Preparation and Oxidation Resistance of Self-Healing Coating for C/C Composite

For the aim of extending the application field of C/C composite as high temperature construction material, an oxidation protective coating with self-healing function for C/C composite was prepared, which mainly consisted of SiC and Si-B-Al-Cr-Zr based oxide ceramic. The mean oxidative mass loss of coated samples after isothermal tests in static and dry air from 700 DGC to 1000 DGC is about 2.91 x 10-7 ~ 9.43 x 10-6 g/(cm2*s), the coating has promised oxidation resistance under the temperature of 1 000 DGC. The oxidation rate decreases within 5 ~ 6 thermal cycles between 300 deg C and 1 000 deg C, and then increases after that, the mass loss of coated sample is 19.64% after 10 thermal cycles in 6 hours, the coating has thermal shock resistance in some extent. SiC combined B based ceramic coating can provide low mass loss and oxidation rate for coated C/C composite in long period oxidation and some thermal cycles.