초록 ▼

A process is described for the manufacture of strip comprising a base metal substrate, a coating which has been electrodeposited on selected surface portions of said substrate and consists of precious metal or a precious metal alloy and, if desired, an intermediate diffusion barrier layer consisting

A process is described for the manufacture of strip comprising a base metal substrate, a coating which has been electrodeposited on selected surface portions of said substrate and consists of precious metal or a precious metal alloy and, if desired, an intermediate diffusion barrier layer consisting particularly of nickel. The resulting strip constitutes a semifinished product for use in the making of electric contacts. When the coating has been electrodeposited, the strip is subjected to a recrystallizing annealing and to a rolling operation, preferably a cold-rolling operation.

대표청구항 ▼

The method of manufacturing a semi-finished coated strip material to be used for manufacturing electrical contacts, the strip comprising a base metal substrate made of copper or a copper alloy, a surface layer made of precious metal or a precious metal alloy on selected portion of the substrate and

The method of manufacturing a semi-finished coated strip material to be used for manufacturing electrical contacts, the strip comprising a base metal substrate made of copper or a copper alloy, a surface layer made of precious metal or a precious metal alloy on selected portion of the substrate and an intermediate layer consisting of a base metal forming a diffusion barrier therebetween, comprising the steps of depositing said intermediate layer on said substrate strip, electro-despositing said surface layer on said selected portions of the substrate strip above said intermediate layer, subjecting the coated strip to at least one heat treatment resulting in a recrystallization of said substrate, said intermediate layer and said surface layer, and cold-rolling the coated strip so that its thickness is reduced by 10 to 50 percent of the thickness it had before the rolling operation.