Invention Grant
- Patent Title: Method for producing a semifinished product and semifinished product for electrical contacts and contact piece
- Patent Title (中): 用于电触点和接触片的半成品和半成品的制造方法
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Application No.: US13127544Application Date: 2009-10-27
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Publication No.: US08992826B2Publication Date: 2015-03-31
- Inventor: Helmut Heinzel , Dirk Moog , Norbert Witulski , Stefan Dasler , Andreas Kraus , Johann Wenz , Evelin Mahle-Moessner , Volker Behrens
- Applicant: Helmut Heinzel , Dirk Moog , Norbert Witulski , Stefan Dasler , Andreas Kraus , Johann Wenz , Evelin Mahle-Moessner , Volker Behrens
- Applicant Address: DE Pforzheim
- Assignee: Doduco GmbH
- Current Assignee: Doduco GmbH
- Current Assignee Address: DE Pforzheim
- Agency: Hackler Daghighian & Martino
- Priority: DE102008056263 20081106
- International Application: PCT/EP2009/007661 WO 20091027
- International Announcement: WO2010/051922 WO 20100514
- Main IPC: B22F7/06
- IPC: B22F7/06 ; C22C32/00 ; A61L27/20 ; A61L27/56 ; A61L27/58

Abstract:
The method relates to a method for producing a strand-like, particularly band-like semi-finished part for electrical contacts, wherein the semi-finished part has a top side intended for making the electrical contact, said top side made from a silver-based composite material in which one or multiple metal oxides or carbon are embedded, and has a carrier layer supporting the composite material made of easily solderable or weldable ignoble metal, and method having the following steps: Powder-metallurgic production of a block made from the silver-based composite material, encasing of the block made of the composite material with a powder made from the easily solderable or weldable ignoble metal, compressing the block, encased by the metal powder, to condense the metal powder, sintering the compressed block in a reducing atmosphere or in an inert atmosphere or in a vacuum, avoiding the formation of fluid eutectics from the silver of the composite material and from the non-precious metal with which the block made from the silver-based composite material is encased, reshaping of the sintered block by extrusion pressing, creating a partial strand with a top side made from composite material and a bottom side made from non-precious metal.
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