Microstructure and Properties of Air Plasma Sprayed Sm2Zr2O7 Coatings

被引：5

作者：

Yu Jian-Hua ^{[1
,2
]}

Zhao Hua-Yu ^{[1
,2
]}

Zhou Xia-Ming ^{[1
,2
]}

Tao Shun-Yan ^{[1
,2
]}

Ding Chuan-Xian ^{[1
,2
]}

机构：

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

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

来源：

JOURNAL OF INORGANIC MATERIALS | 2011年 / 26卷 / 07期

关键词：

plasma spraying; Sm2Zr2O7; coating; thermal conductivity; mechanical property; THERMAL-CONDUCTIVITY;

D O I：

10.3724/SP.J.1077.2011.00696

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：

Rare-earth zirconates with a pyrochlore structure have attracted great attention for potential application in thermal barrier coating systems. In the present work, Sm2Zr2O7 coatings were deposited by atmospheric plasma spraying technology. Their microstructure, thermo-physical and mechanical properties were examined, and compared with that of 8wt% Y2O3 stabilized ZrO2 coatings which was deposited under the same plasma spraying conditions. X-ray diffraction result shows that the as-sprayed Sm2Zr2O7 coating exhibits a defective fluorite structure. The thermal conductivity of Sm2Zr2O7 coating measured at 800 degrees C is 0.44W/(m.K),about 40% lower than that of 8wt% Y2O3 stabilized ZrO2 coating, but the expansion coefficients of both coatings are similar. The Sm2Zr2O7 coating exhibits lower bending strength, microhardness and elastic modulus compared with 8wt% Y2O3 stabilized ZrO2 coating.

引用

页码：696 / 700

页数：5

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