Preparation and Microstructure Analysis of C/C Composites with Multi-coupling Fields CVI

With liquified petroleum gas as hydrocarbon,carbon felt as porous preform,C/C composites were fast fabricated by multi-coupling felds CVI process.C/C composites with density more than 1.7 g.cm~(-3) were obtained with lower 650℃in one cycle within 15h,and pyrocarbon microstructures were investigated with a polarized light microscope (PLM).At the same time, densification process and deposition mechanism of pyrocarbon were discussed.The results show that the density is uniform,and there is existing pyrocarbon with rough laminar(RL),smooth laminar(SL) and banded structure in the same sample.