一种四元高熵（Er1/4Sc1/4Tm1/4Yb1/4）2SiO5单硅酸盐，具有低导热性和优异的抗CMAS腐蚀性能

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2025-06-09 DOI:10.1016/j.oceram.2025.100811

Sehreish Abrar, Faisal Nazeer

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引用次数: 0

摘要

CTE与sic基陶瓷复合材料相匹配，具有较低的导热系数和较好的抗钙镁铝硅酸盐（CMAS）腐蚀性能，是适合硅基陶瓷的热/环境阻隔涂层材料的基本要求。稀土硅酸盐具有较好的抗CMAS和水蒸气腐蚀性能，但其较高的导热系数和较高的CTE值限制了其应用。受高熵效应的启发，制备了新型（Er1/4Sc1/4Tm1/4Yb1/4）2SiO5或（4RE1/4）2SiO5单硅酸盐，以提高其整体性能。TEM分析表明，合成后的粉体混合均匀。由于晶格畸变和化学键的变化，合成的（4RE1/4）2SiO5单硅酸盐与sic基复合材料的CTE值为3 ~ 5.5 × 10-6 /K。（4RE1/4）2SiO5单硅酸盐的热导率值较低（1.2 W/m·K）。此外，季元（4RE1/4）2SiO5单硅酸盐在高温和长时间下也表现出更好的抗CMAS性能。总的来说，上述（4RE1/4）2SiO5单硅酸盐是用作T/EBC材料的合适候选者。

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A quaternary high entropy (Er1/4Sc1/4Tm1/4Yb1/4)2SiO5 monosilicate with low thermal conductivity and excellent resistance to CMAS corrosion

The matched CTE with SiC-based ceramics composites, low thermal conductivity and better corrosion resistance against calcium-magnesium-aluminosilicate (CMAS) are the basic requirements for suitable thermal/environmental barrier coating materials for silicon-based ceramics. Rare earth silicates have better corrosion resistance against CMAS and water vapor but their high thermal conductivity and higher value of CTE limit their applications. Inspired by the high entropy effect, a new quaternary (Er_1/4Sc_1/4Tm_1/4Yb_1/4)₂SiO₅ or (4RE_1/4)₂SiO₅ monosilicate was fabricated to improve the overall performance. The TEM analysis shows the uniform mixing of powders after synthesis. The as-synthesized (4RE_1/4)₂SiO₅ monosilicate shows a matched CTE value of 3 to 5.5 × 10^–6/K with SiC-based composites due to severe lattice distortion and chemical bonding variation. The point defects, including mass mismatch and oxygen vacancies, lead to a lower thermal conductivity value (1.2 W/m·K) of (4RE_1/4)₂SiO₅ monosilicate. Furthermore, the quaternary (4RE_1/4)₂SiO₅ monosilicate also shows better resistance against CMAS at high temperatures and for longer periods. Overall, the above (4RE_1/4)₂SiO₅ monosilicate is a suitable candidate to use as T/EBC material.

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