763"
}

Obradović, N., Fahrenholtz, W. G., Filipović, S., Kosanović, D., Dapčević, A., Đorđević, A., Balać, I.,& Pavlović, V. B.. (2019). The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International
Elsevier., 45(9), 12015-12021.
https://doi.org/10.1016/j.ceramint.2019.03.095
https://hdl.handle.net/21.15107/rcub_dais_5763

Obradović N, Fahrenholtz WG, Filipović S, Kosanović D, Dapčević A, Đorđević A, Balać I, Pavlović VB. The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International. 2019;45(9):12015-12021.
doi:10.1016/j.ceramint.2019.03.095
https://hdl.handle.net/21.15107/rcub_dais_5763 .

Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Kosanović, Darko, Dapčević, Aleksandra, Đorđević, Antonije, Balać, Igor, Pavlović, Vladimir B., "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics" in Ceramics International, 45, no. 9 (2019):12015-12021,
https://doi.org/10.1016/j.ceramint.2019.03.095 .,
https://hdl.handle.net/21.15107/rcub_dais_5763 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Dapčević, Aleksandra
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884219306340
UR  - https://dais.sanu.ac.rs/123456789/5272
AB  - Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
PB  - Elsevier
T2  - Ceramics International
T1  - The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
SP  - 12015
EP  - 12021
VL  - 45
IS  - 9
DO  - 10.1016/j.ceramint.2019.03.095
UR  - https://hdl.handle.net/21.15107/rcub_dais_5272
ER  - 

@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Kosanović, Darko and Dapčević, Aleksandra and Đorđević, Antonije and Balać, Igor and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics",
pages = "12015-12021",
volume = "45",
number = "9",
doi = "10.1016/j.ceramint.2019.03.095",
url = "https://hdl.handle.net/21.15107/rcub_dais_5272"
}

Obradović, N., Fahrenholtz, W. G., Filipović, S., Kosanović, D., Dapčević, A., Đorđević, A., Balać, I.,& Pavlović, V. B.. (2019). The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International
Elsevier., 45(9), 12015-12021.
https://doi.org/10.1016/j.ceramint.2019.03.095
https://hdl.handle.net/21.15107/rcub_dais_5272

Obradović N, Fahrenholtz WG, Filipović S, Kosanović D, Dapčević A, Đorđević A, Balać I, Pavlović VB. The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International. 2019;45(9):12015-12021.
doi:10.1016/j.ceramint.2019.03.095
https://hdl.handle.net/21.15107/rcub_dais_5272 .

Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Kosanović, Darko, Dapčević, Aleksandra, Đorđević, Antonije, Balać, Igor, Pavlović, Vladimir B., "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics" in Ceramics International, 45, no. 9 (2019):12015-12021,
https://doi.org/10.1016/j.ceramint.2019.03.095 .,
https://hdl.handle.net/21.15107/rcub_dais_5272 .

TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Dapčević, Aleksandra
AU  - Rogan, Jelena
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/4537
AB  - Corundum (α-alumina) is a suitable material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 oC and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm3. Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.
PB  - Belgrade : ETRAN
T2  - Science of Sintering
T1  - Physical Properties of Sintered Alumina Doped with Different Oxides
SP  - 409
EP  - 419
VL  - 50
IS  - 4
DO  - 10.2298/SOS1804409F
UR  - https://hdl.handle.net/21.15107/rcub_dais_4537
ER  - 

@article{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Đorđević, Antonije and Balać, Igor and Dapčević, Aleksandra and Rogan, Jelena and Pavlović, Vladimir B.",
year = "2018",
abstract = "Corundum (α-alumina) is a suitable material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 oC and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm3. Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.",
publisher = "Belgrade : ETRAN",
journal = "Science of Sintering",
title = "Physical Properties of Sintered Alumina Doped with Different Oxides",
pages = "409-419",
volume = "50",
number = "4",
doi = "10.2298/SOS1804409F",
url = "https://hdl.handle.net/21.15107/rcub_dais_4537"
}

Filipović, S., Obradović, N., Marković, S., Đorđević, A., Balać, I., Dapčević, A., Rogan, J.,& Pavlović, V. B.. (2018). Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering
Belgrade : ETRAN., 50(4), 409-419.
https://doi.org/10.2298/SOS1804409F
https://hdl.handle.net/21.15107/rcub_dais_4537

Filipović S, Obradović N, Marković S, Đorđević A, Balać I, Dapčević A, Rogan J, Pavlović VB. Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering. 2018;50(4):409-419.
doi:10.2298/SOS1804409F
https://hdl.handle.net/21.15107/rcub_dais_4537 .

