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OwnerShigeru Kikuchi, Takashi Mashiko +5inventors
InventorsShigeru Kikuchi, Takashi Mashiko, Masato Kobayashi, Kenji Tsuchiya, Noboru Baba, Takashi Sato, Yoshio Koguchi
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An object of the invention is to provide an electrical contact of a low surge type which is easily manufactured, has a small environmental influence, and has a small chopping current value, a manufacturing method of the same, a vacuum interrupter using the same, and a vacuum circuit-breaker using the same. The invention provides an electrical contact having a high conductive metal, and a refractory element constituted by a metal nitrogen or a metal oxide. The high conductive metal can employ Ag or Cu or alloys mainly containing either Ag or Cu, the metal nitride can employ one or mixture of two or more of Mg3N2, AlN, TiN, ZrN, CrN, Cr2N, NbN, BN and Si3N4, and the metal oxide can employ one or mixture of two or more of MgO, Al2O3, TiO2, Ti2O3, ZrO2, ThO2, Cr2O3, Nb2O5, Y2O3 and ZnO. Accordingly, it is possible to secure an improved resistance welding performance.
An electrical contact having a high conductive metal, a refractory element made of a metal nitride or a metal oxide, and an active metal, characterized in that said active metal is the same metal as said refractory element.
A method of manufacturing an electrical contact characterized by a step of heating and sintering a mixed powder having a high conductive metal powder, an active metal powder, and a refractory element powder made of a metal oxide of a metal nitride constituted by the same metal as the active metal at a temperature equal to or less than a melting point of said high conductive metal, after pressure molding.
Dependencies are inferred from the claim text.