High entropy (Y1/5Ho1/5Er1/5Yb1/5Lu1/5)3Al5O12 with low thermal conductivity and high thermal stability
Source abstract
Abstract
A novel single-phase high entropy (Y 1/5Yb 1/5Lu 1/5Eu 1/5Er 1/5) 3Al 5O 12 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 Al 2O 3 . It has lower thermal conductivity than the single component counterparts Yb 3Al 5O 12 and Y 3Al 5O 12 , which is attributed to enhanced phonon scattering due to the increased mass disorder. In particular, the corrosion resistance of (Y 1/5Yb 1/5Lu 1/5Eu 1/5Er 1/5) 3Al 5O 12 against water vapor is extremely high. The specific weight loss after constant temperature corrosion at 1400 ℃ for 30 h is only 0.2244 mg/cm 2. All the results indicate that (Y 1/5Ho 1/5Er 1/5Yb 1/5Lu 1/5) 3Al 5O 12 is a promising candidate for thermal/environmental barrier coating material of Al 2O 3/Al 2O 3 ceramic matrix composite.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · High Entropy Alloys Studies · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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