Mesophase behavior Fundamental to Processing of Carbon-Carbon Composites.

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1983
Accession Number
ADA160013

Entities

People

  • J. L. White
  • P. M. Sheaffer

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Carbon Carbon Composites
  • Carbon Fibers
  • Composite Material Fabrication
  • Composite Materials
  • Fabrication
  • Graphitic Materials
  • High Pressure
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Orientation (Direction)
  • Softening Point
  • Tars
  • Three Dimensional

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials