Method of coating carbon bodies

Details Method of coating carbon bodies Method of coating carbon bodies

C - Chemistry, Metallurgy

04

B

117/113, 117/196

C04B 41/83 (2006.01) B05D 3/02 (2006.01) C04B 41/48 (2006.01)

Patent

CA 2000083

METHOD OF COATING CARBON BODIES Abstract of the Disclosure Described is a way of sealing a carbon body such as monolithic graphite tooling so that it retains its vacuum integrity through numerous thermal cycles typical of thermoplastic processing. This is accomplished by (a) applying to the body surface a coating formulation com- posed of a carbon-filled solution of a polyamic acid formed by reaction between pyromellitic acid dianhydride and a 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane, and (b) heat curing the coated body to cause the polyamic acid to imidize into a thermally cured polyimide.

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