Process for producing carbon fibers

Details Process for producing carbon fibers Process for producing carbon fibers

1975-09-17

1977-03-01

Camby, John J.

Heating

Processes of heating or heater operation

Controlling flame position or work atmosphere

432 59, F27B 904

Patent

active

040099911

ABSTRACT:
Carbon fibers are produced by continuously heat-treating acrylonitrile fibers up to the crystal collapse starting temperature of said fibers while maintaining said fibers under a fixed length or tension in an oxidizing atmosphere, then sufficiently thermally stabilizing fibers by further subsequently continuously heat-treating them in a temperature range gradually elevated up to a fixed temperature in a range of from a temperature about 20.degree. C lower than the deterioration starting temperature of said fibers to a temperature about 20.degree. C higher than said deterioration starting temperature in an oxidizing atmosphere. The thus sufficiently thermally stabilized fibers are treated with a reducing liquid and subsequently carbonized or graphitized in a non-oxidizing atmosphere or under a vacuum.

REFERENCES:
patent: 2665125 (1954-01-01), Klug
patent: 3547420 (1970-12-01), Longstuff

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