Corrosion products evolution and hot corrosion mechanisms of REPO4 (RE = Gd, Nd, La) in the presence of V2O5 + Na2SO4 molten salt

文献类型： 外文期刊

第一作者： Guo, Lei

作者： Guo, Lei;Zhang, Chenglong;Liu, Xichun;Ye, Fuxing;He, Qing;Li, Zhihua;Yu, Jianxing

作者机构：

关键词： Thermal barrier coatings; REPO4; 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： 2019 年 39 卷 4 期

页码：

收录情况： SCI

摘要： REPO4 (RE = Gd, Nd, La) ceramics with a monazite structure were fabricated by a chemical co-precipitation and calcination method. Hot corrosion tests were carried out in V2O5 + Na2SO4 molten salt at 800 degrees C, 900 degrees C and 1000 degrees C for 2 h and 10 h. The temperature and heat duration had little effect on the type of corrosion products in this study. However, GdPO4 and REPO4 (RE = Nd, La) revealed different hot corrosion behavior. Exposed to the molten salt, GdVO4 and Gd-4 (P2O7)(3) formed as the corrosion products for the GdPO4 case, while an RE(P,V)O-4 (RE = Nd, La) solid solution was generated for NdPO4 and LaPO4 cases. The formation of the solid solution had less damage to the original microstructure, which benefited the hot corrosion resistance of the ceramics. From the crystallographic characteristics of rare earth phosphates/vanadates and a thermodynamics perspective, the hot corrosion mechanisms of REPO4 (RE = Gd, Nd, La) are discussed.

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