期刊
JOURNAL OF ADVANCED CERAMICS
卷 11, 期 4, 页码 615-628出版社
SPRINGER
DOI: 10.1007/s40145-021-0563-1
关键词
high-entropy oxides (HEOs); (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)(2)Ce2O7; defective fluorite structure; thermal expansion coefficient (TEC); thermal conductivity; thermal barrier coating (TBC)
资金
- Youth Innovation Promotion Association [2014378]
By designing and synthesizing high-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)(2)Ce2O7, the thermal expansion property of oxides is improved and the thermal conductivity is reduced. The multicomponent material has a higher thermal expansion coefficient and prominent thermal insulation behavior, and maintains phase stability at high temperatures, making it a promising TBC material.
High-entropy oxides (HEOs) are widely researched as potential materials for thermal barrier coatings (TBCs). However, the relatively low thermal expansion coefficient (TEC) of those materials severely restricts their practical application. In order to improve the poor thermal expansion property and further reduce the thermal conductivity, high-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)(2)Ce2O7 is designed and synthesized in this work. The as-prepared multicomponent material is formed in a simple disordered fluorite structure due to the high-entropy stabilization effect. Notably, it exhibits a much higher TEC of approximately 12.0 x 10(-6) K-1 compared with those of other high-entropy oxides reported in the field of TBCs. Besides, it presents prominent thermal insulation behavior with a low intrinsic thermal conductivity of 0.92 W.m(-1).K-1 at 1400 degrees C, which can be explained by the existence of high concentration oxygen vacancies and highly disordered arrangement of multicomponent cations in the unique high-entropy configuration. Through high-temperature in-situ X-ray diffraction (XRD) measurement, this material shows excellent phase stability up to 1400 degrees C. Benefiting from the solid solution strengthening effect, it shows a higher hardness of 8.72 GPa than the corresponding single component compounds. The superior thermo-physical performance above enables (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)(2)Ce2O7 a promising TBC material.
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