Carbon-Carbon Composites Fabricated by Mesophase Injection and Stabilization

摘要

This study examines concepts of applying mesophase injection and oxidation stabilization to the fabrication of carboncarbon composites for aircraft brakes. The results show that it is feasible to inject low-viscosity mesophase pitch through a non-woven rigidized perform disk to retain flow-induced microstructures, and to stabilize the disk for carbonization by oxidizing at low temperatures that do not allow the flow structures to relax. Oxidation of the mesophase matrix at 170 °C is effective in retaining the flow-induced microstructures in 70 mm diameter disks for both first- and second cyle stabilization. Carbonization yields of stabilized disks are about 85% after heat treatment to 1150 °C. The density of 1.83 g/cm3 was measured in a specimen after three cycles of injection and stabilization.