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and SiO 2 , which covers the surface of the composites and retards the oxygen diffusion and the attack on the underlying C/C substrate. For SiC coated C/C composites, the large SiC particles formed on the surface of the composites are difficult to oxidize rapidly and so a continuous and dense SiO 2 layer cannot be formed in time to significantly hinder fast oxygen diffusion leading to the consequent severe oxidation of the C/C substrate.

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induces an increase in the total surface free energy of the carbon fibers, and as a result the wettability of carbon fibers with molten Mg and Al is improved remarkably. TiC coating is found to be stable at 1000°C in molten Mg. However it is readily decomposed by the molten Al at high temperature, which brings about carbon fibers being attacked by the molten Al.and the consequent severe damage of carbon fibers.