Microstructure and property of SiC coating for carbon materials

SiC coating has been developed on four kinds of carbon substrates using a slurry-sintering method. The relationship between the microstructure and property of SiC coating and carbon substrates was investigated experimentally and theoretically. It was found that the pore radius of carbon substrates has marked effect on the microstructure and property of SiC coating. SiC gradient coating which is beneficial to improve the oxidation resistance for carbon materials, is expected to form on the surface of carbon substrate with the pore radius mainly over the range of 100–500 nm.