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

Abstract

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-ZrO₂ and cubic c-ZrO₂ modifications and rising the content of low-temperature monoclinic m-ZrO₂ crystal 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.

Original language	English
Article number	012029
Journal	IOP Conference Series: Materials Science and Engineering
Volume	156
Issue number	1
DOIs	https://doi.org/10.1088/1757-899X/156/1/012029
Publication status	Published - 8 Nov 2016

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)

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10.1088/1757-899X/156/1/012029

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title = "Effects of transient thermal shock loadings on the structure of zirconia ceramics",

abstract = "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-ZrO2 and cubic c-ZrO2 modifications and rising the content of low-temperature monoclinic m-ZrO2 crystal 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.",

author = "Derkach, {E. A.} and Buyakova, {S. P.} and Kul'kov, {Sergey Nikolaevich}",

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AU - Derkach, E. A.

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AU - Kul'kov, Sergey Nikolaevich

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N2 - 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-ZrO2 and cubic c-ZrO2 modifications and rising the content of low-temperature monoclinic m-ZrO2 crystal 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.

AB - 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-ZrO2 and cubic c-ZrO2 modifications and rising the content of low-temperature monoclinic m-ZrO2 crystal 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.

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