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

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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 languageEnglish
Article number012029
JournalIOP Conference Series: Materials Science and Engineering
Volume156
Issue number1
DOIs
Publication statusPublished - 8 Nov 2016

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Thermal shock
Zirconia
Phase composition
Coherent scattering
Crystallite size
X ray scattering
Crystallites
Grain boundaries
Phase transitions
Temperature
Crystals
Microstructure
zirconium oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

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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.",
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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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