Filipović, Suzana, Obradović, Nina, Marković, Smilja, Đorđević, Antonije, Balać, Igor, Dapčević, Aleksandra, Rogan, Jelena, Pavlović, Vladimir B., "Physical Properties of Sintered Alumina Doped with Different Oxides" in Science of Sintering, 50, no. 4 (2018):409-419,
https://doi.org/10.2298/SOS1804409F .,
https://hdl.handle.net/21.15107/rcub_dais_4537 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Mitrić, Miodrag
AU  - Pavlović, Vladimir B.
AU  - Paunović, Vesna
AU  - Kosanović, Darko
AU  - Balać, Igor
AU  - Ristić, Momčilo M.
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/484
AB  - Starting mixtures of BaCO3, ZnO, and TiO2 powders are mechanically activated in a planetary ball mill for various periods of time. The powders obtained are sintered isothermally at 1100°C for 120 min. Non-isothermal sintering process is followed by measurements with a sensitive dilatometer, as well. Results of microstructure characterization using SEM analyses along with DTA analyses are provided. These results are correlated with the values of electric resistivity, capacitance, and loss tangent of the samples, and it is found that with increasing milling time, the increase in values of electrical properties is noticed.
PB  - Springer US
T2  - Powder Metallurgy and Metal Ceramics
T1  - Influence of mechanical activation on electrical properties of barium–zinc–titanate ceramics sintered at 1100°C
SP  - 714
EP  - 718
VL  - 50
IS  - 11-12
DO  - 10.1007/s11106-012-9380-y
UR  - https://hdl.handle.net/21.15107/rcub_dais_484
ER  - 

@article{
author = "Obradović, Nina and Filipović, Suzana and Mitrić, Miodrag and Pavlović, Vladimir B. and Paunović, Vesna and Kosanović, Darko and Balać, Igor and Ristić, Momčilo M.",
year = "2012",
abstract = "Starting mixtures of BaCO3, ZnO, and TiO2 powders are mechanically activated in a planetary ball mill for various periods of time. The powders obtained are sintered isothermally at 1100°C for 120 min. Non-isothermal sintering process is followed by measurements with a sensitive dilatometer, as well. Results of microstructure characterization using SEM analyses along with DTA analyses are provided. These results are correlated with the values of electric resistivity, capacitance, and loss tangent of the samples, and it is found that with increasing milling time, the increase in values of electrical properties is noticed.",
publisher = "Springer US",
journal = "Powder Metallurgy and Metal Ceramics",
title = "Influence of mechanical activation on electrical properties of barium–zinc–titanate ceramics sintered at 1100°C",
pages = "714-718",
volume = "50",
number = "11-12",
doi = "10.1007/s11106-012-9380-y",
url = "https://hdl.handle.net/21.15107/rcub_dais_484"
}

Obradović, N., Filipović, S., Mitrić, M., Pavlović, V. B., Paunović, V., Kosanović, D., Balać, I.,& Ristić, M. M.. (2012). Influence of mechanical activation on electrical properties of barium–zinc–titanate ceramics sintered at 1100°C. in Powder Metallurgy and Metal Ceramics
Springer US., 50(11-12), 714-718.
https://doi.org/10.1007/s11106-012-9380-y
https://hdl.handle.net/21.15107/rcub_dais_484

Obradović N, Filipović S, Mitrić M, Pavlović VB, Paunović V, Kosanović D, Balać I, Ristić MM. Influence of mechanical activation on electrical properties of barium–zinc–titanate ceramics sintered at 1100°C. in Powder Metallurgy and Metal Ceramics. 2012;50(11-12):714-718.
doi:10.1007/s11106-012-9380-y
https://hdl.handle.net/21.15107/rcub_dais_484 .

Obradović, Nina, Filipović, Suzana, Mitrić, Miodrag, Pavlović, Vladimir B., Paunović, Vesna, Kosanović, Darko, Balać, Igor, Ristić, Momčilo M., "Influence of mechanical activation on electrical properties of barium–zinc–titanate ceramics sintered at 1100°C" in Powder Metallurgy and Metal Ceramics, 50, no. 11-12 (2012):714-718,
https://doi.org/10.1007/s11106-012-9380-y .,
https://hdl.handle.net/21.15107/rcub_dais_484 .

TY  - JOUR
AU  - Aleksendrić, D.
AU  - Balać, Igor
AU  - Tang, Chak Yin
AU  - Tsui, C. P.
AU  - Uskoković, Petar S.
AU  - Uskoković, Dragan
PY  - 2010
UR  - https://dais.sanu.ac.rs/123456789/3432
AB  - In this paper, the mechanical properties of polymer matrix phase (modulus of elasticity, yield stress and work hardening rate) have been determined using combined methods such as nanoindentation, finite element modelling and artificial neural networks. The approach of neural modelling has been employed for the functional approximation of the nanoindentation load-displacement curves. The data obtained from finite element analyses have been used for the artificial neural networks training and validating. The neural model of polymer matrix phase of poly-l-lactide (PLLA) polymer in hydroxyapatite (HAp)/PLLA mechanical behaviour has been developed and tested versus unknown data related to the load-displacement curves that were not used during the neural network training. Based on this neural model, the nanoindentation matrix phase properties of PLLA polymer in HAp/PLLA composite have been predicted. © 2010 Institute of Materials, Minerals and Mining.
PB  - Maney Publishing
T2  - Advances in Applied Ceramics
T1  - Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks
SP  - 65
EP  - 70
VL  - 109
IS  - 2
DO  - 10.1179/174367509X12502621261613
UR  - https://hdl.handle.net/21.15107/rcub_dais_3432
ER  - 

