Carbon fiber production

Details Carbon fiber production Carbon fiber production

1983-08-05

1986-03-18

Dixon, Jr., William R.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234474, 4234476, 4234472, 264 292, 2421181, 24211832, D01F 912

Patent

active

045768102

ABSTRACT:
The oxidation of carbon fibers from pitch is carried out directly by winding the spun fibers on to a spinning spool or bobbin, said spool comprising an open ended, porous, non-expanding or collapsible spool. The spun carbon fibers are wound on such a spinning spool so as to leave open areas between fiber bundles. A mixture of an inert gas such as air or nitrogen containing a minor amount of oxygen is used as the oxidizing gas. Oxidation is carried out in a closed zone, e.g. an oven, for a period of time of at least 4 hours at a temperature that is initially below the glass transistion temperature of the carbon fibers and is slowly increased over the oxidation time to a maximum of about 340.degree. C. The gaseous oxidation atmosphere is continuously recycled and passed through the spool to ensure that the fibers are essentially completely oxidized.

REFERENCES:
patent: 3664900 (1972-05-01), Cuckson et al.
patent: 3826611 (1974-07-01), Stuetz
patent: 3833182 (1974-09-01), Wilcox et al.
patent: 3871601 (1975-03-01), Crawford et al.
patent: 4193252 (1980-03-01), Shepherd et al.
patent: 4335089 (1982-06-01), Maruyama et al.
patent: 4351816 (1982-09-01), Schulz

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