LAUSR

Wear behaviors of a peak-aged Cu-15Ni-8Sn alloy fabricated by powder metallurgy were investigated. The results indicated that the friction coefficients and the wear rates of Cu-15Ni-8Sn alloy within a normal load range of 50-700 N and a sliding speed range of 0.05-2.58 m/s were less than 0.14 and 2.8×10 −6 mm 3 /mm, respectively. Stribeck-like curve and wear map were developed to describe the oil-lubrication mechanism and wear behavior. The equation of the dividing line between zones of safe and unsafe wear life was determined. Lubricating oil was squeezed into micro-cracks under severe wear conditions. In addition, the lubricating oil reacted with Cu-15Ni-8Sn alloy to generate the corresponding sulfides, which hindered the repair of micro-cracks, promoted cracks growth, and led to delamination. This work has established guidelines for the application of the Cu-15Ni-8Sn alloy under oil-lubricated conditions through developing wear map. 本文研究了粉末冶金法制备的峰时效态Cu-15Ni-8Sn 合金的磨损行为。结果表明:Cu-15Ni-8Sn 合金在50~700 N 的载荷和0.05~2.58 m/s 的滑动速度下进行摩擦磨损试验时,其平均摩擦系数均小于 0.14、磨损率均小于2.8×10 −6 m 3 /mm。通过绘制Stribeck-like 曲线分析了润滑油的润滑机理。为了研 究合金的磨损行为,研制了磨损图。此外,还确定了安全磨损与严重磨损区域的分界线。在严重磨损 条件下,润滑油被挤压进入表面微裂纹,在裂纹壁上发生化学反应,生成相应的硫化物,阻止裂纹修 复,促进裂纹扩展,导致剥层。通过研制磨损图,为Cu-15Ni-8Sn 合金在油润滑条件下的应用提供了 指导。