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Preparation and Characterization of Self-Lubricating CaF2@ZrO2/YSZ Composite Coating

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Abstract

Core-shell CaF2@ZrO2 powders were prepared by sol method combined with centrifugal atomization drying, aiming at preventing CaF2 from burning during the APS deposition of YSZ-based abradable seal coating. The microstructure, chemical composition, hardness and wear behavior of the YSZ coating, the YSZ-10CaF2 coating and the YSZ-10CaF2@ZrO2 coating were comparatively investigated. The results suggested that the core-shell powders effectively protected CaF2, where the amount of CaF2 remained in the YSZ-10CaF2@ZrO2 coating was higher than that in the YSZ-10CaF2 coating. The YSZ coating had the highest average hardness of 97.3 HR45Y and exhibited a mixed wear mechanism of adhesive and fatigue wear with a friction coefficient of 0.23 and a volume wear rate of 7.28 mm3/N m. Contributed to soft and self-lubricating CaF2, the hardness of the YSZ-10CaF2 and YSZ-10CaF2@ZrO2 coatings slightly declined to 95.1 and 94.5 HR45Y correspondingly. The YSZ-10CaF2 coating showed a mixed wear mechanism of abrasive and fatigue wear with a friction coefficient of 0.14 and a volume wear rate of 4.67 mm3/N m. Moreover, the YSZ-10CaF2@ZrO2 coatings showed a mixed wear mechanism of reduced adhesive and fatigue wear with a friction coefficient of 0.10 and a volume wear rate of 2.66 mm3/N m.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant No. 52006159).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Xian Zeng, Yaqiong Xiong, Ziyong Liu, Xu Tong, Chengwei Hu, Jiatong Bian, Qian Cao & Xudong Cheng

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  1. Xian Zeng
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Zeng, X., Xiong, Y., Liu, Z. et al. Preparation and Characterization of Self-Lubricating CaF2@ZrO2/YSZ Composite Coating. J Therm Spray Tech 31, 2126–2135 (2022). https://doi.org/10.1007/s11666-022-01424-x

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