Microstructure and Properties of Air Plasma Sprayed Sm2Zr2O7 Coatings

doi:10.3724/SP.J.1077.2011.00696

Abstract

Abstract: Rare-earth zirconates with a pyrochlore structure have attracted great attention for potential application in thermal barrier coating systems. In the present work, Sm₂Zr₂O₇coatings were deposited by atmospheric plasma spraying technology. Their microstructure, thermo-physical and mechanical properties were examined, and compared with that of 8wt% Y₂O₃ stabilized ZrO₂coatings 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℃ 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.

Key words: plasma spraying, Sm₂Zr₂O₇coating, thermal conductivity, mechanical property

CLC Number:

TQ174

YU Jian-Hua, ZHAO Hua-Yu, ZHOU Xia-Ming, TAO Shun-Yan, DING Chuan-Xian. Microstructure and Properties of Air Plasma Sprayed Sm₂Zr₂O₇ Coatings[J]. Journal of Inorganic Materials, 2011, 26(7): 696-700.

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Microstructure and Properties of Air Plasma Sprayed Sm₂Zr₂O₇ Coatings

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