Preparation, Microstructure and Thermal Conductivity of Plasma-Sprayed (Y0.8Gd0.2)(3)Al5O12 Coatings

文献类型： 外文期刊

第一作者： Wang, Shixing

作者： Wang, Shixing;Wang, Shixing;He, Jian;He, Jian;Xue, Zhaolu

作者机构：

关键词： thermal barrier coatings (TBCs); air plasma spraying (APS); (Y0.8Gd0.2)(3)Al5O12; phase stability; thermal conductivity

期刊名称：COATINGS （ 影响因子：3.236； 五年影响因子：3.312 ）

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年卷期： 2022 年 12 卷 4 期

页码：

收录情况： SCI

摘要： Garnet-type rare earth aluminate compounds are one class of promising potential candidate materials for thermal barrier coatings (TBCs). In this paper, (Y0.8Gd0.2)(3)Al5O12 (GYAG) coatings are fabricated by air plasma spraying, with the microstructure, high-temperature phase stability, and thermal conductivity investigated. The results showed that the as-deposited GYAG coating was relatively dense, and contained garnet-type (Y0.8Gd0.2)(3)Al5O12 phase and a small amount of (Y,Gd)AlO3 and amorphous phases. The crystallized GYAG coating exhibited good phase stability from room temperature to 1450 degrees C. The coating had the lowest thermal conductivity of 1.17 W.m(-1).K-1 at 800 degrees C, approximately 15% lower than that of the yttria-stabilized zirconia (YSZ) coating. After heat treatment at 1100 degrees C, the coating became denser with some fine grain precipitation, and formed a number of transverse and longitudinal cracks.

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