| 摘要 |
PURPOSE:Preoxidized fibers resulting from treating acrylonitrile synthetic fibers so that they reach a specific density are heat-treated in 2 stages under tension in an inert atmosphere, then the temperature is further raised and heat treatment is effected to produce the titled fibers of remarkably increased tensile strength. CONSTITUTION:Acrylonitrile synthetic fibers are preoxidized in a preoxidizer so that their density becomes 1.25-1.37g/cm<3>, then the resultant preoxidized fibers are heat treated at 300-500 deg.C under tension in an inert atmosphere, subsequently at 500-800 deg.C under increased tension in an inert atmosphere, and at over 800 deg.C in an inert atmosphere to give the objective carbon fibers.
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