PS-PVD Alumina Overlayer on Thermal Barrier Coatings Against CMAS Attack

文献类型： 外文期刊

第一作者： Guo, Yiqian

作者： Guo, Yiqian;Wei, Liangliang;Deng, Yangpi;He, Wenting;Guo, Hongbo;Guo, Yiqian;Wei, Liangliang;He, Wenting;Guo, Hongbo;He, Qing

作者机构：

关键词： alumina; atmospheric plasma spray (APS); calcium– magnesium– alumina– silicate (CMAS); plasma spray– physical vapor deposition (PS– PVD); thermal barrier coatings (TBCs); thermal cycling

期刊名称：JOURNAL OF THERMAL SPRAY TECHNOLOGY （ 影响因子：2.757； 五年影响因子：3.065 ）

ISSN： 1059-9630

年卷期： 2021 年 30 卷 4 期

页码：

收录情况： SCI

摘要： Glassy deposits mainly comprising of calcium-magnesium-alumina-silicate (CMAS) accelerate the spallation of thermal barrier coatings (TBCs). In this work, an Al2O3 layer was produced on yttria-stabilized zirconia (YSZ) coating by plasma spray-physical vapor deposition (PS-PVD). The effects of processing parameters during PS-PVD process on the microstructures of the deposited Al2O3 coatings were investigated. A homogeneous Al2O3 coating with porosity less than 1% was deposited at the spray distance of 1400 mm, which is much denser than the coating produced by atmospheric plasma spray (APS) and other PS-PVD coatings sprayed at 1000 and 1900 mm. The CMAS corrosion test at 1250 degrees C showed that the APS Al2O3 layer was dissolved in CMAS after 24 h thermal exposure, whereas a dense reaction layer mainly composed of anorthite formed on the top region of the PS-PVD Al2O3 layer effectively protected the underlying Al2O3 layer from CMAS infiltration. Thermal cycling behavior of the PS-PVD Al2O3/YSZ TBC and the APS Al2O3/YSZ TBC at 1050 degrees C was compared. Bulk spallation of the APS TBC occurred within 300 h thermal cycling, while little spallation was observed on the PS-PVD TBC even after 500 h thermal cycling, indicating superior durability of the PS-PVD coating.

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