| 摘要 |
An object of the present invention is to provide a method of producing an Ag-ZnO electric contact material which can uniformly disperse ZnO micrograms in Ag; which maintains low contact resistance; which exhibits enhanced welding resistance and wear resistance; and which is suitable in view of production costs. The method of producing an Ag-ZnO electrical contact material comprises casting Ag and Zn at predetermined proportions and subjecting the resultant Ag-ZnO alloy to internal oxidation so as to disperse ZnO in Ag, the method being characterized in that an Ag-Zn alloy comprising 5-10 wt. % (as reduced to weight of metal) Zn, the balance being Ag, is formed into chips; the chips are subjected to internal oxidation; the internally oxidized chips are compacted to thereby form billets; the billets are pressed and sintered; and subsequently, the sintered billets are extruded, to thereby yield uniform dispersion, in Ag, of ZnO micrograms.
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