@article{
author = "Aleksendrić, D. and Balać, Igor and Tang, Chak Yin and Tsui, C. P. and Uskoković, Petar S. and Uskoković, Dragan",
year = "2010",
abstract = "In this paper, the mechanical properties of polymer matrix phase (modulus of elasticity, yield stress and work hardening rate) have been determined using combined methods such as nanoindentation, finite element modelling and artificial neural networks. The approach of neural modelling has been employed for the functional approximation of the nanoindentation load-displacement curves. The data obtained from finite element analyses have been used for the artificial neural networks training and validating. The neural model of polymer matrix phase of poly-l-lactide (PLLA) polymer in hydroxyapatite (HAp)/PLLA mechanical behaviour has been developed and tested versus unknown data related to the load-displacement curves that were not used during the neural network training. Based on this neural model, the nanoindentation matrix phase properties of PLLA polymer in HAp/PLLA composite have been predicted. © 2010 Institute of Materials, Minerals and Mining.",
publisher = "Maney Publishing",
journal = "Advances in Applied Ceramics",
title = "Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks",
pages = "65-70",
volume = "109",
number = "2",
doi = "10.1179/174367509X12502621261613",
url = "https://hdl.handle.net/21.15107/rcub_dais_3432"
}

Aleksendrić, D., Balać, I., Tang, C. Y., Tsui, C. P., Uskoković, P. S.,& Uskoković, D.. (2010). Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks. in Advances in Applied Ceramics
Maney Publishing., 109(2), 65-70.
https://doi.org/10.1179/174367509X12502621261613
https://hdl.handle.net/21.15107/rcub_dais_3432

Aleksendrić D, Balać I, Tang CY, Tsui CP, Uskoković PS, Uskoković D. Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks. in Advances in Applied Ceramics. 2010;109(2):65-70.
doi:10.1179/174367509X12502621261613
https://hdl.handle.net/21.15107/rcub_dais_3432 .

Aleksendrić, D., Balać, Igor, Tang, Chak Yin, Tsui, C. P., Uskoković, Petar S., Uskoković, Dragan, "Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks" in Advances in Applied Ceramics, 109, no. 2 (2010):65-70,
https://doi.org/10.1179/174367509X12502621261613 .,
https://hdl.handle.net/21.15107/rcub_dais_3432 .

