Mesophase behavior Fundamental to Processing of Carbon-Carbon Composites.
Interim technical rept. 1 Oct 82-30 Sep 83,
AEROSPACE CORP EL SEGUNDO CA MATERIALS SCIENCES LAB
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The behavior of the carbonaceous mesophase under composite-fabrication conditions is being investigated to ascertain 1 how microstructure forms within the fiber matrix, 2 which mechanisms determine process efficiency, and 3 the ways in which carbonizing and graphitizing heat treatments affect matrix properties. This second annual report summarizes microstructural findings on impregnated fiber bundles quenched from various states of pyrolysis and describes the application of a penetrometric test to determine the pyrolysis conditions required to harden the mesophase. Also described are methods of extrusion and draw to prepare mesophase rods of well-defined microstructure, which are required to study the effects of heat treatment on dimensions, thermal expansivity, and the mechanical properties of the mesophase microconstituents in the composite. Originator supplied keywords include Carbon fiber, Petroleum pitch, Coal-tar pitch, Wetting, Disclination, Liquid crystal.
- Laminates and Composite Materials