TY  - JOUR
AU  - Obradović, Nina
AU  - Gigov, Mihajlo
AU  - Đorđević, Aleksandar
AU  - Kern, Frank
AU  - Dmitrović, S.
AU  - Matović, Branko
AU  - Ðorđević, Antonije
AU  - Tshantshapanyan, Ani
AU  - Vlahović, Branislav
AU  - Petrović, Predrag
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/6372
AB  - The paper presents results of the influence of mechanical activation of shungite, a carbon-mineral rock material rich in silica and carbon, on its sintering behaviour, and obtaining of pure SiC ceramics. The mechanical activation of the starting powder was performed in a high-energy ball mill in time intervals from 30 to 480 min. The phase composition of the starting powders and sintered samples was analysed by the X-ray diffraction method. The first traces of SiC were detected after sintering at 1350 °C for 2 h in an Ar atmosphere, along with traces of unreacted SiO2. The scanning electron microscopy was performed in order to determine changes in the microstructure. Sintering was performed at various temperatures for 2 h, in an Ar atmosphere and a vacuum. Dielectric properties of the sintered samples were measured in the frequency range from 1 to 500 MHz. The obtained results indicate that the sintered powder is a good candidate for applications as an absorber of electromagnetic waves in microwave engineering. © 2019 University of Novi Sad, Faculty of Technology. All rights reserved.
PB  - Novi Sad : Faculty of Technology, University of Novi Sad
T2  - Processing and Application of Ceramics
T1  - Shungite – a carbon-mineral rock material: Its sinterability and possible applications
SP  - 89
EP  - 97
VL  - 13
IS  - 1
DO  - 10.2298/PAC1901089O
UR  - https://hdl.handle.net/21.15107/rcub_dais_6372
ER  - 

@article{
author = "Obradović, Nina and Gigov, Mihajlo and Đorđević, Aleksandar and Kern, Frank and Dmitrović, S. and Matović, Branko and Ðorđević, Antonije and Tshantshapanyan, Ani and Vlahović, Branislav and Petrović, Predrag and Pavlović, Vladimir B.",
year = "2019",
abstract = "The paper presents results of the influence of mechanical activation of shungite, a carbon-mineral rock material rich in silica and carbon, on its sintering behaviour, and obtaining of pure SiC ceramics. The mechanical activation of the starting powder was performed in a high-energy ball mill in time intervals from 30 to 480 min. The phase composition of the starting powders and sintered samples was analysed by the X-ray diffraction method. The first traces of SiC were detected after sintering at 1350 °C for 2 h in an Ar atmosphere, along with traces of unreacted SiO2. The scanning electron microscopy was performed in order to determine changes in the microstructure. Sintering was performed at various temperatures for 2 h, in an Ar atmosphere and a vacuum. Dielectric properties of the sintered samples were measured in the frequency range from 1 to 500 MHz. The obtained results indicate that the sintered powder is a good candidate for applications as an absorber of electromagnetic waves in microwave engineering. © 2019 University of Novi Sad, Faculty of Technology. All rights reserved.",
publisher = "Novi Sad : Faculty of Technology, University of Novi Sad",
journal = "Processing and Application of Ceramics",
title = "Shungite – a carbon-mineral rock material: Its sinterability and possible applications",
pages = "89-97",
volume = "13",
number = "1",
doi = "10.2298/PAC1901089O",
url = "https://hdl.handle.net/21.15107/rcub_dais_6372"
}

Obradović, N., Gigov, M., Đorđević, A., Kern, F., Dmitrović, S., Matović, B., Ðorđević, A., Tshantshapanyan, A., Vlahović, B., Petrović, P.,& Pavlović, V. B.. (2019). Shungite – a carbon-mineral rock material: Its sinterability and possible applications. in Processing and Application of Ceramics
Novi Sad : Faculty of Technology, University of Novi Sad., 13(1), 89-97.
https://doi.org/10.2298/PAC1901089O
https://hdl.handle.net/21.15107/rcub_dais_6372

Obradović N, Gigov M, Đorđević A, Kern F, Dmitrović S, Matović B, Ðorđević A, Tshantshapanyan A, Vlahović B, Petrović P, Pavlović VB. Shungite – a carbon-mineral rock material: Its sinterability and possible applications. in Processing and Application of Ceramics. 2019;13(1):89-97.
doi:10.2298/PAC1901089O
https://hdl.handle.net/21.15107/rcub_dais_6372 .

Obradović, Nina, Gigov, Mihajlo, Đorđević, Aleksandar, Kern, Frank, Dmitrović, S., Matović, Branko, Ðorđević, Antonije, Tshantshapanyan, Ani, Vlahović, Branislav, Petrović, Predrag, Pavlović, Vladimir B., "Shungite – a carbon-mineral rock material: Its sinterability and possible applications" in Processing and Application of Ceramics, 13, no. 1 (2019):89-97,
https://doi.org/10.2298/PAC1901089O .,
https://hdl.handle.net/21.15107/rcub_dais_6372 .

