CMAS corrosion behavior of a novel high entropy (Nd0.2Gd0.2Y0.2Er0.2Yb0 .2)2Zr2O7 thermal barrier coating materials
CORROSION SCIENCE(2023)
摘要
The CMAS corrosion behavior of a novel high entropy material (Nd0.2Gd0.2Y0.2Er0.2Yb0.2)(2)Zr2O7 with thermal conductivity of 1.215 W center dot m(-1)center dot K-1 was investigated. Results show that a dense layer composed of apatite type RE8Ca2(SiO4)(6)O-2 phase and RE/Ca-ZrO2 forms in front of the reaction layer, which dramatically decreases the infiltration rate of CMAS from 20 to 5.3 mu m/h at 1300 degrees C. Moreover, the elements with a larger ion radius are easier to form apatite type phase to slow down the further infiltration of CMAS. This study reveals that the high entropy (Nd0.2Gd0.2Y0.2Er0.2Yb0.2)(2)Zr2O7 ceramic is a promising candidate for TBCs with extreme resistance to CMAS corrosion.
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关键词
Thermal barrier coatings, Rare earth zirconate, Fluorite structure, High entropy, CMAS corrosion, High temperature
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