TY  - BOOK
AU  - Balać, Igor
AU  - Bugarski, Branko
AU  - Ćosić, Irena
AU  - Dramićanin, Miroslav
AU  - Đorđević, Drago
AU  - Filipović, Nenad D.
AU  - Ignjatović, Nenad
AU  - Janaćković, Đorđe
AU  - Kojić, Miloš
AU  - Manojlović, Verica
AU  - Marković, Zoran
AU  - Obradović, Bojana
AU  - Pajić Lijaković, Ivana
AU  - Pavlović, Miodrag
AU  - Plavšić, Milenko
AU  - Raković, Dejan
AU  - Ranković, Vladimir
AU  - Stojanović, Boban
AU  - Trajković, Vladimir
AU  - Uskoković, Dragan
AU  - Uskoković, Petar S.
AU  - Veljković, Dejan
AU  - Vlastelica, Ivo
AU  - Vunjak Novaković, Gordana
PY  - 2010
UR  - https://dais.sanu.ac.rs/123456789/121
AB  - Početak XXI veka nesumnjivo je obeležen interdisciplinarnim i multidisciplinarnim naporima istraživača u različitim oblastima nauke. Jedna od najizrazitijih tendencija ovog tipa uočava se u biomedicinskim istraživanjima, gde se združuju napori lekara, biologa, genetičara i biohemičara, s jedne strane, i biofizičara i inženjera, s druge strane – sa ciljem dubljeg razumevanja zdravlja i bolesti, i primene ovih saznanja u biomedicinskoj praksi, tako važnoj u svakodnevnom životu ljudi.
Kao rezultat ovih svetskih trendova, u Srbiji već više godina na nekoliko fakulteta postoji nastava iz oblasti biomedicinskog inženjerstva, sa ciljem da osposobi inženjere ovih usmerenja za multidisciplinarno povezivanje znanja iz oblasti tehnike sa biomedicinskim znanjima. Jedan od bazičnih predmeta ovih usmerenja jesu Biomaterijali, kojima je i posvećen naš udžbenik, čiji je cilj da predstavi pregled teorije i prakse biomaterijala u biomedicinskoj nauci.
Nauka o biomaterijalima je nesumnjivo najmultidisciplinarnija od svih nauka, jer zahteva ovladavanje znanjima iz mnogih oblasti nauke i tehnologije, inženjerstva i medicine, kako bi naučnici iz oblasti biomaterijala mogli da se uhvate u koštac sa ovom profesijom. Zato posle uvodnog dela, udžbenik iz Biomaterijala sadrži četiri celine: (I) Osnovni biomedicinski koncepti i reakcije organizma na biomaterijale, (II) Struktura, fizičko-mehanička karakterizacija i modeliranje biomaterijala i tkiva, (III) Savremeni biomaterijali i tehnologije, (IV) Perspektive biomaterijala i tehnologija, iza kojih slede Zadaci sa rešenjima, Ispitna test pitanja i Ispitna teorijska pitanja, koji pomažu studentima da lakše savladaju veoma obimno i kompleksno gradivo. Na kraju svakog poglavlja data su pitanja za rekapitulaciju, kao i spisak dopunske literature za opcionu detaljniju obradu pojedinih oblasti.
Grupa od dvadeset četiri profesionalca sa univerziteta i naučnih instituta, pod okriljem Instituta tehničkih nauka Srpske akademije nauka i umetnosti, Beograd, i Društva za istraživanje materijala Srbije (MRS Srbija) doprinela je pisanju ovog kapitalnog udžbenika o biomaterijalima, prvog do sada na srpskom jeziku. Mada uključivanje veće grupe autora nužno dovodi do stilske neujednačenosti, ipak je oblast biomaterijala toliko multidisciplinarna da je ovakav pristup bio neophodan, kako uostalom pokazuju slična svetska iskustva sa uključivanjem i preko pedeset autora. Ipak urednici su se potrudili da koliko je to moguće stilski i pedagoški ujednače udžbenik, kako bi bio korisna literatura za sve studente diplomskih, master i doktorskih studija iz biomedicinskog inženjerstva u Srbiji i okruženju.
PB  - Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala
T1  - Biomaterijali
UR  - https://hdl.handle.net/21.15107/rcub_dais_121
ER  - 

@book{
author = "Balać, Igor and Bugarski, Branko and Ćosić, Irena and Dramićanin, Miroslav and Đorđević, Drago and Filipović, Nenad D. and Ignjatović, Nenad and Janaćković, Đorđe and Kojić, Miloš and Manojlović, Verica and Marković, Zoran and Obradović, Bojana and Pajić Lijaković, Ivana and Pavlović, Miodrag and Plavšić, Milenko and Raković, Dejan and Ranković, Vladimir and Stojanović, Boban and Trajković, Vladimir and Uskoković, Dragan and Uskoković, Petar S. and Veljković, Dejan and Vlastelica, Ivo and Vunjak Novaković, Gordana",
year = "2010",
abstract = "Početak XXI veka nesumnjivo je obeležen interdisciplinarnim i multidisciplinarnim naporima istraživača u različitim oblastima nauke. Jedna od najizrazitijih tendencija ovog tipa uočava se u biomedicinskim istraživanjima, gde se združuju napori lekara, biologa, genetičara i biohemičara, s jedne strane, i biofizičara i inženjera, s druge strane – sa ciljem dubljeg razumevanja zdravlja i bolesti, i primene ovih saznanja u biomedicinskoj praksi, tako važnoj u svakodnevnom životu ljudi.
Kao rezultat ovih svetskih trendova, u Srbiji već više godina na nekoliko fakulteta postoji nastava iz oblasti biomedicinskog inženjerstva, sa ciljem da osposobi inženjere ovih usmerenja za multidisciplinarno povezivanje znanja iz oblasti tehnike sa biomedicinskim znanjima. Jedan od bazičnih predmeta ovih usmerenja jesu Biomaterijali, kojima je i posvećen naš udžbenik, čiji je cilj da predstavi pregled teorije i prakse biomaterijala u biomedicinskoj nauci.
Nauka o biomaterijalima je nesumnjivo najmultidisciplinarnija od svih nauka, jer zahteva ovladavanje znanjima iz mnogih oblasti nauke i tehnologije, inženjerstva i medicine, kako bi naučnici iz oblasti biomaterijala mogli da se uhvate u koštac sa ovom profesijom. Zato posle uvodnog dela, udžbenik iz Biomaterijala sadrži četiri celine: (I) Osnovni biomedicinski koncepti i reakcije organizma na biomaterijale, (II) Struktura, fizičko-mehanička karakterizacija i modeliranje biomaterijala i tkiva, (III) Savremeni biomaterijali i tehnologije, (IV) Perspektive biomaterijala i tehnologija, iza kojih slede Zadaci sa rešenjima, Ispitna test pitanja i Ispitna teorijska pitanja, koji pomažu studentima da lakše savladaju veoma obimno i kompleksno gradivo. Na kraju svakog poglavlja data su pitanja za rekapitulaciju, kao i spisak dopunske literature za opcionu detaljniju obradu pojedinih oblasti.
Grupa od dvadeset četiri profesionalca sa univerziteta i naučnih instituta, pod okriljem Instituta tehničkih nauka Srpske akademije nauka i umetnosti, Beograd, i Društva za istraživanje materijala Srbije (MRS Srbija) doprinela je pisanju ovog kapitalnog udžbenika o biomaterijalima, prvog do sada na srpskom jeziku. Mada uključivanje veće grupe autora nužno dovodi do stilske neujednačenosti, ipak je oblast biomaterijala toliko multidisciplinarna da je ovakav pristup bio neophodan, kako uostalom pokazuju slična svetska iskustva sa uključivanjem i preko pedeset autora. Ipak urednici su se potrudili da koliko je to moguće stilski i pedagoški ujednače udžbenik, kako bi bio korisna literatura za sve studente diplomskih, master i doktorskih studija iz biomedicinskog inženjerstva u Srbiji i okruženju.",
publisher = "Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala",
title = "Biomaterijali",
url = "https://hdl.handle.net/21.15107/rcub_dais_121"
}

