Patent ID: 7976892
Filing Date: 2011-07-12
Classification: H05K

Abstract:
1. A method for producing a conductive layered coating on an insulating substrate, comprising: equipping, in selected regions, at least one surface of an electrically insulating substrate with a coating of an electrically highly conductive first metal, the coating being structured as conductor paths; structuring the first metal to cover locally the at least one surface of the substrate; cleaning the at least one coated surface; seeding the coating with seeds of a second metal; depositing a first layer including an alloy of the second metal onto the coating seeded with the seeds of the second metal; depositing a second continuous layer including the alloy of the second metal onto the coating seeded with the seeds of the second metal, the second continuous layer covering the first layer; firing the substrate deposited with the first and second layers of the second metal to form the conductive layered coating, the firing being performed so that the first metal is diffused with the second metal; and contacting a gold bonding wire to the conductive layered coating, wherein the substrate includes a low-temperature co-fired ceramic (LTCC), the first metal includes silver, and the second metal includes palladium.