Effect of C/C Porous Preform on the Preparation and Properties of C/C-SiC Composites

Carbon fiber reinforced silicon carbide matrix(C/C-SiC)composites were prepared by precursor impregnation pyrolysis(PIP)process,using the four kinds of porous C/C composites with the same quasi-three dimensional needling preform but different pyrocarbon content filled by chemical vapor infiltration(CVI).The preparation and final performance of C/C-SiC composites have been investigated.The resullts show that the lower the density of C/C,the higher the open porosity and SiC matrix content of corresponding C/C-SiC.The existence of SiC matrix improves the bending strength of the C/C-SiC composite which was influenced significantly by the interfance of the fibers and matrix.The bending strength of the C/C-SiC composites produced of the C/C preform with the density of1.35g/cm3 is the highest with the excellent fibers-matrix adhesion.It was also shown that with the increase of the SiC matrix content,the anti-ablative property improves observably.