Research progress on silicon carbide and its modified coatings in C/SiC composites

Carbon fiber reinforced silicon carbide ceramic composite (C/SiC) has become a key structural material due to its excellent high temperature resistance, corrosion resistance and oxidation resistance. However, C/SiC composites are prone to oxidation under long-term high temperature loading conditions. In this work, the research progress of SiC coating and its modified coating on the surface of C/SiC composite is reviewed. The optimization of these coatings mainly involves two aspects: structure and composition. The focus of structural optimization is to improve the interphase structure by such as SiC nanowires, thereby improving the interfacial bonding strength between the coatings and between the coatings and the substrate. The focus of composition optimization is to improve the performance of the coatings under high temperature loads by rare earth silicates, etc. The modification strategies of various modified coatings are emphatically introduced, which is helpful to guide the preparation of high-performance C/SiC coating materials in the future.