Enhanced oxidation resistance of carbon fiber reinforced lithium aluminosilicate composites by boron doping

Carbon fiber reinforced lithium aluminosilicate matrix composites (Cf/LAS) modified with boron doping were fabricated and oxidized for 1 h in static air. Weight loss, residual strength and microstructure were analyzed. The results indicate that boron doping has a remarkable effect on improving the oxidation resistance for Cf/LAS. The synergism of low viscosity of LAS matrix at high temperature and formation of graphite crystals on the surface of carbon fibers, is responsible for excellent oxidation resistance of the boron doped Cf/LAS.