Preparation of MoSi₂-SiC-Si Coatings for C_f/SiC Composites by in situ Reaction Method: Preparation of MoSi₂-SiC-Si Coatings for C_f/SiC Composites by in situ Reaction Method

A MoSi2-SiC-Si coating was prepared by in situ reaction method. The phase composition and microstructure of the coating were studied by using XRD,SEM and EDS analysis, and then the anti-oxidation property of the coating was investigated. The results show that the thickness of obtained coating is about 120 mu m, and the main phases are composed of MoSi2, SIC and Si. The MoSi2-SiC-Si coating has excellent anti-oxidation property, which can protect C-f/SiC composites from oxidation at 1500 degrees C in air for 96h, the weight loss of the coated samples is only 1.8%. The weight loss of the coated C-f/SiC composites samples is primarily due to the reaction of C-f/SIC composites substrate and oxygen diffusing through the penetration cracks in the coating.