Production of high tenacity graphitic fibrous materials

Details Production of high tenacity graphitic fibrous materials Production of high tenacity graphitic fibrous materials

1973-04-25

1976-05-04

Woo, Jay H.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

264 29, C01B 3107

Patent

active

039549500

ABSTRACT:
A process is provided for the efficient conversion of acrylonitrile homopolymer fibrous materials and closely related acrylonitrile copolymer fibrous materials to graphitic fibrous materials of high tenacity. The process incorporates an initial brief fiber healing step which is conducted at a temperature of about 170.degree. to 220.degree.C., a preoxidation step, and a tandem carbonization/graphitization step as described. The relationship of the various variables required to produce the high tenacity graphitic fibrous product is set forth in the equation provided. In a preferred embodiment of the invention the carbonization/graphitization step of the process is conducted on a reliable and stable basis wherein the desired tenacity is achieved without the necessity of resorting to the exertion of high longitudinal tensions upon the preoxidized acrylic fibrous material.

REFERENCES:
patent: 3539295 (1970-11-01), Ram
patent: 3647770 (1972-03-01), Gump et al.
patent: 3677705 (1972-07-01), Ram et al.
patent: 3708326 (1973-01-01), Chenexey et al.
patent: 3708326 (1973-01-01), Chenexey et al.
patent: 3729549 (1973-04-01), Gump et al.
patent: 3775520 (1973-11-01), Ram et al.
patent: 3841079 (1974-10-01), Ram et al.

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