Fabrication of Carbon Fiber/SiSiC Composites and Their Mechanical Properties

摘要

A carbon woven fabric (≈55 vol)/carbon and a chopped carbon fiber (≈40 vol)/carbon preforms were reactionbonded with a silicon melt at 1700 deg C in a vacuum to fabricate dense carbon fiber/SiSiC composites. The carbon woven fabric/carbon with the density of 1.6 g/cm~3 (3-pt bending strength of 50 MPa and work of fracture of 987 J/m~2 ) were converted to a carbon woven fabric/SiSiC which showed the values of 1.9 g/cm~3, 112 MPa and 1390J/m~2, respectively. In the case of the transition of chopped fiber/carbon to the carbon fiber/SiSiC, the density was increased significantly from 1.15 g/cm~3s to 1.9 g/cm~3. This work showed that a one-step reaction-bonding process for the carbon fiber composites increased the density and mechanical properties significantly.