Journal of Materials Science

, Volume 7, Issue 6, pp 654–662 | Cite as

Impurity effects in carbon fibres

  • M. L. Lieberman
  • G. T. Noles
Papers

Abstract

Outgassing experiments have been performed on a variety of polyacrylonitrile- and rayon-based carbon yarns. Major residual impurities, as well as those introduced from surface treatments, have been identified. Sulphur has been shown to be a major impurity of rayon-based carbon fibres, with concentrations up to 3110 ppm by weight having been determined by neutron-activation analyses. Removal of this contaminant as a volatile material commences at approximately 1300° C. Interrelationships between sulphur removal and mechanical and crystallographic properties have been considered for one rayon-based carbon yarn. Decreases in both interlayer spacing and tensile strength are associated with sulphur evolution, whereas apparent crystallite size and Young's modulus are unaffected by the outgassing.

Keywords

Polymer Sulphur Tensile Strength Crystallite Size Carbon Fibre 

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Copyright information

© Chapman and Hall Ltd. 1972

Authors and Affiliations

  • M. L. Lieberman
    • 1
  • G. T. Noles
    • 1
  1. 1.Sandia LaboratoriesAlbuquerqueUSA

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