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High entropy (Y1/5Ho1/5Er1/5Yb1/5Lu1 /5)3Al5O12 with low thermal conductivity and high thermal stability

Journal of Alloys and Compounds(2023)

引用 33|浏览17
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摘要
A novel single-phase high entropy (Y1/5Yb1/5Lu1/5Eu1/5Er1/5)3Al5O12 with uniform elemental distributions was prepared by hot-pressing and its thermophysical properties were comprehensively characterized in this study. The linear coefficient of thermal expansion is close to that of Al2O3. It has lower thermal con-ductivity than the single component counterparts Yb3Al5O12 and Y3Al5O12, which is attributed to enhanced phonon scattering due to the increased mass disorder. In particular, the corrosion resistance of (Y1/5Yb1/ 5Lu1/5Eu1/5Er1/5)3Al5O12 against water vapor is extremely high. The specific weight loss after constant temperature corrosion at 1400 degrees C for 30 h is only 0.2244 mg/cm2. All the results indicate that (Y1/5Ho1/5Er1/ 5Yb1/5Lu1/5)3Al5O12 is a promising candidate for thermal/environmental barrier coating material of Al2O3/ Al2O3 ceramic matrix composite. (c) 2023 Elsevier B.V. All rights reserved.
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关键词
Rare earth aluminate,High entropy ceramics,Thermal,environmental barrier coating,Water vapor,Thermophysical property
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