ZCuPb20Sn5合金耐磨性能研究

ZCuPb₂₀Sn₅合金作为柱塞泵转子内衬材料，因其含铅量高，而具有良好的减摩耐磨性能，可避免转子在工作中的磨损失效问题. 选用销盘式摩擦磨损试验机，以ZCuPb₂₀Sn₅和45钢为摩擦副，研究了不同PV值和油润滑条件下，ZCuPb₂₀Sn₅合金的摩擦磨损性能. 结果表明:随着PV值的增加，ZCuPb₂₀Sn₅合金的摩擦系数先增加后减小，而磨损率呈增加趋势. 在载荷50 N和线速度2.410 m/s条件下，摩擦系数和磨损率最低，摩擦系数最低能达到0.010，平均摩擦系数达到1个最低峰值点0.063；在载荷250 N、线速度3.610 m/s以及PV值为126 MPa·m/s的条件下，摩擦系数达到另一低峰值0.070，磨损率为2.972×10?7 mm3/(N·m). PV值最大时，摩擦系数和磨损率最大. 载荷小于150 N时，在油润滑的作用下，主要磨损机制为轻微黏着磨损；载荷大于150 N时，在铅和油的协同作用下，以黏着磨损为主，少量磨粒磨损；当载荷大于250 N时，摩擦系数与磨损率均偏高，以磨粒磨损为主，局部有少量氧化磨损. 

Wear Resistance of ZCuPb20Sn5 Alloy

The ZCuPb₂₀Sn₅ alloy, as the lining material of the plunger pump rotor, has exceptional anti-friction and wear resistance due to its high content of lead, which prevent the rotar from wear failure during the operation. Pin-disk friction and wear testing machine was applied in this study. ZCuPb₂₀Sn₅ alloy and 45 steel were selected as the friction pair to study the lubricated tribological properties of ZCuPb₂₀Sn₅ under different PV values. The results showed that the wear rate and friction coefficient increased firstly and then decreased, while the wear rate increased with the increasing PV values. Under a load of 50 N and a speed of 2.410 m/s, the wear rate and friction coefficient (0.010) were the lowest, and the average friction coefficient was as low as 0.063. Under a load of 250 N, a speed of 3.610 m/s and 128 MPa·m/s PV value, the friction coefficient was as low as 0.070, and the wear rate was 2.972×10?7 mm3/(N·m). Under the maximum PV value, the friction coefficient and wear rate were the highest. Under the loads lower than 150 N, the main wear mechanism was mild adhesive wear. Under the loads higher than 150 N, because of the synergistic effect of lead and oil, the wear mechanism was mainly adhesive wear accompanied by mild abrasive wear. Under the loads higher than 250 N, both the friction coefficient and wear rate were high, and the mechanism was mainly abrasive wear and mild oxidation wear.