Process for producing carbon fibers

Details Process for producing carbon fibers Process for producing carbon fibers

D - Textiles, Paper

01

F

18/9

D01F 9/22 (2006.01) D01F 9/14 (2006.01) D01F 9/32 (2006.01)

Patent

CA 1095206

ABSTRACT OF THE DISCLOSURE A process for continuously producing carbon fibers which comprises preoxidizing polyacrylonitrile fibers containing at least about 90% by weight of acrylonitrile at a temperature of about 200 to about 300°C in an oxidizing atmosphere while allowing the fibers to shrink about 40 to about 70% (of the free shrinkage of the fibers determined under a load of 1 mg/d) with the progress of preoxidation; then carbonizing the preoxi- dized fibers at about 500 to about 1,000°C in a non-oxidizing atmosphere so that the shrinkage of the fibers finally becomes about 40 to about 70% (of the free shrinkage of the preoxidized fibers determined when the fibers are placed under a load of 1 mg/d and heated at 1,000°C for 15 minutes); and then heat treating the carbonized fibers at constant length at a tempera- ture of up to about 3,000°C in a non-oxidizing atmosphere.

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