NAIBUDODOTAIOJUSURUSERAMITSUKUTASOKOZOTAINOSEIZOHOHO

摘要

A method of forming a hermetic flux-sintered ceramic multilayer structure with internal copper conductor comprising: (a) forming at least one green ceramic layer comprised of a thermoplastic organic binder having dispersed therein a finely divided ceramic powder and a low melting flux; (b) forming on the surface of a first green ceramic layer a pattern of copper-based conductor paste comprised of fine copper powder, a non-cellulosic binder, and a solvent for the non-cellulosic binder which is a nonsolvent for the thermoplastic organic binder in the green ceramic layer; (c) laminating a second green ceramic layer on the surface of the first ceramic layer to sandwich the pattern therebetween; (d) heating the composite structure in an ambient gas comprising a dry buffered gas mixture whereby maintaining an oxygen partial pressure sufficient to remove the organics but not to oxidize the copper. m