Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1976-07-16
1978-07-11
Padgett, Benjamin R.
Electricity: circuit makers and breakers
Electric switch details
Contact
200262, 200267, 200270, 339278C, 428550, 428548, H01H 102
Patent
active
041003853
ABSTRACT:
To reduce costs and permit use of a smaller amount of noble metals in nobel metal contacts, a common metal contact material which forms, in an oxygen-containing atmosphere or in air, non-porous insulating oxides, is coated with a porous noble metal or noble metal alloy cover layer, the pores or regions not covered by the noble metal or nobel metal alloy being permitted to oxidize to form a protective common metal contact material oxide, the noble metal regions in contact with the underlying contact material itself providing for the electrical connection. Preferably, the porous cover layer has a thickness of between about 0.1 to 0.2 .mu.m, and the contact material, separately or applied to a carrier, has a thickness of between 2 to 100 .mu.m, preferably about 10 .mu.m, and comprises aluminum, titanium, niobium, chromium, silicon, zirconium or tantalum, the noble metal preferably being gold or a gold alloy, applied under exclusion of oxygen to the underlying contact material after any oxide skin thereon has been removed.
REFERENCES:
patent: 1904241 (1933-04-01), Kammerer
patent: 3617990 (1971-11-01), Colardeau
Barry J. L.
Padgett Benjamin R.
W. C. Heraeus GmbH
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