Method and system for producing carbon fibers

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

1991-11-12

1993-03-16

Bennet, Henry A.

Heating

Advancing structure flexing, looping or coiling sheet, web...

4234477, 4234478, 34156, F27B 928

Patent

active

051939967

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 intially 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:
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patent: 3745104 (1973-07-01), Hou
patent: 3971840 (1976-07-01), Economy
patent: 4217090 (1980-08-01), Whike et al.
patent: 4301136 (1981-11-01), Yamamoto et al.
patent: 4389387 (1983-06-01), Miyamori et al.
patent: 4534920 (1985-08-01), Yoshinaga et al.
patent: 4543241 (1985-09-01), Yoshinori et al.

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