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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsSankichi Shida, Shinji Okuma, Mashiro Oita, Hyogo Hirohata
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An electrical contact material comprising silver, bismuth oxide and tin oxide with or without tin metal, wherein the amounts of the bismuth and the tin on the basis of the sum weight of the metals in both the metal component and in the metal oxide component are 1.5 to 6 weight percent and 0.1 to 6 weight percent, respectively. This electrical contact material has high resistance to both welding and arc erosion. An advantageous method of making the electrical contact material comprises preparing a metal alloy composed of all the above metals in the above weight ratio and internally oxidizing the bismuth completely in the alloy after shaping the alloy to a desired electrical contact material shape or after crushing the alloy to scaly flakes.
An electrical contact material comprising a metal component as a major ingredient and the remainder being a metal oxide component as a minor ingredient, said metal component consisting essentially of silver with or without tin, and said metal oxide component consisting essentially of bismuth oxide and tin oxide, wherein the amount of the bismuth of said bismuth oxide is 1.5 to 6 weight percent, and the total amount of the tin of said metal component and the tin of said metal oxide component is 0.1 to 6 weight percent, respectively, both on the basis of the sum of said metal component and all the metals of said metal oxide component.
A method of making an electrical contact material, comprising:
Dependencies are inferred from the claim text.