Effect of Microstructure on the Thermal Conductivity of Plasma-Sprayed Al2O3-YSZ Coatings

被引：23

作者：

Song, Xuemei ^{[1
]}

Liu, Ziwei ^{[1
]}

Kong, Mingguang ^{[2
]}

Wang, Yongzhe ^{[1
]}

Huang, Liping ^{[3
]}

Zheng, Xuebin ^{[3
]}

Zeng, Yi ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Coating Mat, Shanghai 200050, Peoples R China

来源：

JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2016年 / 25卷 / 04期

关键词：

Al2O3-YSZ coatings; atmospheric plasma spraying; microstructure; thermal conductivity; BARRIER COATINGS;

D O I：

10.1007/s11666-016-0389-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The microstructures of three atmospheric plasma-sprayed (APS) Al2O3-ZrO2 coatings were investigated using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The differences in the microstructures of the three Al2O3-ZrO2 coatings, including their phase compositions, cracks, pores, grain sizes, and solid solutions, were analyzed in detail. A close relationship was observed between the thermal conductivities of the coatings and the microstructures, and the Al2O3-YSZ coatings with more spherical pores, fewer vertical cracks, and finer grains exhibited the lowest thermal conductivity of 0.91 W/m center dot K. Compared with YSZ coatings, Al2O3-YSZ coatings can exhibit lower thermal conductivity, which may be attributed to the formation of an amorphous phase, smaller grains, and Al2O3-YSZ solid solution.

引用

页码：770 / 777

页数：8

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