表面氮化对活塞环摩擦磨损参数的影响分析

Analysis of Surface Nitriding Affecting the Ring Wear and Friction Parameters of Piston Ring

用摩擦磨损试验机对铸铁活塞环在氮化前后与高硼铜铸铁缸套配合分别进行了半小时和一小时摩擦磨损试验,测量了氮化前后的活塞环表面摩擦系数和磨损量、磨损率,并对磨痕进行了分析。结果表明:未氮化活塞环摩擦系数大于氮化环,摩擦系数变化稳定性比氮化活塞环差,未氮化环磨损量较氮化环增大了约39.6%(半小时)及51.0%(一小时),未氮化环磨损率的一小时试验比半小时试验平均升高6.7%,氮化环磨损率降低了13.7%,与未氮化环配合的缸套磨损量较与氮化环配合的缸套的磨损量和磨损率与活塞环比较规律一致,表面磨痕显示未氮化环磨损剧烈,由此氮化处理提高活塞环-缸套摩擦副的稳定性,且耐磨性得到提高。

Testing nitride piston ring and non-nitride piston ring with high boron copper cast iron cylinder with friction and wear testing machine in a half hour and one hour,it measured these two different piston rings＇ surface friction coefficient,wear volume,wear rate and analyzed the wear scar.The results show that non-nitride piston ring＇s friction coefficient is bigger than nitride piston ring’s friction coefficient,but no nitride piston ring’s friction coefficient is not very stable.The amount of non-nitride piston ring wear increased by about 39.6% higher than the nitride piston ring（half hour）and 51.0%（one hour）,and non-nitride piston ring＇s wear rate of the one hour test increased by about 6.7% than the half-hour test while the nitride piston ring＇s wear rate decreased by about 13.7%.The situation of the cylinders which are rubbing with these two different piston rings is same as the situation of piston rings.Surface grinding marks that nitride piston ring wear more Serious.So,nitrogen treatment can improve the stability of the pair of piston ring-cylinder liner friction,and wear resistance is improved.