Zirconia-Based Powders Produced by Plasma-Spray Pyrolisys and Properties of Sintered Ceramics

2nd International Conference on Rheology and Modeling of Materials

Kulkov, S.N.^1 ; Buyakova, S.^1 ; Gömze, L.A.^2

Institute of Strength Physics and Materials Science SB RAS, Russia National Research Tomsk State University, avenue Lenin, 36, Tomsk

634050, Russia^1

Department of Ceramics and Silicate Engineering, University of Miskolc, Miskolc, Hungary^2

关键词: External loading;    Microdistortion;    Nanocrystallines;    Percolation thresholds;    Porous structures;    Sintered ceramics;    Spray pyrolisys;    Zirconia-based ceramics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/790/1/012015/pdf
DOI  :  10.1088/1742-6596/790/1/012015

来源: IOP

【 摘 要 】

It have been studied zirconia-based powders and sintered ceramic. It was shown that in the porous structure of zirconia-based ceramics there is a critical value of porosity the material divides into two sub-systems, being variously deformable under external loading. It have been shown that m-phase in ZrO2is formed due to increase in the microdistortion level which destabilizes the nanocrystalline t phase. It has been found out the correlation between the sizes of crystallites and porosity, which associated with transition of the isolated porous structure to the continuous one and the porosity of 20%, corresponds to the first percolation threshold.