| 摘要 |
PURPOSE:To obtain phosphor bronze excellent in migration resistance by blending specific amounts of Sn, Zn and P with Cu. CONSTITUTION:The phosphor bronze has a composition consisting of, by weight, 3-9% Sn, 1-5% Zn, 0.03-0.35% P, and the balance Cu with inevitable impurities. As to the Sn content, the upper limit is determined from productivity and the lower limit is determined from tensile strength, elongation, elastic limit value and formability belonging to mechanical properties. When the P content is 0.03% or below, deoxidation is insufficient and, when it exceeds 0.35%, conductivity is deteriorated. Moreover, by further adding Zn again so as to form a quaternary alloy, migration resistance can be improved to the level of that of brass.
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