Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (4): 405-410.DOI: 10.15541/jim20200489

Special Issue: 【结构材料】热障与环境障涂层 【结构材料】高熵陶瓷

• RESEARCH PAPER • Previous Articles     Next Articles

Preparation and Thermophysical Properties of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7 High-entropy Ceramic

SANG Weiwei1,2(), ZHANG Hongsong2(), CHEN Huahui1, WEN Bin2, LI Xinchun2   

  1. 1. School of Mechanical Electronic & Information Engineering, China University of Mining & Technology-Beijing, Beijing 10083, China
    2. College of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, China
  • Received:2020-08-24 Revised:2020-10-05 Published:2021-04-20 Online:2020-10-30
  • Contact: ZHANG Hongsong, professor. E-mail:
  • About author:SANG Weiwei(1982-), female, PhD candidate, lecturer. E-mail:
  • Supported by:
    Henan Province University Scientific and Technological Innovation Team (18IRTSHN005); Key Project of Science and Technology Research at Henan Province Department of Education (20A5600008)


Developing novel ceramic materials with excellent thermophysical properties is one of the hotspots in the field of thermal barrier coatings. The (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7 high-entropy ceramic was fabricated via high-temperature solid-state reaction. The crystal structure, microstructure, phase stability and thermophysical properties were investigated. Results indicate that (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7 high-entropy ceramic has single defective fluorite structure, its elements are homogenously distributed, its grain size ranges from 0.2 to 3 μm. After high-temperature thermal cycling, the sample still remains single fluorite structure, showing excelleent phase stability at high temperature. Thermal conductivity lies in the range of 0.72-0.74 W/(m·K), lower than that of 7YSZ. Thermal expansion coefficient at 1200 ℃ is 5.6×10-6 K-1, lower than requirement of thermal barrier coatings (TBCs) for surface ceramic layer. However, its thermal expansion coefficient is close to that of the silicon-based ceramics substrate of environmental barrier coatings (EBCs) ((3.4-5.5)×10-6 K-1).

Key words: high-entropy ceramic, thermal-barrier coating, thermal conductivity, thermal expansion coefficient

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