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Microstructure and Properties of Air Plasma Sprayed Sm2Zr2O7 Coatings

Author(s): YU Jian-Hua, ZHAO Hua-Yu, ZHOU Xia-Ming, TAO Shun-Yan, DING Chuan-Xian

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 696;
Date: 2011;
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Keywords: plasma spraying; Sm2Zr2O7 coating; thermal conductivity; mechanical property

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¡æ is 0.44W/(mK), 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.

Tango Jona
Tangokurs Rapperswil-Jona

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