Balać, I., Bugarski, B., Ćosić, I., Dramićanin, M., Đorđević, D., Filipović, N. D., Ignjatović, N., Janaćković, Đ., Kojić, M., Manojlović, V., Marković, Z., Obradović, B., Pajić Lijaković, I., Pavlović, M., Plavšić, M., Raković, D., Ranković, V., Stojanović, B., Trajković, V., Uskoković, D., Uskoković, P. S., Veljković, D., Vlastelica, I.,& Vunjak Novaković, G.. (2010). Biomaterijali. 
Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala..
https://hdl.handle.net/21.15107/rcub_dais_121

Balać I, Bugarski B, Ćosić I, Dramićanin M, Đorđević D, Filipović ND, Ignjatović N, Janaćković Đ, Kojić M, Manojlović V, Marković Z, Obradović B, Pajić Lijaković I, Pavlović M, Plavšić M, Raković D, Ranković V, Stojanović B, Trajković V, Uskoković D, Uskoković PS, Veljković D, Vlastelica I, Vunjak Novaković G. Biomaterijali. 2010;.
https://hdl.handle.net/21.15107/rcub_dais_121 .

Balać, Igor, Bugarski, Branko, Ćosić, Irena, Dramićanin, Miroslav, Đorđević, Drago, Filipović, Nenad D., Ignjatović, Nenad, Janaćković, Đorđe, Kojić, Miloš, Manojlović, Verica, Marković, Zoran, Obradović, Bojana, Pajić Lijaković, Ivana, Pavlović, Miodrag, Plavšić, Milenko, Raković, Dejan, Ranković, Vladimir, Stojanović, Boban, Trajković, Vladimir, Uskoković, Dragan, Uskoković, Petar S., Veljković, Dejan, Vlastelica, Ivo, Vunjak Novaković, Gordana, "Biomaterijali" (2010),
https://hdl.handle.net/21.15107/rcub_dais_121 .

TY  - JOUR
AU  - Balać, Igor
AU  - Aleksendrić, Dragan
AU  - Tang, Chak Yin
AU  - Tsui, C.P.
AU  - Uskoković, Petar S.
AU  - Uskoković, Dragan
PY  - 2007
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/752
UR  - https://dais.sanu.ac.rs/123456789/13368
AB  - In this work, a combination of nanoindentation experiment and finite element modeling is proposed in order to obtain approximate material behavior of PLLA polymer in hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite. Knowing these properties is important since the processing conditions used in hot pressing of composites with thermoplastic matrix strongly influence final mechanical properties of material in the solid state. A bi-linear material behavior is adopted for the polymer phase of the HAp/PLLA composite. Material behavior model, stress-strain curve, is determined by modulus of elasticity, yield stress and work-hardening rate. This combined method is proposed to determine material behavior before (modulus of elasticity) and after yield point (work hardening rate) of polymer phase after the hot-pressing of the composite. .
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method
SP  - 277
EP  - 286
VL  - 13
IS  - 4
UR  - https://hdl.handle.net/21.15107/rcub_dais_13368
ER  - 

@article{
author = "Balać, Igor and Aleksendrić, Dragan and Tang, Chak Yin and Tsui, C.P. and Uskoković, Petar S. and Uskoković, Dragan",
year = "2007",
abstract = "In this work, a combination of nanoindentation experiment and finite element modeling is proposed in order to obtain approximate material behavior of PLLA polymer in hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite. Knowing these properties is important since the processing conditions used in hot pressing of composites with thermoplastic matrix strongly influence final mechanical properties of material in the solid state. A bi-linear material behavior is adopted for the polymer phase of the HAp/PLLA composite. Material behavior model, stress-strain curve, is determined by modulus of elasticity, yield stress and work-hardening rate. This combined method is proposed to determine material behavior before (modulus of elasticity) and after yield point (work hardening rate) of polymer phase after the hot-pressing of the composite. .",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method",
pages = "277-286",
volume = "13",
number = "4",
url = "https://hdl.handle.net/21.15107/rcub_dais_13368"
}

