温度对电沉积纯银镀层和纯银/银石墨复合镀层磨损性能和行为的影响

本文中使用电沉积方法在铜基表面分别制备了纯银镀层和纯银/银石墨复合镀层,研究了不同温度下两种镀层的磨损性能和行为.研究表明:室温至120℃,纯银镀层磨损机理为轻微的黏着磨损,摩擦系数稳定在0.35~0.45左右,磨损率为3×10~(-14) m~3/(N·m)左右;240~480℃,镀层磨损机理为明显的黏着磨损,磨损率急剧增加,摩擦系数不稳定.纯银/银石墨复合镀层在室温至240℃的磨损机理为轻微的黏着磨损,平均摩擦系数在0.1左右,磨损率增加缓慢;当温度超过240℃时,由于抗高温石墨膜的破裂,出现了严重的塑性变形;480℃时,复合镀层磨损机理主要表现为明显的磨粒磨损,摩擦系数不稳定,磨损率达到46×10~(-14) m~3/(N·m),耐磨性优于纯银镀层.

The Effect of Temperature on Wear Resistance and Behavior of Pure Silver and Silver/Silver-Graphite Composite Coatings Prepared by Electro-Deposition

The pure silver and silver/silver-graphite composite coatings on the substrate of copper were prepared by electro-deposition.The wear resistance and behavior of the pure silver and silver/silver-graphite composite coatings at different processing temperature were investigated.The wear mechanism of pure silver coating at room temperature to 120 ℃ was the mild adhesive wear,the friction coefficient and wear rate was about 0.35～0.45 and 3×10-14 m3/(N.m),respectively.At 240～480 ℃,the wear mechanism of pure silver coating was adhesive wear and its wear rate increased rapidly and friction coefficient was instable.The wear mechanism of pure silver/silver-graphite composite coating at room temperature to 240 ℃ was the mild adhesive wear,its friction coefficient was about 0.1 and wear rate increased slowly with temperature.At temperature between 240 ℃ and 480 ℃,the severe plastic deformation appeared on the composite coating due to the fracture of the graphite film at high temperature.At 480 ℃,the wear mechanism of composite coating was mainly abrasive wear,its friction coefficient was instable and the wear rate of the composite coating was 46× 10-14 m3/(N·m),indicating the wear resistance of high temperature was better than that of the pure silver coating.