HIGH TEMPERATURE EROSION BEHAVIOR OF C/SiC COMPOSITE MANUFACTURED BY MELT SILICON INFILTRATION PROCESS

Abstract

The A raw C/C composite with a density of 1.40g/cm3 was used in order to investigate the high temperature erosion behavior and mechanical properties of liquid silicon infiltrated C/SiC composites. The microstructures of the as-received and infiltrated composites were examined with an optical (OM) and a scanning electron microscope (SEM). The volume fraction of residual silicon and porosity was measured by using an image analyzer. The flexural test for as-received as well as melt Si infiltrated C/C composites was performed to estimate the mechanical strength of the C/SiC composites. Severe fiber damage was occurred after infiltration. SiC was formed by reaction between carbon of fiber surface and molten Si . Flexural strength was decreased after melt Si infiltration and pull-out of fiber was observed at the fracture surface of as-received material.