Compositional design guidance for multi-principal element monosilicates for obtaining excellent corrosion resistance

作者：Zeyu Chen, Yiling Huang, Peng Fan, Chucheng Lin, Wei Zheng, Xuemei Song, Yaran Niu, Yi Zeng · 发表于：Cell Reports Physical Science · 年份：2024 · DOI：10.1016/j.xcrp.2024.102317 · 被引用次数：8 · 研究领域：Advanced ceramic materials synthesis、Intermetallics and Advanced Alloy Properties、Pigment Synthesis and Properties

Rare earth monosilicate (RE 2 SiO 5 ) is an ideal material for protecting ceramic matrix composites (CMCs) against corrosion in environmental barrier coatings (EBCs). Doping multi-principal rare earth elements (REEs) into RE 2 SiO 5 to optimize multifunctional properties represents a strategy in EBC design. However, achieving excellent corrosion resistance against calcium-magnesium aluminosilicate (CMAS) molten salt remains challenging due to the drastic degradation of corrosion resistance at specific temperatures caused by inappropriate REE combinations. In this study, 22 types of monosilicates were fabricated to investigate CMAS corrosion resistance. The results indicate that corrosion resistance is influenced by the ionic radii of the doped REEs, impacting both thermodynamic and kinetic corrosion behaviors. The kinetic factors are particularly exacerbated at higher temperatures. Here, we report a descriptor, the weighted average RE 3+ radius, which is proposed to describe the solid solution of REEs in RE 2 SiO 5 , offering practical guidance for designing compositions that predict optimal corrosion resistance across different temperature ranges.