Coating apparatus – With cutting – punching or tearing of work – Web or sheet work
Patent
1975-12-19
1977-09-20
Kaplan, Morris
Coating apparatus
With cutting, punching or tearing of work
Web or sheet work
C23C 1308
Patent
active
040489531
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 (5mm. 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 flow passages are disposed in polycrystalline graphite guide plates forming a narrow slot through which the material passes. The gas flow cools the passages and prevents the hydrocarbon content from depositing out on and clogging them. The hydrocarbon gas impinges on the heated fibers and forms a deposit of pyrolytic carbon on them, which is heavier in back than in front. A pair of 13 mil. thick sheets are effectively infiltrated within a 40 mil. deep slot. 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).
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Kaplan Morris
Pfizer Inc.
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