Abstract
The calcium magnesium aluminosilicate (CMAS) corrosion behavior of high entropy (La0.2Ce0.2Pr0.2Sm0.2Eu0.2)2Hf2O7 (HEF) thermal barrier coatings (TBCs) material heated at 1300 ℃ was first investigated. The results show that CMAS can quickly dissolve HEF, and then re-precipitate multicomponent apatite (Ap) solid solutions and HfO2 stabilized by rare earth (RE). Moreover, the re-precipitation rate of the Ap phase has a positive relation with RE cation size. The gradient re-precipitation of the Ap phase avoids the initiation of cracks in the reaction layer. It reveals that HEF exhibits good resistance to CMAS corrosion, which is regarded as a novel TBCs material.
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