| 摘要 |
PURPOSE:To obtain an electrical contact material with improved welding resistance by press-molding a powdered mixture having a specified composition consisting of Ag, Ni, In oxide and Cu oxide and by sintering the molded body in a reducing atmosphere. CONSTITUTION:Powders starting materials are uniformly mixed so as to provide a composition consisting of 10-30% Ni, 1.7-5% (expressed in terms of In) In oxide, 1.7-10% (expressed in terms of Cu) Cu oxide and the balance essentially Ag. The powdered mixture is press-molded and sintered in a reducing atmosphere. During the sintering, at least part of the In and Cu oxides is reduced and solubilized in Ag and Ni in the form of metal. By this method a contact material with improved welding resitance can be manufactured inexpensively. This contact material is comparable or superior to a conventional Ag-CdO type electrical contact material in contact performance.
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