PURPOSE: To produce a sintered type contact point material having a uniform contact point characteristic by mixing a part of the main componet material powder of roughly the same amt. as the amt. of auxiliary component material powder with the auxiliary powder then mixing the remaining main component material powder therewith.
CONSTITUTION: A main component material is constituted of about 15W65% highly conductive components consisting of at least 1 kind of Cu and Ag, and the balance an arc resistant component of at least 1 kind among W, Mo, Cr, Ti, WC, MoC, Cr3C2, TiC. An auxiliary component material is constituted of a component for preventing melt sticking consisting at least 1 kind among Bi, Te, Sb, and a component for improving sintering property consisting of at least 1 kind among Ni, Fe, Co, B. The content of the auxiliary component material in the product, i.e., contact point material, is set at ≤3wt%, and part of the main component material of roughly the same amt. as the amt. of the auxiliary component material is first mixed with the auxiliary component material to prepare a primary powder mixture; further, the remaining main component material is mixed therewith. Such powder mixture is molded under about 1W10 tons/ cm2 pressure and is sintered at about 1,000W1,300°C in a non-oxidative atmosphere, whereby the contact point material is obtd.
SUZUKI HIDEO
SEKIGUCHI SHIGEAKI
MATSUURA IKUO
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