Silver and metal oxides electrical contact material and method f

Details Silver and metal oxides electrical contact material and method f Silver and metal oxides electrical contact material and method f

1985-01-23

1986-01-21

Albrecht, Dennis L.

Metal treatment

Stock

Noble metal base

75234, 75252, 252512, 252514, 252515, 419 21, 420501, 420502, C22C 105, C22C 506, C22C 3200, H01H 102

Patent

active

045655901

ABSTRACT:
The invention relates to a material for electrical contacts, in particular for contact studs in low-voltage switchgear. The material consists of silver, tin oxide and other additives. A material is sought where the overtemperature is lowered as compared with known AgSnO.sub.2 material. According to the invention, the further additives are in combination oxides of the metals tantalum (Ta.sub.2 O.sub.5), copper (CuO) and bismuth (Bi.sub.2 O.sub.3). Further the material may contain also tungsten or oxygen containing tungsten compounds. Preferably the material contains 5 to 20 mass % SnO.sub.2, 0.1 to 5 mass % Ta.sub.2 O.sub.5 5 mass % CuO, 0.1 to 5 mass % Bi.sub.2 O.sub.3, optionally 0.05 to 3 mass % tungsten and silver as balance. In the method for producing contact studs, the powder metallurgical production of the material is followed by extrusion to a ribbon, from which contact studs can be separated which have an edge-parallel directional structure.

REFERENCES:
patent: 3954459 (1976-05-01), Schreiner
patent: 3992199 (1979-02-01), Neely
patent: 4141727 (1979-02-01), Shida
patent: 4246321 (1981-01-01), Shibata
patent: 4294616 (1981-10-01), Kim
patent: 4330330 (1982-05-01), Bohm
patent: 4341556 (1982-07-01), Bohm
patent: 4361033 (1982-11-01), Kim
patent: 4410491 (1983-10-01), Bohm
patent: 4462841 (1984-07-01), Miyakawa

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