SiCn/SiC oxidation protective coating for carbon/carbon composites

Nano-SiC (SiCn) coating was deposited on SiC pre-coated C/C composites by a hydrothermal electrophoretic deposition. The phase compositions, surface and cross-section microstructures, and anti-oxidation properties of the multilayer coatings were investigated. Results show that hydrothermal electrophoretic deposition is an effective route to prepare smooth and homogeneous SiCn coating on SiC–C/C composites. The as-prepared SiCn/SiC multilayer coatings can effectively protect C/C composites from oxidation in air at 1773 K for 202 h with a weight loss of 0.79% and at 1873 K for 64 h with a weight loss of 1.3%.