Research On The Processing Technics And Properties Of The Rare-earth Element－Cu-Ni-Si Alloy As Lead-Frame Coil Strip

As a key part of integrated circuit, the lead frame has been greatly developed in recent years. The copper alloy has not only excellent electrical and thermal conductivity, but also it is low cost.So it is widely used in integrated circuits.In this study, Cu-3.0Ni-0.64Si alloy of different contents of Rare-earth element Ce, which are studied the processing technics and property. The qualified ignots are hot rolled, hot rolled strips are soluted. The samples are analyzed to choice feasibly temperatures of solution treatment. Many synthetical experiments that different ageing temperature, ageing time and cold deforming affecting on structure and property of copper alloy. The effects of different contents of Ce on the microstructure and properties of the Cu-3.0Ni-0.64Si alloy were studied, the best recruitment of Ce was obtained. The results show that:As for as Cu-3.0Ni-0.64Si alloy concerned, the temperature of hot rolling is 900℃, time is 60 minutes. The temperature of solution is 900℃, time is 60 minutes. Then by about 80% cold deforming for aging, aging temperature is 480℃,time is 210 minutes. The best combination property for this Cu-3.0Ni-0.64Si alloy is 0.06%Ce of accession (Conductivity is 48.9%IACS, tensile strength is 733.17MPa). It is showed that Ce could purify melt,refine the grain,and improve the tensile strength of the Cu-3.0Ni-0.64Si alloy.In the alloy, Ni2Si plays the strengthening role.