| 摘要 |
PURPOSE:To improve the tensile strength and electrical conductivity of the titled alloy by incorporating specific ratios of rare earth elements, Co and oxygen into copper. CONSTITUTION:The copper alloy consists of, by weight, 0.005-1.0% rare earth elements, 0.1-2.0% Co, 100-4,000ppm O and the balance Cu. Since said alloy has high electrical conductivity and high strength, it is useful as a lead frame for IC, LSI, etc., or as the trolley wire of a trolley car. In said compsn., rare earth elements combine with O in the alloy compsn. and turned into the fine grains of rare earth oxide to disperse into the alloy. Any kind of rare earth elements may therefore be used so long as it has high affinity. In the content of rare earth elements, the amount above the lower limit is required to attain the desired object characteristics, and the increase of specific resistance, i.e., IACS is drastically decreased in the case of above the upper limit. The tensile strength is decreased in the case of below the lower limit of Co content, and the specific resistance is violently increased in the case of above the upper limit thereof. The specific resistance is increased in the case of below the lower limit of O content, and the specific resistance is violently increased in the case of above the upper limit thereof.
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