Ultrahigh strength carbon fibers

Details Ultrahigh strength carbon fibers Ultrahigh strength carbon fibers

1989-01-18

1991-02-12

Chaudhuri, Olik

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234472, 4234477, 264 292, D01C 506, D01F 922

Patent

active

RE0335371

ABSTRACT:
An ultrahigh strength carbon fiber having a surface layer having a crystalline completeness which is substantially the same as or higher than that of the central region of the fiber, and a functional group amount ratio [(O.sub.ls /C.sub.ls)] (O.sub.1s /C.sub.1s) of 0.1 to 0.4 as detected in the fiber surface by X-ray photoelectron spectroscopy, the surface layer preferably having an ultrathin outermost layer having a lower crystalline completeness than the central region of the fiber.

REFERENCES:
patent: 3657082 (1972-04-01), Wells et al.
patent: 3746560 (1973-07-01), Goan et al.
patent: 4070446 (1978-01-01), Horikiri et al.
patent: 4073869 (1978-02-01), Kolmin
patent: 4113847 (1978-09-01), Fukushima et al.
patent: 4131644 (1978-12-01), Nagasaka et al.
patent: 4349523 (1982-09-01), Hiramatsu et al.
patent: 4555393 (1985-11-01), Sorensen et al.

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