TY  - CONF
AU  - Obradović, Nina
AU  - Gigov, Mihajlo
AU  - Đorđević, Aleksandar
AU  - Kern, Frank
AU  - Dmitrović, Svetlana
AU  - Matović, Branko
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/3667
AB  - The paper presents results of investigation of the influence of mechanical activation of shungite, a Russian natural mineral rich in silica and carbon, on its sintering behavior. The mechanical activation of the starting powder was performed in a high-energy ball mill in time intervals from 0 to 480 minutes. The phase composition of the starting mixtures and sintered samples was analyzed by the X-ray diffraction method. The scanning electron microscopy was performed in order to determine changes in the microstructure. Sintering was performed at various temperatures for 2 h, in an Ar and vacuum atmosphere. Dielectric properties of the sintered samples were measured in the frequency range from 1 to 500 MHz. The obtained results indicate that sintered shungite powder is a good candidate for applications as an absorber of electromagnetic waves in microwave engineering.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018
T1  - Shungite - a Russian mineral: possible application as a microwave absorber
SP  - 94
EP  - 94
UR  - https://hdl.handle.net/21.15107/rcub_dais_3667
ER  - 

@conference{
author = "Obradović, Nina and Gigov, Mihajlo and Đorđević, Aleksandar and Kern, Frank and Dmitrović, Svetlana and Matović, Branko and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2018",
abstract = "The paper presents results of investigation of the influence of mechanical activation of shungite, a Russian natural mineral rich in silica and carbon, on its sintering behavior. The mechanical activation of the starting powder was performed in a high-energy ball mill in time intervals from 0 to 480 minutes. The phase composition of the starting mixtures and sintered samples was analyzed by the X-ray diffraction method. The scanning electron microscopy was performed in order to determine changes in the microstructure. Sintering was performed at various temperatures for 2 h, in an Ar and vacuum atmosphere. Dielectric properties of the sintered samples were measured in the frequency range from 1 to 500 MHz. The obtained results indicate that sintered shungite powder is a good candidate for applications as an absorber of electromagnetic waves in microwave engineering.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018",
title = "Shungite - a Russian mineral: possible application as a microwave absorber",
pages = "94-94",
url = "https://hdl.handle.net/21.15107/rcub_dais_3667"
}

Obradović, N., Gigov, M., Đorđević, A., Kern, F., Dmitrović, S., Matović, B., Đorđević, A.,& Pavlović, V. B.. (2018). Shungite - a Russian mineral: possible application as a microwave absorber. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018
Belgrade : Materials Research Society of Serbia., 94-94.
https://hdl.handle.net/21.15107/rcub_dais_3667

Obradović N, Gigov M, Đorđević A, Kern F, Dmitrović S, Matović B, Đorđević A, Pavlović VB. Shungite - a Russian mineral: possible application as a microwave absorber. in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018. 2018;:94-94.
https://hdl.handle.net/21.15107/rcub_dais_3667 .

Obradović, Nina, Gigov, Mihajlo, Đorđević, Aleksandar, Kern, Frank, Dmitrović, Svetlana, Matović, Branko, Đorđević, Antonije, Pavlović, Vladimir B., "Shungite - a Russian mineral: possible application as a microwave absorber" in Programme and The Book of Abstracts / Twentieth Annual Conference YUCOMAT 2018, Herceg Novi, September 3-7, 2018 (2018):94-94,
https://hdl.handle.net/21.15107/rcub_dais_3667 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Kern, Frank
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/3691
UR  - https://dais.sanu.ac.rs/123456789/4559
AB  - In this study the influence of graphene addition on the microstructure, phase composition, mechanical, and electrical properties of 3Y-TZP ceramics was investigated. Blends of pure 3Y-TZP and with addition of 1 − 4 vol% graphene were prepared by mixing and milling, and they were consolidated by spark plasma sintering (SPS). Addition of 3 vol% graphene is necessary to overcome the percolation threshold and obtain electrically conductive composites. However, rising the graphene contents obstructs sinterability. Hence, flexural strength, Young's modulus, and hardness decrease with increasing the graphene content, and the fracture resistance reaches an intermediate maximum at 2 vol% graphene. Graphene lamellae are oriented orthogonally to the pressing direction. They evidently provide some energy dissipation by crack deflection. TZP-graphene interfaces are very weak. Thus, crack bridging can be neglected. © 2018 Elsevier Ltd and Techna Group S.r.l.
PB  - Elsevier
T2  - Ceramics International
T1  - Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering
SP  - 16931
EP  - 16936
VL  - 44
IS  - 14
DO  - 10.1016/j.ceramint.2018.06.133
UR  - https://hdl.handle.net/21.15107/rcub_dais_4559
ER  - 

