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Unidirectional (UD) composites, fabricated with surface-oxidized HT carbon fibers (Magnamite AS4, Hercules) and with two mesogenic pitches and two mesophase pitches, were stabilized at 1 MPa oxygen pressure and 200°C to various amounts of oxygen uptake, carbonized and graphitization-treated at 2100°C. Dimensional changes and bulk densities of the composites, carbon yields of the matrix, and mechanical...
The stabilization of unidirectional (UD) composites fabricated with non-surface-oxidized and surface-oxidized HT carbon fibers, mesogenic pitches and mesophase pitches with oxygen was studied by variation of oxygen pressure (up to 2 MPa), temperature (160-200°C), and stabilization time (up to 36 hours). The oxygen uptake is diffusion controlled and can be described by Fick's second law. By stabilization,...
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