Influence of heat treatment on oxidation properties of C/C composites fabricated by high pressure impregnation carbonization

Felt base carbon/carbon composites fabricated by super-high pressure impregnation carbonization process (SPIC) were heat treated at high temperature 2773 K, The oxidation properties of felt base carbon/carbon composites were investigated at different temperatures (773-1173 K), and the microstructures of carbon/carbon composites were studied by SEM and X-ray diffraction. The experimental results showed that the interlaminar distance of (002) plane (d₀₀₂) decreased while the microcrystalline stack height (L_c) increased. The oxidation rate of felt base carbon/carbon composites was invariable at certain temperatures. The oxidation mechanism of carbon/carbon composites changed remarkably at the oxidation temperature 973 K. At the initial oxidation stage of carbon/carbon composites, carbon matrix was oxidized much more rapidly than carbon felt.