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Unidirectional, pitch-based-matrix composites fabricated from PAN-based Courtaulds fibres were oxidised in air at temperatures of 420 and 730°C to low extents of burn-off (less than 3.5%). Material loss occurred primarily at fibre-matrix interfaces at the edge regions of the composites and, in the case of the lower temperature heat-treated materials, in the areas close to internal pores and cracks...
The final quality of carbon/carbon composite materials depends strongly on the tight fit of the components. This could be predicted with a better knowledge of the intrinsic thermal and mechanical behavior of the carbon fibers. With this object, we have built-up an experimental set-up for in situ studying of dimensional variations and the bending strain at failure of single filaments from high tensile...
Unidirectional composites were fabricated with fibers of different modulus (HT, IM, HM) and different surface treatments using various thermoplastics as the matrix. Mechanical properties were determined and correlated with the properties of the fibers. The interlaminar shear strength is shown to be controlled by the work of the adhesion as determined from contact angle measurements. Strong supporting...
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...
A spherulitic mesophase pitch with about 50 vol% mesophase has been synthesized by an iron-catalyzed pyrolysis of a coal tar pitch. The isotropic pitch is removed to various extents by solvent extraction. The thermoplasticity of the resulting raw mesophase powders is adjusted by treatment with oxygen with respect to optimum sintering properties. After milling of these powders to a particle sized...
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