Balać, I., Aleksendrić, D., Tang, C. Y., Tsui, C.P., Uskoković, P. S.,& Uskoković, D.. (2007). Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 13(4), 277-286.
https://hdl.handle.net/21.15107/rcub_dais_13368

Balać I, Aleksendrić D, Tang CY, Tsui C, Uskoković PS, Uskoković D. Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method. in Metalurgija. 2007;13(4):277-286.
https://hdl.handle.net/21.15107/rcub_dais_13368 .

Balać, Igor, Aleksendrić, Dragan, Tang, Chak Yin, Tsui, C.P., Uskoković, Petar S., Uskoković, Dragan, "Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method" in Metalurgija, 13, no. 4 (2007):277-286,
https://hdl.handle.net/21.15107/rcub_dais_13368 .

TY  - CONF
AU  - Balać, Igor
AU  - Tang, Chak Yin
AU  - Tsui, C. P.
AU  - Chen, D. Z.
AU  - Uskoković, Petar
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2006
UR  - https://dais.sanu.ac.rs/123456789/11712
AB  - In order to obtain more accurate properties after compaction of hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite, high-resolution measurement of mechanical properties method is proposed to determine the properties of each phase separately, leading to information that are valuable for the development of new materials as well as for predictive modeling purposes. The PLLA polymer processing conditions used in hot pressing of the composite strongly influence final mechanical properties of the material in the solid state. Since the aim was to measure PLLA material properties, acceptable findings could only be made using unconstrained, cured in situ nanoindentation tests. A finite element analysis of the in situ indentation experiment was performed to determine required size of plain polymer area, needed for indentation test, which would minimize the particle influence on the matrix elastic behavior.
PB  - Durnten-Zurich : Trans Tech Publications Ltd.
C3  - Recent Developments in Advanced Materials and Processes
T1  - Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites
SP  - 501
EP  - 506
DO  - 10.4028/www.scientific.net/MSF.518.501
UR  - https://hdl.handle.net/21.15107/rcub_dais_11712
ER  - 

@conference{
author = "Balać, Igor and Tang, Chak Yin and Tsui, C. P. and Chen, D. Z. and Uskoković, Petar and Ignjatović, Nenad and Uskoković, Dragan",
year = "2006",
abstract = "In order to obtain more accurate properties after compaction of hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite, high-resolution measurement of mechanical properties method is proposed to determine the properties of each phase separately, leading to information that are valuable for the development of new materials as well as for predictive modeling purposes. The PLLA polymer processing conditions used in hot pressing of the composite strongly influence final mechanical properties of the material in the solid state. Since the aim was to measure PLLA material properties, acceptable findings could only be made using unconstrained, cured in situ nanoindentation tests. A finite element analysis of the in situ indentation experiment was performed to determine required size of plain polymer area, needed for indentation test, which would minimize the particle influence on the matrix elastic behavior.",
publisher = "Durnten-Zurich : Trans Tech Publications Ltd.",
journal = "Recent Developments in Advanced Materials and Processes",
title = "Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites",
pages = "501-506",
doi = "10.4028/www.scientific.net/MSF.518.501",
url = "https://hdl.handle.net/21.15107/rcub_dais_11712"
}

Balać, I., Tang, C. Y., Tsui, C. P., Chen, D. Z., Uskoković, P., Ignjatović, N.,& Uskoković, D.. (2006). Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites. in Recent Developments in Advanced Materials and Processes
Durnten-Zurich : Trans Tech Publications Ltd.., 501-506.
https://doi.org/10.4028/www.scientific.net/MSF.518.501
https://hdl.handle.net/21.15107/rcub_dais_11712

Balać I, Tang CY, Tsui CP, Chen DZ, Uskoković P, Ignjatović N, Uskoković D. Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites. in Recent Developments in Advanced Materials and Processes. 2006;:501-506.
doi:10.4028/www.scientific.net/MSF.518.501
https://hdl.handle.net/21.15107/rcub_dais_11712 .

Balać, Igor, Tang, Chak Yin, Tsui, C. P., Chen, D. Z., Uskoković, Petar, Ignjatović, Nenad, Uskoković, Dragan, "Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites" in Recent Developments in Advanced Materials and Processes (2006):501-506,
https://doi.org/10.4028/www.scientific.net/MSF.518.501 .,
https://hdl.handle.net/21.15107/rcub_dais_11712 .

