| 摘要 |
An aggregate and/or integrate comprising of silver and tin oxides and/or tin alloy oxides of 4-25 weight % which have been prepared to have the oxides dispersed in the silver, are subjected to a temperature above the melting point of silver, whereby an electrical contact material made from said aggregate and/or integrate comes to have a continuous silver matrix as if produced by an internal oxidation method and also to have such uniform dispersion of the metal oxides in said silver matrix which is comparable or superior to that producible by a powder metallurgical method. The above-mentioned heat treatment is accompanied with hammer or press forging resulting in dimensional reduction of the aggregate and/or integrate such as their shaping, upsetting, and drawing-down. The contact material has, in addition to an excellent elongation and high conductivity, much greater resistance to shock.
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