Metal working – Method of mechanical manufacture – Electrical device making
Patent
1976-07-26
1977-05-17
Duzan, James R.
Metal working
Method of mechanical manufacture
Electrical device making
29597, 29622, 29630E, 204 32R, H01R 4300
Patent
active
040232662
ABSTRACT:
In a process or method according to the invention the parts of an electrical contact device, such as a slip ring comprising the ring to receive the liquid metal and the probe or brush for contacting the liquid metal are treated by sputter etching to remove the parent metal oxide. Prior to exposure of the electrodes to any oxygen, a sacrificial metal is sputter deposited on the parts. Preferably this sacrificial metal is one that oxidizes slowly and is readily dissolved by the liquid metal. The sacrificial metal may then be removed from unwanted areas. The remainder of the ring and the probe to be wet by the liquid metal are submerged in the liquid metal or the liquid metal is flushed over these areas, preferably while they are being slightly abraded, until all the sacrificial material on these portions is wet by the liquid metal. In doing so the liquid metal dissolves the sacrificial metal and permanently wets the parent metal. Preferred materials used in the process and for the electrodes of electrical contact devices are high purity (99.0%) nickel or AISI type 304 stainless steel for the electrical contact devices, gallium as the liquid metal, and gold as the sacrificial material.
REFERENCES:
patent: 3144533 (1964-08-01), Donath
patent: 3369094 (1968-02-01), Langberg et al.
patent: 3444408 (1969-05-01), Krulls
patent: 3497426 (1970-02-01), Okamura
patent: 3616285 (1971-10-01), Norris
patent: 3909569 (1975-09-01), Jones
patent: 3966570 (1976-06-01), Yamagishi et al.
Berkopec Frank D.
Culp David H.
Lovell Robert R.
Duzan James R.
Manning John R.
Musial N. T.
Shook G. E.
The United States of America as represented by the Administrator
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