P元素添加对Cu-15Ni-8Sn合金干摩擦磨损性能的影响

Effect of P addition on dry sliding wear properties of Cu-15Ni-8Sn alloy

研究Cu-15Ni-8Sn和Cu-15Ni-8Sn-0.2P合金在400℃下时效不同时间以及在不同法向载荷下的磨损行为,采用扫描电镜(SEM)和三维表面轮廓仪观察磨痕和磨屑颗粒的形貌及成分分布。结果表明:相对于Cu-15Ni-8Sn而言,Cu-15Ni-8Sn-0.2P合金具有更高的峰值硬度、抗过时效能力及耐摩擦磨损性能。时效后的Cu-15Ni-8Sn-0.2P合金在往复干摩擦过程中的磨损方式主要以磨粒磨损为主,但在400℃时效15 h时,Cu-15Ni-8Sn合金黏着磨损量增加,这与合金硬度的降低有关。两种合金磨损量的大小与合金的硬度成反比,与法向载荷成正比。此外,相对于Cu-15Ni-8Sn合金而言,Cu-15Ni-8Sn-0.2P合金具有更好的耐高载荷摩擦磨损性能。随着法向载荷增加,两种合金发生疲劳磨损的概率增加。

The wear behaviors of Cu-15Ni-8Sn and Cu-15Ni-8Sn-0.2P alloys aged at 400℃for different time and under different normal loads were studied.The morphology and composition distribution of wear marks and debris particles were observed by scanning electron microscopy(SEM)and three-dimensional surface profilometer.The results show that compared with Cu-15Ni-8Sn alloy,the Cu-15Ni-8Sn-0.2P alloy has higher peak hardness,over aging resistance and wear resistance.The wear modes of aged Cu-15Ni-8Sn-0.2P alloy during dry sliding wear are abrasive wear,oxidation wear and adhesive wear.However,the adhesion wear of Cu-15Ni-8Sn alloy increases after aged at 400℃for 15 h,which is related to the decrease of hardness.The wear losses of both the alloys are inversely proportional to the hardness and proportional to the normal load.In addition,compared with Cu-15Ni-8Sn alloy,Cu-15Ni-8Sn-0.2P alloy has better wear resistance under high load,and the minimum friction coefficient is 0.65 when the normal load is 100 N.Further,the probability of fatigue wear increases with the increase of normal load.