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Effect of Thermal Aging on Microstructure and Mechanical Properties of Plasma-Sprayed Samarium Zirconate Coatings

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Abstract

The rare-earth zirconates with the general formula of Ln2Zr2O7 (Ln = rare-earth elements) having considerable low thermal conductivity and exhibiting good phase stability at high temperature have attracted particular interest in thermal barrier coating (TBC) applications. The Sm2Zr2O7 coatings were deposited by plasma spraying, and the effect of thermal aging on their microstructure and mechanical properties was examined. The lamellar structure gradually disappeared with the temperature increasing for thermal aging. The evaluation by image analysis revealed that the amount of microcrack in coatings decreased with increasing aging temperature because of the increase in aspect ratio caused by microcrack healing, while no obvious change was observed in the spherical porosity. The as-sprayed Sm2Zr2O7 coating exhibited low microhardness and elastic modulus, which increased with rise in aging temperature because of the microstructure reconfiguration; in addition, the ratio of microhardness to elastic modulus decreased with aging temperature increase, indicating a promotion in plastic property.

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Authors and Affiliations

  1. Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai, 200050, China

    Jianhua Yu, Huayu Zhao, Xiaming Zhou, Shunyan Tao & Chuanxian Ding

  2. Shanghai Institute of Ceramic, Chinese Academy of Sciences, Shanghai, 200050, China

    Jianhua Yu, Huayu Zhao, Xiaming Zhou, Shunyan Tao & Chuanxian Ding

  3. Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China

    Jianhua Yu

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  1. Jianhua Yu
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  2. Huayu Zhao
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  3. Xiaming Zhou
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  5. Chuanxian Ding
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Correspondence to Shunyan Tao.

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Yu, J., Zhao, H., Zhou, X. et al. Effect of Thermal Aging on Microstructure and Mechanical Properties of Plasma-Sprayed Samarium Zirconate Coatings. J Therm Spray Tech 20, 1056–1062 (2011). https://doi.org/10.1007/s11666-011-9658-5

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  • DOI: https://doi.org/10.1007/s11666-011-9658-5

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