Qualitative and quantitative microstructure study of the unidirectional carbon fibre reinforced carbon composites

Qualitative and quantitative analyses of two types of unidirectional carbon -carbon composites together with fractographic investigation and room tempe rature bending strength measurements were performed. Methodical aspects of the quantitative estimation of microstructure parameters were discussed. Th e reliability of the performed image analysis was judged. The effect of the rmal treatment at 2200 degreesC (graphitization) on microstructure and mech anical properties of the composites was pursued. The positive influence of using the high modulus fibres and of the performed heat treatment on bendin g strength and toughness of the investigated materials was confirmed.