纳米润滑添加剂改善摩擦磨损提高发动机性能的研究  

Improving Engine Performance Via the Addition of Nano-lubricating Additives to Reduce Friction and Wear

作　　者：侯献军[1,2] 王士成 MOHAMED KAMAL Ahmed Ali HOU Xianjun;WANG Shicheng;MOHAMED KAMAL Ahmed Ali(Hubei Key Laboratory of Advanced Technology for Automotive Components（Wuhan University of Technology）,Wuhan Hubei 430070,China;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan Hubei 430070,China)

机构地区：[1]现代汽车零部件技术湖北省重点实验室(武汉理工大学),湖北武汉430070 [2]汽车零部件技术湖北省协同创新中心,湖北武汉430070

出　　处：《润滑与密封》2018年第6期1-5,共5页Lubrication Engineering

基　　金：国家重点研发计划项目(2016YFC0204905)

摘　　要：以5W-30润滑油为基础油,Al_2O_3/TiO_2为纳米添加剂,配制添加剂质量分数为2%的纳米润滑油。通过摩擦学性能试验台模拟缸套-活塞环摩擦副实际工作过程,研究Al_2O_3/TiO_2纳米添加剂对摩擦学性能的改善;通过场发射扫描电镜(FESEM)对活塞环样本微观形貌进行观察,确定表面磨损情况;通过发动机台架实验研究确定实际使用工作过程中,纳米添加剂对发动机动力性能的影响。结果表明,润滑油中加入Al_2O_3/TiO_2纳米添加剂后,缸套-活塞环摩擦副摩擦磨损性能得到明显改善,摩擦因数和活塞环磨损率显著下降,摩擦因数最大下降50.6%,平均下降42%;活塞环磨损率最大下降34.8%,平均下降27.2%;活塞环表面微观形貌得到明显改善,磨损表面得到修复,划痕显著减少;在转速为4 400 r/min时随着负荷逐渐增大,发动机台架实验输出功率最高提升24.2%,低负荷功率增幅显著,高负荷范围内功率平均提升3.3%,动力性能得到较大提升。With 5 W-30 lubricant as base oil and Al2O3/TiO2 as mixed nano additive,nano lubricating oil was prepared by adding 2% mass fraction of Al2O3/TiO2 in the lubricant.The influence of Al2O3/TiO2 nano additive on the tribological properties of the lubricant was study by using the tribological performance rig test to simulate the actual working process of cylinder-piston ring assembly.The surface wear condition was analyzed by using the field emission scanning electron microscopy（ FESEM） to observe the morphology of piston ring sample.The influence of Al2O3/TiO2 nano additive on engine performance during the actual work process was studied by the engine bench test.The results show that the nano additive of Al2O3/TiO2 improves the friction and wear of cylinder-piston ring,and thefriction coefficient and the wear rate of piston ring is decreased significantly.The maximum decrease of friction coefficient is 50.6% and the average decrease is 42%,the maximum decrease of piston ring wear rate is 34. 8% and the average decrease is 27. 2%. The morphology of piston ring surface is improved and the worn surface is repaired and the scratches are significantly reduced.When the speed is 4 400 r/min,with the increasing of load,the output power of the engine bench test is up to 24. 2%. The power in low load is increased significantly and the power in high load range is increased by 3. 3%,the power performance is greatly improved.

关 键 词：润滑油 纳米添加剂 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]