PITCH-BASED CARBON FIBRES DERIVED FROM THERMOSET FIBRES OXIDIZED WITH CL-2 CONTAINING AIR

摘要

Mesophase pitch-based carbon fibres thermoset with Cl-2 containing air were studied for their microstructures and physical properties. Carbon fibres thermoset with Cl-2 containing air and heat-treated at 2000 degrees C (Cl(2)2000) possessed slightly smaller mean sizes of crystallites L(2)(002)s, lower densities, lower tensile moduli of elasticity, and higher tensile strengths than those thermoset with air. X-ray diffraction measurements revealed a somewhat lower degree of preferred orientation of a carbon fibre which was thermoset with Cl-2 containing air. The Cl-2 thermosetting partly disordered the periodic arrangement of crystallites and reduced the crystallite size L(2)(002) of a carbon fibre heat-treated at a lower temperature. A strong temperature dependence of resistivity was shown for Cl(2)800, suggesting much disorder in its microstructure due to the Cl-2 thermosetting, and Cl(2)1000 and Cl(2)1200, respectively showed specific temperature dependencies of resistivities. [References: 30]