Abstract
Unidirectional carbon-carbon composites have been made with type I carbon fibers surface treated with HNO 3 for different durations and phenolic, polyfurfuryl alcohol, and coal tar pitch as matrix precursors. It has been found that fiber-matrix bonding in polymer composites has great influence on the pyrolysis shrinkage, macrostructure, flexural strength and fracture behaviour of the final carboncarbon composites. The stronger the fiber-matrix bonding in polymer composites, the higher is the shrinkage of the composites during carbonisation and graphitisation and stronger are the fiber-matrix interactions in carbonised composites. Carbonised composites made with surface-treated carbon fibers, having strong fiber-matrix interactions, are found to fail catastrophically at low load. However, on graphitisation, these composites are found to exhibit increased mechanical properties with mixed mode fracture. These observations are found to hold true for all matrix precursors under study. Implications have been discussed.
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