Silver-based contact material for use in power engineering switchgear
AssigneeSiemens Aktiengesellschaft
InventorsFranz Hauner, Gunter Tiefel
Life of this patent
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Abstract
In particular for contacts in low-voltage switches, the contact material consists of silver and further active components. In accordance with the invention, there are present as active components, in combination, iron oxide (Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4) in a proportion of between 1 and 50% by weight and at least one oxide of a further chemical element in a proportion of between 0.01 and 5% by weight. In particular, contact materials of the constitution AgFe.sub.2 O.sub.3 ReO.sub.2 and AgFe.sub.2 O.sub.3 ZrO.sub.2 have proven suitable in practice. The manufacture of the material and fabricating of the contacts can be effected by methods of powder metallurgy with the inclusion of molding or extrusion technique.
Claims4
A silver-based contact material for use in power engineering switchgear, comprising:
- a base of silver, an iron oxide selected from the group consisting of Fe.sub.2 O.sub.3 and Fe.sub.3 O.sub.4 and mixtures thereof as a main active component, and at least one further metal component selected from the group consisting of rhenium oxide (ReO.sub.2), bismuth zirconate (2Bi.sub.2 O.sub.3 x3ZrO.sub.2), boron oxide, boric acid (H.sub.3 BO.sub.4) and zirconium oxide (ZrO.sub.2) and mixtures thereof as a secondary active component, wherein the iron oxide main active component is present in a proportion of between 1 and 50% by weight with respect to the silver-based contact material and the secondary active component is present in a proportion of between 0.01 and 5% by weight with respect to the silver-based contact material.
A silver-based contact material for use in power engineering switchgears, comprising:
- 2 to 20% by weight of an iron oxide selected from the group consisting of Fe.sub.2 O.sub.3 and Fe.sub.3 O.sub.4 and mixtures thereof as a main active component;
- at least one of 0.5 to 3% rhenium oxide (ReO.sub.2), 0.05 to 3% bismuth zirconate (2Bi.sub.2 O.sub.3 x3ZrO.sub.2), 0.05 to 0.5% boric acid (H.sub.3 BO.sub.4) and 0.05 to 2% zirconium oxide (ZrO.sub.2) as a secondary active component;
- and a balance of silver wherein the total proportion of the secondary active component is no more than 5% by weight of the material.
Dependencies are inferred from the claim text.