Abstract
Carbon/carbon composites were made by pyrolysis of polymer composites composed of polyfurfuryl alcohol resin and different surface treated high modulus carbon fibres. Shrinkage during pyrolysis was found to be dependent on the fibre/matrix bonding in polymer composites, being maximum for strongly bonded composites with surface treated fibres. Surface finish on carbon fibres was also found to have an effect on the carbonization shrinkage of the composites. The flexural strength of the composites was found to change with pyrolysis temperature: decreasing up to 600°C, with an unusual change in strength above 600°C. Composites made with surface treated carbon fibres exhibit catastrophic failure with low ultimate strength, whereas, those made with non-surface treated carbon fibres fail in a mixed mode way resulting in high ultimate strength. Carbon/carbon composites made with surface finished (sized) carbon fibres exhibit higher flexural strength than those made with unsized carbon fibres.
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