Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1975-06-05
1978-02-14
Meros, Edward J.
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
81155, 106307, 4234472, 423460, D01F 912, D06B 1900, C08K 304
Patent
active
040738698
ABSTRACT:
The internal structure of carbon fibers (as defined) is modified to yield a fibrous product having a bound oxygen content of about 3 to 30 percent by weight which exhibits substantially different bulk properties than that of the starting material. The carbon fiber precursor is contacted with a strong acid medium comprising nitric acid and optionally sulfuric acid and water (as defined) under conditions found capable of producing the desired internal chemical modification. In a preferred embodiment of the process the strong acid medium is formed by a combination (as defined) of fuming nitric acid and fuming sulfuric acid. The fibrous product exhibits, inter alia, reduced electrical and thermal conductivities, and particularly is suited for use as an ablative reinforcing medium.
REFERENCES:
patent: 3746560 (1973-07-01), Goan et al.
patent: 3853610 (1974-12-01), Byrne et al.
Harris et al., "J. Material Science" (4), 1969, pp. 432-438.
Derwent Japanese, 11.4.68-17.4.68, vol. 7, No. 15, p. 6.
Chemical Abstracts, vol. 64, 1966, 12862(b,c,d).
Celanese Corporation
Meros Edward J.
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