Exploring superior calcium-magnesium-aluminosilicate (CMAS) corrosion resistance is crucial for high-entropy rare-earth monosilicates (HEREMs) as the next-generation environmental barrier coating (EBC) materials. However, related studies are rarely reported. This work presents the exploration of HEREMs with remarkable CMAS corrosion resistance by engineering their compositions. The equimolar 3-to-9 cation high-entropy rare-earth monosilicate (3-9HEREM) specimens were initially prepared using a pressure-less sintering technique; subsequently, their resistance to CMAS corrosion was evaluated at temperatures up to 1,600 °C. The results demonstrate that the 5HEREM specimens possess the best CMAS corrosion resistance among all the as-fabricated specimens, surpassing other reported EBC materials. Such remarkable CMAS corrosion resistance results from the generation of a dense apatite protective layer originating from its low dissolution rate at elevated temperatures.

中文翻译：

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高熵稀土单硅酸盐的成分工程可实现卓越的 CMAS 耐腐蚀性


探索卓越的钙-镁-铝硅酸盐 （CMAS） 耐腐蚀性对于作为下一代环境阻隔涂层 （EBC） 材料的高熵稀土单硅酸盐 （HEREM） 至关重要。然而，相关研究很少报道。这项工作通过工程化其成分，探索了具有显著 CMAS 耐腐蚀性的 HEREMs。等摩尔 3 至 9 阳离子高熵稀土单硅酸盐 （3-9HEREM） 样品最初使用无压烧结技术制备;随后，在高达 1,600 °C 的温度下评估了它们的抗 CMAS 腐蚀能力。 结果表明，5HEREM 试件在所有预制试件中具有最佳的 CMAS 耐腐蚀性，优于其他已报道的 EBC 材料。如此出色的 CMAS 耐腐蚀性是由于在高温下的低溶解速率而产生了致密的磷灰石保护层。