Insulating coating for ceramic substrate and method to form such a coating.

摘要

The blanket or selective coating consists of polyimide (12) and of between about 28 and about 84% by weight of mica platelets (10). To produce the coating a solution of a polyamic acid containing between about 9% and about 45% by weight of mica is applied to the substrate (14) either uniformly or through a screen having a desired pattern. The solvent is removed and the resulting layer is cured into a solid adhering coating. The coating is preferably used to insulate current-carrying metal patterns disposed on ceramic substrates onto which silicon chips with integrated circuits are mounted.