| 摘要 |
<p>Electrical-contact materials made from internally oxidized Ag alloys of the Ag-SnO system. The alloys contain 0.5 - 12 wt % of Sn, 0.5 - 15 wt % of In or 0.01 - 1.5wt % of Bi, balance Ag. As it was found that, after the internal oxidation treatment, the dispersion of metal oxides was not uniform and segregation occurred, a new method of manufacturing these materials was used. As contact surface the section that was most remote from the face where the oxidation started was used. The alloy can be manufactured with a thickness slightly larger than twice the desired thickness of the final product, fixedly sandwiched between thin pure silver layers, internally oxidized and cut horizontally in two; the depletion zone, containing little or no oxides, disappears by this cutting operation.</p> |
