Patent ID: 8992826
Filing Date: 2015-03-31
Classification: A61L,B22F,C22C

Abstract:
1. A method for producing a strand-shaped, semifinished product for electrical contacts, wherein the semifinished product has an upper face comprising a silver-based composite material intended for the electrical contact-making, one or more metal oxides or carbon being embedded in the composite material, and a carrier layer comprising easy-to-solder or easy-to-weld base metal, which carries the composite material, comprising the following steps: producing a block from the silver-based composite material using a powder-metallurgical process; covering the block comprising the composite material with a powder of the easy-to-solder or easy-to-weld base metal; isostatically pressing the block covered with the metal powder so as to compact the metal powder; sintering the pressed block in a reducing atmosphere or in an inert atmosphere or in a vacuum preventing the formation of a liquid eutectic from the silver of the composite material and from the base metal with which the block comprising the silver-based composite material is covered; working the sintered block by extrusion molding; and generating a partial strand having an upper face comprising composite material and a lower face comprising base metal.