The oxidation resistance mechanism of silica-based ceramic materials is the synthesis of silica-based ceramic compound coating on the surface of CFC.

Silicide in silica-based ceramic materials reacts with oxygen to form SiO, which fills cracks and other defects in the CFC coating on the one hand, and acts as a sealing substance to block oxygen infiltration on the other hand.

Because the oxygen diffusion coefficient of SiO₂ is very low [10^-13g/(cm˙s) at 1200℃, 10^-11g/(cm˙s) at 2200℃], it can effectively provide oxidation protection for CFC.

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