C/C Compositeの曲げ破壊特性

Objective of this paper is to reveal characteristics of bending fracture in C/C composites with two types of the reinforcement (T300 produced by Toray and HTA by Toho Rayon, both PAN based high-strength type carbon fiber). Satin weave carbon fabric/carbon matrix laminates were fabricated, for which CFRP laminates were prepared with the hot press molding and then carbonized at about 1000°C.Both fibers have nearly the same mechanical properties. First of all, change of laminates thickness was investigated before and after the carbonization process. Three-point bending tests were carried out using the specimens with various span/thickness ratios. Fracture surfaces and crack-propagation behaviors were characterized with a SEM.