Method and system for producing carbon fibers

Details Method and system for producing carbon fibers Method and system for producing carbon fibers

1985-06-05

1986-09-09

Dixon, Jr., William R.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234474, 4234476, 4234471, 264 292, 264 297, D01F 922

Patent

active

046108602

ABSTRACT:
High tensile carbon fibers are provided with a high yield process in which, after oxidation of a precursor, the fibers are first precarbonized in an inert atmosphere to to about 600.degree. C. while imparting 5-10% stretch. In precarbonizing, the fibers are initially heated in a sweeping manner with substantial volumes of hot inert gas which is extracted along with products of decomposition before the fibers are cooled to a low, non-reactive exit temperature. The arrangement minimizes redeposition of tars on the fibers and stretches the fibers in a range in which substantial off-gassing occurs. Thereafter the fibers are finally carbonized at a higher temperature with a different tension being applied, to provide a more reliable less sensitive process that enables oxidation to be effected more rapidly.

REFERENCES:
patent: 4073870 (1978-02-01), Saji et al.
patent: 4100004 (1978-07-01), Moss et al.
patent: 4301136 (1981-11-01), Yamamoto et al.

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