Method of coating carbon bodies

Details Method of coating carbon bodies Method of coating carbon bodies

1988-10-24

1989-11-07

Lesmes, George F.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

4284735, 528185, 427113, 4273855, 427421, B32B 2700, B32B 2706, B32B 900

Patent

active

048791822

ABSTRACT:
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 composed of a carbon-filled solution of a polyamic acid formed by reaction between pyromellitic acid dianhydride and 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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