Process for producing carbon fibers

Details Process for producing carbon fibers Process for producing carbon fibers

1976-04-06

1978-01-17

Vertiz, O. R.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234477, D01F 912

Patent

active

040692973

ABSTRACT:
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.degree. to about 300.degree. 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 preoxidized fibers at about 500.degree. to about 1,000.degree. 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.degree. C for 15 minutes); and then heat treating the carbonized fibers at constant length at a temperature of up to about 3,000.degree. C in a non-oxidizing atmosphere.

REFERENCES:
patent: 3529934 (1970-09-01), Shindo
patent: 3552923 (1971-01-01), Carpenter et al.
patent: 3556729 (1971-01-01), Holsten et al.
patent: 3705236 (1972-12-01), Ishikawa et al.
patent: 3764662 (1973-10-01), Roberts, Jr.
patent: 3900556 (1975-08-01), Clarke
patent: 3914394 (1975-10-01), Fukushima et al.
patent: 3914960 (1975-10-01), McGuffin et al.
patent: 3933986 (1976-01-01), Matsumura et al.
patent: 3935301 (1976-01-01), Morita et al.
patent: 3954950 (1976-05-01), Ram et al.

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