Effect of the Ratio of CVI-C/IC-C on the Flexural Strength of C-C/SiC Composites
Needling carbon fiber is used as the boby,resin impregnation and chemical vapor deposition were mixed in preparing C/C porous body of the same density.C/C-SiC composites were prepared using melt silicon infiltration.The effect of the ratio of CVI-C/IC-C on the microstructure and bending properties was studied.The results reveal that as the content of pyrolytic carbon coating increases,the density and bending strength of the C/C-SiC composites first increase and then decrease.The optimal den-sity and bending strength were achieved when the ratio of pyrolytic carbon to resin carbon was 1∶1,resulting in a density of 2.03 g/cm3 and a bending strength of 240 MPa.
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