Oxidation behaviour of two-dimensional C/SiC modified with self-healing Si–B–C coating in static air

Different kinds of C/SiC modified with Si–B–C coating were fabricated and oxidised for 50 h in static air. Weight loss, residual strength and microstructure were analysed. The results indicate that Si–B–C ceramic as self-healing component has a remarkable effect on improving the oxidation resistance for C/SiC. C/SiC modified with Si–B–C ceramic as exterior coating has excellent residual mechanical property below 1000 °C. Meanwhile C/SiC with Si–B–C ceramic as intermediate coating exhibits better oxidation resistance above 1000 °C. Borosilicate glass formed from oxidation of Si–B–C ceramic, which seals cracks effectively in composites, is the reason for excellent oxidation resistance of C/SiC.

► C/SiC composites modified with self-healing Si–B–C coating have been developed. ► These self-healing composites exhibit excellent oxidation resistance below 1300 °C. ► Oxidation models for these composites have been presented. ► The results will be beneficial for applications for thermal-structure materials.