THERMAL CHARACTERIZATION OF PHENOL FORMALDEHYDE/NEEDLE PUNCHED CARBON COMPOSITES BY OXY-FLUORINATION TREATMENT

摘要

Carbon fiber reinforced carbon (C/C) composites have high thermal conductivity, excellent thermal stability, low coefficient of thermal expansion, resistance to thermal shock and ablation, and low density, high strength-to-weight ratio. These excellent properties enable C/C composites to be considered as potential materials for nozzles of solid rocket motor, heat shields for reentry vehicles, brake discs for advanced aircraft, and aerospace applications in leading edges and nose tips. When using C/C composites for these applications, increasing interfacial adhesion of a carbon precursor on carbon fiber surface in C/C composites is one of the methods to enhance thermal and mechanical properties of the composite. In this study, oxy-fluorination treatment of a carbon preform was carried out to improve the interfacial adhesion between a carbon precursor and a carbon preform and the effect of the treatment condition on thermal and mechanical properties of C/C composites were investigated.