Effects of transient thermal shock loadings on the structure of zirconia ceramics

International Conference and Youth Scientific School on "Materials and Technologies of New Generations in Modern Materials Science"

Derkach, E.A.^1,2 ; Buyakova, S.P.^1,2,3 ; Kulkov, S.N.^1,2,3

National Research Tomsk Polytechnic University, 30 Lenin ave., Tomsk

634050, Russia^1

Institute of Strength Physics and Materials Science, SB RAS, 2/4 pr. Akademicheskii, Tomsk

634055, Russia^2

National Research Tomsk State University, 36 Lenin ave., Tomsk

634050, Russia^3

关键词: Block structures;    Coherent X-ray scattering;    Crystal system;    High temperature;    Low temperatures;    Thermal shock loading;    Zirconia ceramic;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/156/1/012029/pdf
DOI  :  10.1088/1757-899X/156/1/012029

来源: IOP

【 摘 要 】

In this paper the influence of thermal shock loadings on the phase composition and microstructure of ZrO2(Y2O3) and ZrO2(MgO) ceramics was studied. It was found that thermal shock strains were no effect on phase composition of ZrO2(Y2O3) ceramics. Reducing the concentration of high-temperature tetragonal t-ZrO2and cubic c-ZrO2modifications and rising the content of low-temperature monoclinic m-ZrO2crystal system with increasing the number of thermal shock strains were observed. The values of region coherent X-ray scattering of ZrO2(Y2O3) ceramics didn't changed, while the crystallite size of ZrO2(MgO) ceramics decreased. The formation of block structure in all studied ceramics was observed, the sizes of the blocks formed in the ZrO2(Y2O3) and ZrO2(MgO) ceramics were slightly different. The formation of the blocks in ZrO2(Y2O3) ceramics occurred on the grain boundaries, while the crystallites in ZrO2(MgO) ceramics were crushed due to phase transformation.