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US 4,039,341 AGranted
Production of carbon articles
AssigneeNational Research Development Corporation
InventorsGeorge Anthony Cooper, Rayner Michael Mayer, William Watt
Life of this patent
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AssigneeNational Research Development Corporation
InventorsGeorge Anthony Cooper, Rayner Michael Mayer, William Watt
Estimating the term…
A process for the production of a carbon article is provided by which a synthetic organic fibre which is capable of conversion to high strength, high modulus carbon fibre and which has been partially so converted is impregnated with a synthetic organic resin and the resin/fibre impregnate subject to a carbonization treatment in an inert atmosphere at a temperature of at least 1000.degree. C. Preferably the fibre is polyacrylonitrile which has been heated at a temperature of 200.degree. to 250.degree. C in an oxidizing atmosphere. The resin may be a phenol/formaldehyde resin, a polyvinylidene chloride resin or a polyfurfuryl alcohol resin. The process is particularly suited to the production of carbon articles in the form of fibre or rod by drawing the fibre first through the resin to impregnate it and then through a die to form the resin/fibre impregnate.
A process for producing a carbon-fiber-reinforced carbon body, which comprises:
A process for the production of a carbon article in the form of a fibre or rod which includes the steps of (1) passing a continuous tow of polyacrylonitrile fibre which has previously been subjected to a heat treatment in an oxidising atmosphere at a temperature in the range 200.degree. to 250.degree. C. while being at least substantially restrained from shrinking, through a liquid resin selected from the group consisting of phenol/formaldehyde resins, polyvinylidene chloride resin and polyfurfuryl alcohol resin to impregnate the oxidized fibre with the said resin, (2) drawing the resin/fibre impregnate through a die to form it into a fibre or rod shape, (3) passing the said formed impregnate through a furnace to cure said resin and (4) subjecting the cured resin/oxidized fibre impregnate to carbonisation at a temperature of at least about 1000.degree. C. to carbonize the oxidized resin and fiber, the tendency of the carbon article to crack being reduced by a reduction in the relative shrinkage between the oxidized fiber and resin impregnate as compared with the shrinkage that would result during carbonization of the resin impregnate relative to a carbonized fiber.
A process for the production of a carbon article having a reduced tendency to crack which includes the steps of:
A process for the production of a carbon article in the form of a fiber or rod which includes the steps of (1) impregnating with a carbonizable synthetic organic resin a continuous tow of polyacrylonitrile fiber which has previously been subjected to heat treatment at a temperature of about 200 to 250.degree. C. in an oxidizing atmosphere while the said polyacrylonitrile fiber is at least substantially restrained from shrinking, (2) forming the said synthetic organic resin/oxidized fiber impregnate into a fiber or rod, (3) curing the synthetic organic resin, and (4) subjecting the synthetic organic resin/oxidized fiber impregnate to carbonization at a temperature of at least about 1000.degree. C. to carbonize the fiber and the oxidized resin, the tendency of the carbon article to crack being reduced by a reduction in the relative shrinkage between the oxidized fiber and resin impregnate as compared with the shrinkage that would result during carbonization of the resin impregnate relative to a carbonized fiber.
Dependencies are inferred from the claim text.