Patent · US Expired

Silver-based contact material for switchgear used in power engineering

US5663500A · kind A · utility

2Cited by

4References

8Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Franz Hauner · Baiersdorf, DE
Manfred Muller · Berlin, DE
Gunter Tiefel · Fürth, DE

Key dates

Filing date	Jun 20, 1996
Grant date	Sep 2, 1997
Priority date	—
Expiry date	Jun 20, 2016

Classification

Technology area (CPC H)Electricity
CPC primaryH01H2001/02378
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Substitute materials are increasingly proposed for contact pieces in low-voltage switches, which until now frequently consisted of silver-nickel. In the case of such a substitute material which, besides silver, contains at least iron oxide (Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4) and zirconium oxide (ZrO.sub.2) as active components, the making capacity with regard to the critical welding current is improved by an addition of a further oxide of the sixth subgroup of the Periodic System and/or of a mixed oxide that consists of iron oxide and the oxide of an element of the sixth subgroup of the Periodic System. In this connection, the further additive is, in particular, ferro-wolframate (FeWO.sub.4).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.