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Calcium-Magnesium-Aluminum-Silicate (CMAS) Corrosion Resistance of Y-Yb-Gd-Stabilized Zirconia Thermal Barrier Coatings

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Abstract

It was published that zirconate coatings containing Gd/Yb and yttria-stabilized zirconia (YSZ) coatings with high Y content had good calcium-magnesium-aluminum-silicate (CMAS) corrosion resistance. However, there are few reports on CMAS resistance of zirconia-based thermal barrier coatings (TBCs) doped with Y, Gd and Yb. This article intends to explore the role of Y, Gd and Yb in resisting CMAS corrosion of zirconia-based TBCs. The purpose is to optimize the rare earth modification of zirconia-based TBCs. 8YSZ and ZrO2-9.5Y2O3-5.6Yb2O3-5.2Gd2O3 free-standing TBCs were produced by air plasma spraying (APS) with commercial powders. The CMAS corrosion behavior and failure mechanism of these coatings were studied by heat treatment at 1350 °C. The microstructure and composition were characterized. The results showed the CMAS deposited on the surface of 8YSZ/YSZ-Yb-Gd coatings gradually penetrated into coatings. ZrSiO4 and m-ZrO2 were observed in the shallow layer of coatings. The diffusion rate of Y3+ in coatings into CMAS was greater than that of Gd3+ and Yb3+. Compared with YSZ coatings, CMAS penetrated deeper in YSZ-Yb-Gd coatings after the same corrosion time. The spallation of YSZ-Yb-Gd coatings occurred earlier than 8YSZ. In general, adding a small amount of Yb and Gd did not improve the CMAS resistance of YSZ TBCs.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (NSFC) under the Grant No. 51701235, Science and Technology Innovation of Shanghai under the Grant No. 18511108702, and National Science and Technology Major Project under the Grant No. 2017-VI-0010-0082.

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Authors and Affiliations

  1. The Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, People’s Republic of China

    Tongxin Wang, Fang Shao, **xing Ni, Huayu Zhao, Yin Zhuang, **g Sheng, **nghua Zhong, Jiasheng Yang, Shunyan Tao & Kai Yang

  2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Bei**g, 100049, People’s Republic of China

    Tongxin Wang, Fang Shao, **xing Ni, Huayu Zhao, Yin Zhuang, **g Sheng, **nghua Zhong, Jiasheng Yang, Shunyan Tao & Kai Yang

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  1. Tongxin Wang
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Wang, T., Shao, F., Ni, J. et al. Calcium-Magnesium-Aluminum-Silicate (CMAS) Corrosion Resistance of Y-Yb-Gd-Stabilized Zirconia Thermal Barrier Coatings. J Therm Spray Tech 30, 442–456 (2021). https://doi.org/10.1007/s11666-020-01142-2

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