Microstructure of pitch fiber-phenolic/CVI matrix carbon-carbon composite

Conventional and polarized light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to examine the microstructure of a two-dimensional mesophase pitch fiber, phenolic resin char plus chemical vapor infiltrated (CVI) matrix carbon-carbon composite. Optical and SEM results indicate that the pitch fiber bundles are bonded by interbundle resin char. Each individual fiber within a bundle is surrounded...