Abstract
An oxidation protective SiC-ZrB2-ZrSi2 coating with mosaic structure was designed to improve the oxidation resistance of carbon/carbon composites by a combined method of hydrothermal electrophoretic deposition and pack cementation. The phase composition, microstructure, thermal shock resistance and oxidation protective ability of the coating were investigated. Results show that the as-prepared SiC-ZrB2-ZrSi2 coating was dense and crack-free. After 50 thermal cycles between 1773 K and room temperature, the weight gain of the coated samples was 15.2 g m−2. The weight loss of the coated samples was only 15.6 g m−2 after oxidation in air at 1773 K for 580 h. The good thermal shock resistance and oxidation protective ability of the coated samples were attributed to the synergetic effect of the glass layer protection, compressive stress restraint and pinning role of ZrSiO4 inlaid phase.
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