Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1984-02-07
1985-11-05
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 22, 75234, 75235, 1481261, 428569, 428929, B22F 100
Patent
active
045513015
ABSTRACT:
AgCdO based contact elements are replaced in contactors and small circuit breakers with CdO-less type elements which exhibit little burn-off in the arc, a low welding force and minimal heating when carrying continuous current. However, known AgSnO.sub.2 contact materials do not have optimum values in all operationally important properties. In these contact materials a more firmly adhering oxide layer occurs as compared with AgCdO. The invention relates to a sintered compound material for electrical contacts, consisting of AgSnO.sub.2 Bi.sub.2 O.sub.3 CuO and containing at least one other metal oxide additive which sublimes below the melting temperature of silver. The SnO.sub.2, Bi.sub.2 O.sub.3 and CuO are globularly precipitated in silver material structure zones having a maximum diameter of 200 .mu.m, and the metal oxide additive is distributed on the surfaces of the boundary regions of these microscopic silver zones.
REFERENCES:
patent: 4141727 (1979-02-01), Shida et al.
Lechert Jr. Stephen J.
Milde Jr. Karl F.
Siemens Aktiengesellschaft
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