Electrical switching contact
AssigneeW. C. Heraeus GmbH
InventorsGunther Herklotz, Walter Reichelt
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Abstract
The present invention provides low-current carrying rem-reed switch contacts, preferably for operation under vacuum or under a protective gas. The contacts comprise a medium-hard magnetic material substrate which may contain anomalies on the surface. These are covered by an intermediate layer from 1 to 20 .mu.m of at least one metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium and tantalum. This intermediate layer is then covered with a noble metal layer, for example alloys of gold or silver, and preferably by ruthenium.
Claims15
Low-current rem-reed switch contact encased in a housing under vacuum or a protective gas comprising a substrate of medium-hard magnetic material having a coercive field strength of from 20 to 90 Oe containing anomalies on the surface thereof,
- an intermediate layer of a thickness from 1 to 20 .mu.m coated on at least a portion of said substrate, said intermediate layer consisting of at least one metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium and tantalum, and
- an outer contact layer between 1 and 10 .mu.m thick on said intermediate layer, said outer contact layer comprising a noble metal or noble metal alloy.
Dependencies are inferred from the claim text.