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In order to develop cost effective carbon/carbon composites for general purpose applications, alternative reinforcements need to be tried to replace high modulus carbon fibers. Present studies deal with application of oxidised PAN fibers as reinforcement with char yielding phenolic resin and co-carbonisation of the composites. Polyacrylonitrile (PAN) fibers have been oxidised at 230°C for different...
This study provides microstructural information on changes in the carbon fiber surface as a function of heat-treatment temperature up to 900°C in air, for carbon/phenolic towpregs and composites, respectively, as made from carbon fiber tow and carbon fabric pre-coated with a 0.5 vol.% phosphoric acid solution in methanol. Thermogravimetric analysis and scanning electron microscopy were used. The...
The processing-structure-properties relationship of two-dimensional carbon/carbon (C/C) during the chemical vapor infiltration (CVI) process was investigated. The weight gain, density, porosity, flexural strength and flexural modulus of C/C composites were measured as a function of CVI processing time up to 72 hours. Three regions corresponding to different microstructures were observed in the CVI...
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