Method for vapor depositing pyrolytic carbon on porous sheets of

Details Method for vapor depositing pyrolytic carbon on porous sheets of Method for vapor depositing pyrolytic carbon on porous sheets of

1974-06-19

1976-03-16

Kendall, Ralph S.

Coating processes

Heat decomposition of applied coating or base material

Coating decomposed to form carbide or coating carbonized

118 48, 118 49, 427249, 427122, 427289, 427294, C01B 3104, C23C 1100

Patent

active

039446867

ABSTRACT:
An elongated continuous porous sheet of fibrous carbon, such as paper of matted graphite fibers, woven graphite cloth or carbonized filter paper is longitudinally traversed through a reduced pressure heating zone (5 mm. of Hg.) in which hydrocarbon gas is perpendicularly directed at relatively high velocities through restricted flow passages at the sheet, which is heated to a temperature of about 2200.degree.C. The sheets are traversed at a speed of about 60 to 3600 feet per hour at a temperature of about 2000.degree. to 2400.degree.C at a pressure of from about 4 to 20 mm. Hg. A hydrocarbon gas, at a flow rate of from about 5 to 20 c.f.m. effectively infiltrates the carbon sheet material and increases the sheet density by at least 20 grams per square meter. The velocity of the carbon depositing flow stream is maintained at from about 20 to 200 ft. per minute (STP).

REFERENCES:
patent: 3317338 (1967-05-01), Batchelor
patent: 3379555 (1968-04-01), Hough
patent: 3692565 (1972-09-01), Lersmacher et al.
patent: 3725110 (1973-04-01), Rodgers et al.
patent: 3829327 (1974-08-01), Omori et al.

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