Electrical contact piece
AssigneeDegussa AG
InventorsMalikowski, Willi, Andreas Szulczyk, Wolfgang Bohm, Roger Wolmer
Life of this patent
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Abstract
There is described an electrical contact piece made of a silver-metal oxide material as contact coating, a carrier made of copper, or iron and an intermediate layer which furnishes a high adhesive strength of the contact coating to the contact carrier even at a high number of switchings. The intermediate layer consist essentially of a silver alloy having 2 to 12 weight % of tin, indium, and/or germanium.
Claims23
In an electrical contact piece comprising a silver-metal oxide work material as the contact coating, a copper or iron carrier and an intermediate layer the improvement comprising employing as the intermediate layer a silver alloy consisting essentially of (a) 2 to 12 weight % of at least one member of the group consisting of tin, indium and germanium and (b) silver.
In an electrical contact piece comprising a silver-metal oxide work material as the contact coating, a copper or iron carrier and an intermediate layer, a silver alloy consisting essentially of (a) 2 to 12 weight % of at least one member of the group consisting of tin, indium and germanium, (b) silver and (c) lead, the amount of lead in the alloy being up to 10 weight %.
In an electrical contact piece comprising a silver-metal oxide work material as the contact coating, a copper or iron carrier and an intermediate layer, a silver alloy consisting essentially of (a) 2 to 12 weight % of at least one member of the group consisting of tin, indium and germanium, (b) silver and (c) lithium, the amount of lithium being up to 0.5 weight %.
Dependencies are inferred from the claim text.