Kinetics of Mechanically Activated TiO2-based Oxides Followed by DTA
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TiO2-based materials are widely used in production of ceramic capacitors and semiconductors. The conventional method of ceramics synthesis relies on the solid-state reaction between TiO2 and other compounds (BaCO3, BaO, ZnO, MgO and SrCO3) at high temperatures. During this reaction control of final stoichiometry and powder characteristics are difficult to maintain, because of the lack of the consistency in initial raw material's mixture and the existence of local inhomogeneities in reaction product which occur as a result of incomplete mixing and incomplete reaction of the constituents. In the most cases the sintering kinetics of these ceramics are determined by several parameters, including pressed powder density, material's particle size, sintering temperature, atmosphere etc. As a result, during thermal treatment mass transport by plastic flow, bulk diffusion, surface and volume diffusion, grain boundary diffusion, or a combination of these processes may occur. In order to produce n...anocrystalline powders and improve the sintering kinetics, high energy mechanical activation can be employed among other methods. DTA analyses indicated that the position of DTA exothermic peak assigned to the process of ceramics formation was shifted toward lower temperatures in activated samples. The distinction in that peak magnitude due to activation process was observed as well. These results pointed out an increase of the solid state reaction rate, due to activation process. It was concluded that mechanical activation provoked the acceleration of mass transport and enhanced the nucleation probability of a new phase, which caused the decrease of synthesis reaction temperature.
Keywords:
TiO2 / oxides / mechanical activation / powder technologySource:
The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts, 2012, 24-24Publisher:
- Belgrade : Serbian Ceramic Society
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Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - CONF AU - Obradović, Nina AU - Pavlović, Vera P. AU - Filipović, Suzana AU - Kosanović, Darko AU - Pavlović, Vladimir B. PY - 2012 UR - https://dais.sanu.ac.rs/123456789/524 AB - TiO2-based materials are widely used in production of ceramic capacitors and semiconductors. The conventional method of ceramics synthesis relies on the solid-state reaction between TiO2 and other compounds (BaCO3, BaO, ZnO, MgO and SrCO3) at high temperatures. During this reaction control of final stoichiometry and powder characteristics are difficult to maintain, because of the lack of the consistency in initial raw material's mixture and the existence of local inhomogeneities in reaction product which occur as a result of incomplete mixing and incomplete reaction of the constituents. In the most cases the sintering kinetics of these ceramics are determined by several parameters, including pressed powder density, material's particle size, sintering temperature, atmosphere etc. As a result, during thermal treatment mass transport by plastic flow, bulk diffusion, surface and volume diffusion, grain boundary diffusion, or a combination of these processes may occur. In order to produce nanocrystalline powders and improve the sintering kinetics, high energy mechanical activation can be employed among other methods. DTA analyses indicated that the position of DTA exothermic peak assigned to the process of ceramics formation was shifted toward lower temperatures in activated samples. The distinction in that peak magnitude due to activation process was observed as well. These results pointed out an increase of the solid state reaction rate, due to activation process. It was concluded that mechanical activation provoked the acceleration of mass transport and enhanced the nucleation probability of a new phase, which caused the decrease of synthesis reaction temperature. PB - Belgrade : Serbian Ceramic Society C3 - The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts T1 - Kinetics of Mechanically Activated TiO2-based Oxides Followed by DTA SP - 24 EP - 24 UR - https://hdl.handle.net/21.15107/rcub_dais_524 ER -
@conference{ author = "Obradović, Nina and Pavlović, Vera P. and Filipović, Suzana and Kosanović, Darko and Pavlović, Vladimir B.", year = "2012", abstract = "TiO2-based materials are widely used in production of ceramic capacitors and semiconductors. The conventional method of ceramics synthesis relies on the solid-state reaction between TiO2 and other compounds (BaCO3, BaO, ZnO, MgO and SrCO3) at high temperatures. During this reaction control of final stoichiometry and powder characteristics are difficult to maintain, because of the lack of the consistency in initial raw material's mixture and the existence of local inhomogeneities in reaction product which occur as a result of incomplete mixing and incomplete reaction of the constituents. In the most cases the sintering kinetics of these ceramics are determined by several parameters, including pressed powder density, material's particle size, sintering temperature, atmosphere etc. As a result, during thermal treatment mass transport by plastic flow, bulk diffusion, surface and volume diffusion, grain boundary diffusion, or a combination of these processes may occur. In order to produce nanocrystalline powders and improve the sintering kinetics, high energy mechanical activation can be employed among other methods. DTA analyses indicated that the position of DTA exothermic peak assigned to the process of ceramics formation was shifted toward lower temperatures in activated samples. The distinction in that peak magnitude due to activation process was observed as well. These results pointed out an increase of the solid state reaction rate, due to activation process. It was concluded that mechanical activation provoked the acceleration of mass transport and enhanced the nucleation probability of a new phase, which caused the decrease of synthesis reaction temperature.", publisher = "Belgrade : Serbian Ceramic Society", journal = "The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts", title = "Kinetics of Mechanically Activated TiO2-based Oxides Followed by DTA", pages = "24-24", url = "https://hdl.handle.net/21.15107/rcub_dais_524" }
Obradović, N., Pavlović, V. P., Filipović, S., Kosanović, D.,& Pavlović, V. B.. (2012). Kinetics of Mechanically Activated TiO2-based Oxides Followed by DTA. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts Belgrade : Serbian Ceramic Society., 24-24. https://hdl.handle.net/21.15107/rcub_dais_524
Obradović N, Pavlović VP, Filipović S, Kosanović D, Pavlović VB. Kinetics of Mechanically Activated TiO2-based Oxides Followed by DTA. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts. 2012;:24-24. https://hdl.handle.net/21.15107/rcub_dais_524 .
Obradović, Nina, Pavlović, Vera P., Filipović, Suzana, Kosanović, Darko, Pavlović, Vladimir B., "Kinetics of Mechanically Activated TiO2-based Oxides Followed by DTA" in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts (2012):24-24, https://hdl.handle.net/21.15107/rcub_dais_524 .