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Physical Properties of Sintered Alumina Doped with Different Oxides

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2018
Filipovic_Science-of-Sintering_50_2018_409-419.pdf (1.466Mb)
Authors
Filipović, Suzana
Obradović, Nina
Marković, Smilja
Đorđević, Antonije
Balać, Igor
Dapčević, Aleksandra
Rogan, Jelena
Pavlović, Vladimir B.
Article (Published version)
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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.

Keywords:
mechanical activation / alumina / sintering / SEM
Source:
Science of Sintering, 2018, 50, 4, 409-419
Publisher:
  • Belgrade : ETRAN
Funding / projects:
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)
  • Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing (RS-45007)
  • Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)

DOI: 10.2298/SOS1804409F

ISSN: 1820-7413

WoS: 000455876800003

Scopus: 2-s2.0-85062894934
[ Google Scholar ]
12
11
Handle
https://hdl.handle.net/21.15107/rcub_dais_4537
URI
https://dais.sanu.ac.rs/123456789/4537
Collections
  • ИТН САНУ - Општа колекција / ITS SASA - General collection
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
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 .

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