@article{
author = "Obradović, Nina and Kern, Frank",
year = "2018",
abstract = "In this study the influence of graphene addition on the microstructure, phase composition, mechanical, and electrical properties of 3Y-TZP ceramics was investigated. Blends of pure 3Y-TZP and with addition of 1 − 4 vol% graphene were prepared by mixing and milling, and they were consolidated by spark plasma sintering (SPS). Addition of 3 vol% graphene is necessary to overcome the percolation threshold and obtain electrically conductive composites. However, rising the graphene contents obstructs sinterability. Hence, flexural strength, Young's modulus, and hardness decrease with increasing the graphene content, and the fracture resistance reaches an intermediate maximum at 2 vol% graphene. Graphene lamellae are oriented orthogonally to the pressing direction. They evidently provide some energy dissipation by crack deflection. TZP-graphene interfaces are very weak. Thus, crack bridging can be neglected. © 2018 Elsevier Ltd and Techna Group S.r.l.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering",
pages = "16931-16936",
volume = "44",
number = "14",
doi = "10.1016/j.ceramint.2018.06.133",
url = "https://hdl.handle.net/21.15107/rcub_dais_4559"
}

Obradović, N.,& Kern, F.. (2018). Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering. in Ceramics International
Elsevier., 44(14), 16931-16936.
https://doi.org/10.1016/j.ceramint.2018.06.133
https://hdl.handle.net/21.15107/rcub_dais_4559

Obradović N, Kern F. Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering. in Ceramics International. 2018;44(14):16931-16936.
doi:10.1016/j.ceramint.2018.06.133
https://hdl.handle.net/21.15107/rcub_dais_4559 .

Obradović, Nina, Kern, Frank, "Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering" in Ceramics International, 44, no. 14 (2018):16931-16936,
https://doi.org/10.1016/j.ceramint.2018.06.133 .,
https://hdl.handle.net/21.15107/rcub_dais_4559 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Kern, Frank
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/3691
AB  - In this study the influence of graphene addition on the microstructure, phase composition, mechanical, and electrical properties of 3Y-TZP ceramics was investigated. Blends of pure 3Y-TZP and with addition of 1 − 4 vol% graphene were prepared by mixing and milling, and they were consolidated by spark plasma sintering (SPS). Addition of 3 vol% graphene is necessary to overcome the percolation threshold and obtain electrically conductive composites. However, rising the graphene contents obstructs sinterability. Hence, flexural strength, Young's modulus, and hardness decrease with increasing the graphene content, and the fracture resistance reaches an intermediate maximum at 2 vol% graphene. Graphene lamellae are oriented orthogonally to the pressing direction. They evidently provide some energy dissipation by crack deflection. TZP-graphene interfaces are very weak. Thus, crack bridging can be neglected. © 2018 Elsevier Ltd and Techna Group S.r.l.
PB  - Elsevier
T2  - Ceramics International
T1  - Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering
SP  - 16931
EP  - 16936
VL  - 44
IS  - 14
DO  - 10.1016/j.ceramint.2018.06.133
UR  - https://hdl.handle.net/21.15107/rcub_dais_3691
ER  - 

@article{
author = "Obradović, Nina and Kern, Frank",
year = "2018",
abstract = "In this study the influence of graphene addition on the microstructure, phase composition, mechanical, and electrical properties of 3Y-TZP ceramics was investigated. Blends of pure 3Y-TZP and with addition of 1 − 4 vol% graphene were prepared by mixing and milling, and they were consolidated by spark plasma sintering (SPS). Addition of 3 vol% graphene is necessary to overcome the percolation threshold and obtain electrically conductive composites. However, rising the graphene contents obstructs sinterability. Hence, flexural strength, Young's modulus, and hardness decrease with increasing the graphene content, and the fracture resistance reaches an intermediate maximum at 2 vol% graphene. Graphene lamellae are oriented orthogonally to the pressing direction. They evidently provide some energy dissipation by crack deflection. TZP-graphene interfaces are very weak. Thus, crack bridging can be neglected. © 2018 Elsevier Ltd and Techna Group S.r.l.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering",
pages = "16931-16936",
volume = "44",
number = "14",
doi = "10.1016/j.ceramint.2018.06.133",
url = "https://hdl.handle.net/21.15107/rcub_dais_3691"
}

Obradović, N.,& Kern, F.. (2018). Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering. in Ceramics International
Elsevier., 44(14), 16931-16936.
https://doi.org/10.1016/j.ceramint.2018.06.133
https://hdl.handle.net/21.15107/rcub_dais_3691

Obradović N, Kern F. Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering. in Ceramics International. 2018;44(14):16931-16936.
doi:10.1016/j.ceramint.2018.06.133
https://hdl.handle.net/21.15107/rcub_dais_3691 .

Obradović, Nina, Kern, Frank, "Properties of 3Y-TZP zirconia ceramics with graphene addition obtained by spark plasma sintering" in Ceramics International, 44, no. 14 (2018):16931-16936,
https://doi.org/10.1016/j.ceramint.2018.06.133 .,
https://hdl.handle.net/21.15107/rcub_dais_3691 .