Method for making a ceramic multilayer structure having internal copper conductors
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United States of America Patent
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Aug 23, 1988
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N/A
app pub date -
Jan 13, 1987
filing date -
Jan 13, 1987
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Abstract
The method is directed to 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.
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