Dependence of the Mechanical Properties on the Microstructure of Carbon Fiber/Pitch Based Carbon Composites

Abstract

Carbon fiber/pitch based carbon composites were prepard, which of the matrices were of carbonized from fractionated pitchs (BS, BI/PS, PI), the mixtures of them and fractionated pitch with carbon blacks. Mechanical properties (strength, Young's modulus, fracture strain) of the compoistes were dependent on the microstructure of their matrices. Especially, it was revealed that the nature of matrix carbon has a significant role on the flexural strength of the composites. The composite with fine mosaic structure showed the largest fracture strength of all.