速度与载荷对无铅铜铋轴承材料摩擦学特性的影响

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Lead-free copper-bismuth bearing material was prepared by powder metallurgy method. Friction and wear tests were conducted using the HDM-20 tribometer under oil lubrication conditions. Effects of friction speed and load on its tribological performance were analyzed. The results show that the friction coefficient decreases, the mass wear loss and the friction surface temperature increase with the increase of friction speed and load; Bi with lower melting point can be melted and move to the surface, which results in good performances of anti-friction and anti-adhesion, and there is a cycle of bismuth melting, precipitation and shedding.采用粉末冶金法制备无铅铜铋双金属轴承材料，并在HDM．20端面摩擦磨损实验机上进行油润滑条件下的摩擦磨损试验，分析速度、载荷对其摩擦学性能的影响。结果表明：摩擦因数随摩擦速度、载荷的增加而减小，其磨损量、摩擦副表面温度均随速度、载荷的增加而增大；摩擦磨损过程中低熔点组元铋的析出起着较好的减摩、抗粘着作用，并存在铋的析出、熔化、磨损脱落的循环过程。