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US 4,565,683 AGranted
Production of carbon filaments
AssigneeExxon Research & Engineering Co.
InventorsDavid J. C. Yates, Rees T. Baker
Life of this patent
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Abstract
Disclosed is a method for producing carbon filaments by dissociating a carbon-containing gas at a temperature to about 800.degree. C. in the presence of iron monoxide. The iron monoxide can be produced by treating a sample of substantially pure iron with steam at a temperature from about 540.degree. C.
Claims4
A method for producing carbon filaments, which method comprises:
- (a) heating a metallic iron composition, comprised of at least about 95 wt. % iron, to a temperature of at least about 540.degree. C., which iron composition is in a form selected from tube, sheet, rod, foil, and gauze;
- (b) contacting the heated iron composition with steam for an amount of time which will convert all, or a portion of, the iron composition to FeO, but no greater than the time at which FeO begins to convert to Fe.sub.3 O.sub.4 ;
- and
- (c) contacting the resulting iron monoxide with one or more carbon-containing gases at a temperature from the dissociation temperature of the gas to about 800.degree. C., wherein the iron composition is substantially free of:
- (aa) elements which form protective oxides at the temperature employed in step (a) above;
- and (bb) metal components which are volatile at the temperature employed in step (a) above.
3 more elements
Dependencies are inferred from the claim text.