高强高导铜银合金线材制备工艺研究

Research on the Preparation Process of High Strength and High Conductivity Copper-Silver Alloy Wires

摘要: 采用真空熔炼、下引连铸、自动冷轧和连续拉拔相结合的工艺制备了直径0.9 mm、1 wt%银含量的高强高导铜银合金线材，通过元素分析、金相显微镜、扫描电镜、拉伸试验以及导电率等测试手段，表明在熔炼炉真空度10~50 Pa、熔炼温度1200℃、保温时间1小时、牵引速度80 mm/min、冷轧速度20 m/min、拉拔速度230 m/min等工艺条件下，铜银合金线材具有较优异的综合性能，其氧含量、抗拉强度、屈服强度、断后伸长率和导电率分别为0.52 ppm、529 MPa、498 Mpa、1%和91% IACS。与市售同类产品相比，氧含量低92.4%、抗拉强度、屈服强度和导电率分别高5.6%、10.2%和3%。

Abstract: A high-strength and high-conductivity copper-silver alloy wire with a diameter of 0.9 mm and 1 wt% silver content was prepared using a process combining vacuum melting, downward continuous casting, automatic cold rolling, and continuous drawing. Tests such as elemental analysis, metallographic microscopy, scanning electron microscopy, tensile test and conductivity measurement showed that under the process conditions of a melting furnace vacuum degree of 10~50 Pa, melting temperature of 1200˚C, holding time of 1 hour, traction speed of 80 mm/min, cold rolling speed of 20 m/min and drawing speed of 230 m/min, the copper-silver alloy wires had excellent comprehensive properties. Its oxygen content, tensile strength, yield strength, elongation after fracture and conductivity were 0.52 ppm, 529 MPa, 498 MPa, 1%, and 91% IACS, respectively. Compared with similar commercially available products, its oxygen content was 92.4% lower, and its tensile strength, yield strength and conductivity were 5.6%, 10.2% and 3% higher respectively.