Abstract: SiC was coated on the surfaee of Carbon-Carbon composites prepared from the PAN carbon-cloth and pitch. CH4 and SiCl4 are used as raw material,N,as carrying gas for SiCl4 and H2 as dilution gas.CVD SiC coating is prepared with two kinds of ratio and three kinds of temperature.The main elements of coating are C, Si, Cl and traeed Ca from electronic probe,SEM observation revealed that, when the C content is 62%,the mornhology of SIC ap-pearance is cauliflower o:in cloud mass with poor oxidation resistance,and while C / Si ratio tends to l,the surfaee morphology is pineapple with increased oxidation resistanee. In addition,when the deposited temperature increases,the size of surfaee pellet becomes larger.

Key words: silicon carbides, coatings, carbon-carbon composites, composition, morphology