TY  - JOUR
AU  - Balać, Igor
AU  - Milovančević, Milorad
AU  - Tang, Chak Yin
AU  - Uskoković, Petar S.
AU  - Uskoković, Dragan
PY  - 2004
UR  - https://dais.sanu.ac.rs/123456789/13319
AB  - A three-dimensional (3D) finite element (FE) unit cell model is applied to studies on the elastic properties of ceramic spherical particle-polymer composite. In this model, hydroxyapatite particles (HAp) are assumed to be spherical and are arranged on a face-centered cubic (FCC) array in poly-L-lactide (PLLA) matrix surrounding. The three dimensionality of the proposed model enables simulation of elastic properties as well as developed stress states. The FE calculations provide estimates of compressive elastic modulus, shear modulus, Poisson's ratio and stress state of the composite for a range of particle volume fractions. The FCC unit cell FE models are evaluated by comparison to available experimental results, simple cubic (SC) unit cell FE calculations and Halpin-Tsai equations. In applying unit cell models for predicting elastic properties of particle-filled composites, the FCC arrangement can be observed to be more accurate compared with the SC arrangement.
PB  - Elsevier, Amsterdam
T2  - Materials Letters
T1  - Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model
SP  - 2437
EP  - 2441
VL  - 58
IS  - 19
DO  - 10.1016/j.matlet.2004.02.033
UR  - https://hdl.handle.net/21.15107/rcub_dais_13319
ER  - 

@article{
author = "Balać, Igor and Milovančević, Milorad and Tang, Chak Yin and Uskoković, Petar S. and Uskoković, Dragan",
year = "2004",
abstract = "A three-dimensional (3D) finite element (FE) unit cell model is applied to studies on the elastic properties of ceramic spherical particle-polymer composite. In this model, hydroxyapatite particles (HAp) are assumed to be spherical and are arranged on a face-centered cubic (FCC) array in poly-L-lactide (PLLA) matrix surrounding. The three dimensionality of the proposed model enables simulation of elastic properties as well as developed stress states. The FE calculations provide estimates of compressive elastic modulus, shear modulus, Poisson's ratio and stress state of the composite for a range of particle volume fractions. The FCC unit cell FE models are evaluated by comparison to available experimental results, simple cubic (SC) unit cell FE calculations and Halpin-Tsai equations. In applying unit cell models for predicting elastic properties of particle-filled composites, the FCC arrangement can be observed to be more accurate compared with the SC arrangement.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Letters",
title = "Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model",
pages = "2437-2441",
volume = "58",
number = "19",
doi = "10.1016/j.matlet.2004.02.033",
url = "https://hdl.handle.net/21.15107/rcub_dais_13319"
}

Balać, I., Milovančević, M., Tang, C. Y., Uskoković, P. S.,& Uskoković, D.. (2004). Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model. in Materials Letters
Elsevier, Amsterdam., 58(19), 2437-2441.
https://doi.org/10.1016/j.matlet.2004.02.033
https://hdl.handle.net/21.15107/rcub_dais_13319

Balać I, Milovančević M, Tang CY, Uskoković PS, Uskoković D. Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model. in Materials Letters. 2004;58(19):2437-2441.
doi:10.1016/j.matlet.2004.02.033
https://hdl.handle.net/21.15107/rcub_dais_13319 .

Balać, Igor, Milovančević, Milorad, Tang, Chak Yin, Uskoković, Petar S., Uskoković, Dragan, "Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model" in Materials Letters, 58, no. 19 (2004):2437-2441,
https://doi.org/10.1016/j.matlet.2004.02.033 .,
https://hdl.handle.net/21.15107/rcub_dais_13319 .

TY  - JOUR
AU  - Balać, Igor
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
AU  - Uskoković, Dragan
PY  - 2002
UR  - https://dais.sanu.ac.rs/123456789/10669
AB  - The influence of particle geometry and volume fraction on the mechanical properties of a hydroxyapatite (HAp) particulate reinforced polymer (poly-L-lactide and collagen) matrix composite was investigated through finite-element (FE) analysis. For cube-shaped (near sharp and curved corners and edges) embedded particles, it was found that the maximum stress concentration factor (SCF) in the matrix decreases with an increase of the HAp particle volume fraction (PVF). The maximum stress concentration in the matrix material containing a spherical inclusion has low sensitivity to the PVF. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to PVF. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the Halpin-Tsai model.
PB  - Wiley
T2  - Journal of Biomedical Materials Research
T1  - Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites
SP  - 793
EP  - 799
VL  - 63
IS  - 6
DO  - 10.1002/jbm.10407
UR  - https://hdl.handle.net/21.15107/rcub_dais_10669
ER  - 

