| 摘要 |
PURPOSE:To produce a titled material which does not deteriorate in properties for long time and has excellent resistance to mel sticking and the characteristic to shut off a short circuit by melting, casting and forming an alloy contg. Ag, Sn as a main solute metal, In and Bi then pulverizing the alloy after internal oxidation and press molding the alloy under heating. CONSTITUTION:An alloy contg. Ag and Sn of a man solute metal as a solute metal which can be internally oxidized by foming a solid solution with Ag, and >=1 kind of In and Bi, and contg. 3-20wt% total of said solute metals and 3- 25wt% other metallic components if contained is melted. The molten alloy is then cast and forged and the forged alloy is thoroughly internally oxidized to form the high hardness metallic oxide dispersed and precipitated with the solute metals in the Ag against the strong pressure of Ag in the stage of internal oxidation under said pressure. Such alloy is mechanically pulverized to fine powder having <=0.5mm., more preferably <=0.147mm. diameter. The fine particles are then molded to a desired shape under heating and pressing and the composite contact material of the Ag-Sn oxide is obtd. |
