Two composite materials, CC and CC-SiC, were prepared by liquid pitch infiltration-carbonization cycles; required SiC weight percentage was determined by TGA. Morphological structures of CC and CC-SiC composites were evaluated using PLM and SEM. Weight loss at oxy-acetylene flame was observed on both composites during 5, 10 and 15 minutes, respectively. CC and CC-SiC weight values decreased with the increasing of flame exposure time; morphological changes were induced during flame exposure. Excessive carbon on the matrix was oxidized forming CO, and volatile substances were released, generating a porous structure on the composites. However, for CC-SiC composite, the reinforcement integrity was remained, verifying the effect of SiC on the composites behavior at high temperatures.