Enhanced water-oxygen corrosion resistance of SiC/SiC composites at 1350 °C via a single-layer Y-Al-Si-O glass-ceramics environmental barrier coating

This study introduces a novel approach for modifying CVI-SiC/SiC composites and constructing EBCs devoid of silicon bonding layers. The introduction of Y-Al-Si-O(YAS) system microcrystalline glass as a matrix modifier significantly reduces the preparation time for SiC/SiC composites, concurrently improving the corrosion resistance of the matrix. Subsequent preparation of monolayer YAS EBCs on a modified substrate provides excellent high-temperature corrosion resistance. Following 100 hours of water-oxygen corrosion at 1350 degrees C, SiO 2 thermal growth oxide(TGO), approximately 1 mu m thick, was observed within the composites. Moreover, the mechanical properties of the coated composites remain virtually unaltered after 100 hours of corrosion.