Antioxidant treatment of carbon-carbon composite by means of chemical vapor reaction

Through chemical vapor reaction (CVR) method, namely infiltrating silicon vapor into pores of prefabricated part, then directly reacting with carbon to form silicon carbide at high temperature, the oxidation resistance of carbon-carbon composite with various initial density and prefabricated part structure can be improved. The density change and microstructure of carbon-carbon composite were studied, and the static oxidation tests of carbon-carbon composite is carried out. The results show that, with different CVR temperature and initial density of carbon-carbon composite, the density increment is significantly different after antioxidant treatment. The weight loss of needled carbon cloth C/C/SiC composite after oxidizing for 65 min at 1160°C in muffle is less than 2.6%, while weight loss of same-structure carbon-carbon composite with a density of 1.95 g/cm³ is up to 32% under the same test condition.