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

被引：5

作者：

Zhao Wei-Wei ^{[1
,2
]}

Chen Xiao-Xin ^{[3
]}

Lin Chu-Cheng ^{[2
]}

Song Xue-Mei ^{[2
]}

Zeng Yi ^{[2
]}

Chang Cheng-Kang ^{[1
]}

机构：

[1] Shanghai Inst Technol, Sch Mat Sci & Engn, Shanghai 200235, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China

[3] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Peoples R China

来源：

JOURNAL OF INORGANIC MATERIALS | 2017年 / 32卷 / 11期

关键词：

zirconia ceramics; tetragonal phase; grain boundary; finite element method; BARRIER COATINGS; MICROSTRUCTURE;

D O I：

10.15541/jim20170046

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 images (EBSD) 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 center dot K) and 1.54 W/(m center dot K), respectively. The results reveal that the thermal conductivity of tetragonal phase is higher than that of the YSZ ceramic (2.31 W/(m center dot K)), while grain boundary's is lower than that of the YSZ ceramic.

引用

页码：1177 / 1180

页数：4

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