| 摘要 |
PROBLEM TO BE SOLVED: To obtain an Ag-oxide electric contactor material having excellent contact reliability, welding resistance and arc consumption resistance and used for various switches, contactors, breakers, or the like, and also to provide its manufacturing method. SOLUTION: An internally oxidizable Ag alloy prepared under the condition of 50-95% cold draft is subjected, after replacing the air in a pressurized oxidation furnace with oxygen, to temperature-raise gradually from <=200 deg.C in a pressurized-oxygen atmosphere of (5 to 50) kg/cm<2> oxygen pressure to undergo internal oxidation treatment at 700 deg.C upper limit temperature. By this method, an Ag-enriched layer forming on the outermost surface and an oxide-cohesion layer right under it can be controlled and a compound oxide of additive elements can be precipitated and dispersed finely and uniformly to the deep layer of internal structure.
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