@article{
author = "Balać, Igor and Uskoković, Petar and Aleksić, Radoslav and Uskoković, Dragan",
year = "2002",
abstract = "The influence of particle geometry and volume fraction on the mechanical properties of a hydroxyapatite (HAp) particulate reinforced polymer (poly-L-lactide and collagen) matrix composite was investigated through finite-element (FE) analysis. For cube-shaped (near sharp and curved corners and edges) embedded particles, it was found that the maximum stress concentration factor (SCF) in the matrix decreases with an increase of the HAp particle volume fraction (PVF). The maximum stress concentration in the matrix material containing a spherical inclusion has low sensitivity to the PVF. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to PVF. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the Halpin-Tsai model.",
publisher = "Wiley",
journal = "Journal of Biomedical Materials Research",
title = "Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites",
pages = "793-799",
volume = "63",
number = "6",
doi = "10.1002/jbm.10407",
url = "https://hdl.handle.net/21.15107/rcub_dais_10669"
}

Balać, I., Uskoković, P., Aleksić, R.,& Uskoković, D.. (2002). Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites. in Journal of Biomedical Materials Research
Wiley., 63(6), 793-799.
https://doi.org/10.1002/jbm.10407
https://hdl.handle.net/21.15107/rcub_dais_10669

Balać I, Uskoković P, Aleksić R, Uskoković D. Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites. in Journal of Biomedical Materials Research. 2002;63(6):793-799.
doi:10.1002/jbm.10407
https://hdl.handle.net/21.15107/rcub_dais_10669 .

Balać, Igor, Uskoković, Petar, Aleksić, Radoslav, Uskoković, Dragan, "Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites" in Journal of Biomedical Materials Research, 63, no. 6 (2002):793-799,
https://doi.org/10.1002/jbm.10407 .,
https://hdl.handle.net/21.15107/rcub_dais_10669 .

TY  - JOUR
AU  - Balać, Igor
AU  - Uskoković, Petar
AU  - Ignjatović, Nenad
AU  - Aleksić, Radomir
AU  - Uskoković, Dragan
PY  - 2001
UR  - https://dais.sanu.ac.rs/123456789/13318
AB  - A three-dimensional (3D) finite element (FE) analysis of the stress concentration factor (SCF) in biocomposite model cell has been performed. The model composite consisted of a hydroxyapatite hard particle (HAp) embedded in poly-L-lactide soft matrix (PLLA). Two cases were considered, namely the shape of the particle was held constant while the volume fraction of HAp was varied and the particle shape was changed whilst the volume fraction was constant. For block shaped embedded particles, it was found that the SCF decreases with an increase of the HAp particle volume fraction. It was also found that the shape of reinforcing particles had little effect on the mechanical behaviour of material.
PB  - Elsevier, Amsterdam
T2  - Computational Materials Science
T1  - Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials
SP  - 275
EP  - 283
VL  - 20
IS  - 2
DO  - 10.1016/S0927-0256(00)00182-8
UR  - https://hdl.handle.net/21.15107/rcub_dais_13318
ER  - 

@article{
author = "Balać, Igor and Uskoković, Petar and Ignjatović, Nenad and Aleksić, Radomir and Uskoković, Dragan",
year = "2001",
abstract = "A three-dimensional (3D) finite element (FE) analysis of the stress concentration factor (SCF) in biocomposite model cell has been performed. The model composite consisted of a hydroxyapatite hard particle (HAp) embedded in poly-L-lactide soft matrix (PLLA). Two cases were considered, namely the shape of the particle was held constant while the volume fraction of HAp was varied and the particle shape was changed whilst the volume fraction was constant. For block shaped embedded particles, it was found that the SCF decreases with an increase of the HAp particle volume fraction. It was also found that the shape of reinforcing particles had little effect on the mechanical behaviour of material.",
publisher = "Elsevier, Amsterdam",
journal = "Computational Materials Science",
title = "Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials",
pages = "275-283",
volume = "20",
number = "2",
doi = "10.1016/S0927-0256(00)00182-8",
url = "https://hdl.handle.net/21.15107/rcub_dais_13318"
}

Balać, I., Uskoković, P., Ignjatović, N., Aleksić, R.,& Uskoković, D.. (2001). Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials. in Computational Materials Science
Elsevier, Amsterdam., 20(2), 275-283.
https://doi.org/10.1016/S0927-0256(00)00182-8
https://hdl.handle.net/21.15107/rcub_dais_13318

Balać I, Uskoković P, Ignjatović N, Aleksić R, Uskoković D. Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials. in Computational Materials Science. 2001;20(2):275-283.
doi:10.1016/S0927-0256(00)00182-8
https://hdl.handle.net/21.15107/rcub_dais_13318 .

Balać, Igor, Uskoković, Petar, Ignjatović, Nenad, Aleksić, Radomir, Uskoković, Dragan, "Stress analysis in hydroxyapatite/poly-L-lactide composite biomaterials" in Computational Materials Science, 20, no. 2 (2001):275-283,
https://doi.org/10.1016/S0927-0256(00)00182-8 .,
https://hdl.handle.net/21.15107/rcub_dais_13318 .