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US 4,728,535 AGranted
Method of manufacturing thin carbon products
AssigneeGreat Lakes Carbon Corporation
InventorsLouis A. Joo', Kenneth W. Tucker, Frank E. McCown, Jr.
Life of this patent
Estimating the term…
Abstract
Thin carbon products are produced from cellulose material by impregnation with a carbonaceous material followed by curing and baking. The baked product may optionally be graphitized depending on end use.
Claims16
A process for the production of thin carbon plates useful in primary and secondary electrochemical cells and having a thickness from 0.25 mm to 5 mm and a porosity of 30% to 85% by volume comprising:
- (1) impregnating a cellulose sheet material consisting essentially of cotton linters with a carbonaceous impregnant selected from the group consisting of coal tar, solvent-cut coal tar pitch, slurry oil, creosote oil and mixtures thereof, (2) curing said impregnated material in air at a temperature from 90.degree. to 300.degree. C., and (3) baking said material in an inert or reducing atmosphere to carbonize the impregnant.
A process for producing a porous carbon plate for use in a fuel cell and having a thickness of from 0.25 to about 2.6 mm and a porosity by volume of 30 to 85% comprising:
- (1) impregnating a paper sheet consisting essentially of cotton linters with a carbonaceous liquid selected from the group consisting of coal tar, solvent-cut coal tar pitch, slurry oil, creosote oil and mixtures thereof, (2) curing said impregnated material in air at a temperature from 90.degree. to 300.degree. C., (3) baking said material in an inert or reducing atmosphere to carbonize the impregnant, and (4) repeating said impregnation, cure and bake cycles until a desired porosity is achieved.
Dependencies are inferred from the claim text.