Effect of the Open Porosity on the Flexural Strength of 2-D Woven Carbon Fiber Reinforced SiC/C Matrix Composites by Reaction-Bonding

摘要

Plane woven fabric carbon fiber-reinforced SiC/C matrix composites were fabricated by the reaction bonding method with phenolic resin and silicon powder. Densification of the composites was accomplished by the impregnation & pyrolysis of phenolic resin. The influence of the open porosity of the SiC/C matrix composites on the flexural strength was compared with that of the C matrix composites fabricated with phenolic resin and graphite powder. The effect of the open porosity upon the flexural strength was different between SiC/C and C matrix. The flexural strength of SiC/C matrix composites with the open porosity of ～ 15% was ～ 300 MPa, however, that of C matrix composites with the open porosity of ～ 12% was only ～ 240 MPa. Further, the mechanical properties of SiC/C matrix composites greatly depended on the heat treatment temperatures before impregnation of phenolic resin.