Microstructure evolution and hot corrosion mechanisms of Ba2REAlO5 (RE = Yb, Er, Dy) exposed to V2O5 + Na2SO4 molten salt

文献类型： 外文期刊

第一作者： Guo, Lei

作者： Guo, Lei;Zhang, Chenglong;Yan, Zheng;Ye, Fuxing;He, Qing;Yu, Jianxing;Dan, Chengyi;Ji, Vincent

作者机构：

关键词： Thermal barrier coatings; Ba2REAlO5; Hot corrosion; V2O5 + Na2SO4

期刊名称：JOURNAL OF THE EUROPEAN CERAMIC SOCIETY （ 影响因子：5.302； 五年影响因子：4.925 ）

ISSN： 0955-2219

年卷期： 2018 年 38 卷 10 期

页码：

收录情况： SCI

摘要： Ba2REAlO5 (RE = Dy, Er, Yb) powders were synthesized by a solid state reaction method, followed by cold pressing and sintering to produce pellets for hot corrosion tests. When exposed to V2O5 + Na2SO4 molten salt at 900 degrees C and 1000 degrees C for 4h and 20 h, REVO4, Ba-3(VO4) (2) and BaAl2O4 formed as corrosion products due to chemical interactions between the ceramics and the molten salt, which were temperature and time independent. After the hot corrosion tests at 1000 degrees C, continuous, dense reaction layers with a thickness of similar to 80 mu m formed on the sample surfaces, which had an effective function on suppressing further penetration of the molten salt. The hot corrosion mechanisms of Ba2REAlO5 are proposed based on Lewis acid-base rule, phase diagrams and thermodynamics. From a thermodynamics perspective, the molten salt directly reacting with Ba2REAlO5 is difficult compared with Yb2O3, Al2O3 and BaO.

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