Authors
Zifan ZHAO, Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
Heng CHEN, Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Huimin XIANG, Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Fu-Zhi DAI, Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Xiaohui WANG, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Wei XU, Shanghai Chenhua Science and Technology Corporation Ltd., Shanghai 201804, China
Kuang SUN, Shanghai Chenhua Science and Technology Corporation Ltd., Shanghai 201804, China
Zhijian PENG, School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
Yanchun ZHOU, Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Keywords
high entropy ceramics, defective fluorite structure, rare-earth niobates/tantalates, thermal barrier coating material
Abstract
Rare-earth tantalates and niobates (RE3TaO7 and RE3NbO7) have been considered as promising candidate thermal barrier coating (TBC) materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia (YSZ). However, the low Vickers hardness and toughness are the main shortcomings of RE3TaO7 and RE3NbO7 that limit their applications as TBC materials. To increase the hardness, high entropy (Y1/3Yb1/3Er1/3)3TaO7, (Y1/3Yb1/3Er1/3)3NbO7, and (Sm1/6Eu1/6Y1/6Yb1/6Lu1/6Er1/6)3(Nb1/2Ta1/2)O7 are designed and synthesized in this study. These high entropy ceramics exhibit high Vickers hardness (10.9-12.0 GPa), close thermal expansion coefficients to that of single-principal-component RE3TaO7 and RE3NbO7 (7.9×10-6-10.8×10-6 ℃-1 at room temperature), good phase stability, and good chemical compatibility with thermally grown Al2O3, which make them promising for applications as candidate TBC materials.
Publisher
Tsinghua University Press
Recommended Citation
Zifan ZHAO, Heng CHEN, Huimin XIANG et al. High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications. Journal of Advanced Ceramics 2020, 9(3): 303-311.
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