Calcium-magnesium-alumina-silicate(CMAS)resistant high entropy ceramic(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7) for thermal barrier coatings

作     者：Shuxiang Deng Gang He Zengchao Yang Jingxia Wang Jiangtao Li Lei Jiang Shuxiang Deng;Gang He;Zengchao Yang;Jingxia Wang;Jiangtao Li;Lei Jiang

作者机构：Key Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics EngineeringUniversity of the Chinese Academy of SciencesBeijing 100049China Key Laboratory of Bio-Inspired Materials and Interface SciencesTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第107卷第12期

页      面：259-265页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Key Research and Development Program of China(No.2016YFB070204) the National Natural Science Foundation of China(Nos.52072381 and U1904217) 

主　　题：High-entropy ceramic Pyrochlore structure Thermal barrier coating material CMAS resistance 

摘      要：A novel high-entropy material,(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7)was successfully synthesized by the solid state reaction method and spark plasma sintering,and investigated as a promising thermal barrier coating ***-earth elements were distributed homogeneously in the pyrochlore *** was found that the prepared high-entropy ceramic maintains pyrochlore structure at the temperature up to 1600℃,and it possesses a similar thermal expansion coefficient(10.2×10^(−6)K^(−1) at 25-900℃)to that of YSZ,low thermal conductivity(0.9 W m^(-1)K^(−1) at 100-1000℃)and good CMAS resistance(infiltration depth is 22μm after annealed at 1300℃for 24 h).The corrosion process was investigated,and RE elements distributing homogeneously in(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7)show different diffusion rates in ***^(3+) with a larger radius(closer to Ca^(2+))is easier to react with CMAS to form an apatite phase.