Metal working – Method of mechanical manufacture – Electrical device making
Patent
1976-10-15
1978-08-01
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29424, 65 43, 65 59R, 65 59B, 174152GM, 339278C, H01B 1726
Patent
active
041034163
ABSTRACT:
An electrical terminal device comprises a metallic body or support cut through which an iron-chronmium alloy, conductive lead wire extends in an insulated and sealed manner. The free ends of the lead wire or wires extend out of the cup. A glass-to-metal seal is provided between the wires and the cup. The free ends of the lead wires are partially plated or coated with a layer of an oxidation resistant metal. A portion intermediate the free ends is provided with a layer of chromium oxide to improve the seal between the lead wire and a fused glass bead held in an aperture in said support cup. The method of manufacturing such devices comprises partially plating a nickel, copper or other metal which is resistant to oxidation in a hydrogen atmosphere at high temperature and humidity, on the surface of the terminal end portions of the lead wires, while the intermediate portion where the conductor is secured to a glass bead is left free of such a plating. The intermediate portion is then oxidized to provide a chromium oxide layer on the intermediate portion of the lead wire by a selective oxidation of the chromium component. A hermetic seal is then provided between the intermediate portion or rather the chromium oxide layer of the intermediate portion and a glass bead as well as between the glass bead and the cup. The oxide layers on the exposed surfaces of the support cup and on the lead wire, if any, are then removed in a reducing atmosphere.
REFERENCES:
patent: 2284151 (1942-05-01), Kingston
patent: 2446277 (1948-08-01), Gordon
patent: 3141753 (1964-07-01), Certa
patent: 3199967 (1965-08-01), Pixley
patent: 3637917 (1972-01-01), Oates
Fasse W. G.
Hall Carl E.
New Nippon Electric Co. Ltd.
Roberts W. W.
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