Quantitative Calculation of Thermal Conductivity of Tetragonal Phase and Grain Boundary on Zirconia Ceramics

【Author】

ZHAO Wei-Wei;CHEN Xiao-Xin;LIN Chu-Cheng;SONG Xue-Mei;ZENG Yi;CHANG Cheng-Kang

【Institution】

School of Materials Science and Engineering, Shanghai Institute of Technology;Shanghai Institute of Ceramics, Chinese Academy of Sciences;School of Material Science and Engineering, Jiangsu University;Shanghai Institute of Ceramics, Chinese Academy of Sciences;Shanghai Institute of Ceramics, Chinese Academy of Sciences;Shanghai Institute of Ceramics, Chinese Academy of Sciences;School of Materials Science and Engineering, Shanghai Institute of Technology

【Abstract】

The yttria-stabilized zirconia (YSZ) coatings have been widely used as thermal barrier coatings (TBCs). In order to investigate the factors that influenced the thermal conductivity of TBCs, bulk YSZ ceramics with different grain sizes were prepared via hot-pressing sintering methods under different annealing conditions. The quantitative effects of the phase and the grain size on the thermal conductivity were analyzed. Based on electron backscatter diffraction (EBSD) images of YSZ ceramics, the distribution of grain boundaries and tetragonal phase were obtained. And thermal conductivities of grain boundaries and tetragonal phase were calculated by finite element models and Fourier’s equation. The thermal conductivities of grain boundaries and tetragonal phase are 2.65 W/(m·K) and 1.54 W/(m·K), respectively. The results reveal that the thermal conductivity of tetragonal phase is higher than that of the YSZ ceramic [2.31 W/(m·K)], while the thermal conductivity of grain boundary is lower than that of the YSZ ceramic.

【Keywords】

zirconia ceramics;tetragonal phase;grain boundary;thermal conductivity

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Total: 12 articles

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