活塞环表面MoS_(2)薄膜在干摩擦和贫油润滑条件下的摩擦学性能研究  

Tribological Properties of MoS_(2) Films on Piston Ring Surface under Dry Friction and Lean Oil Lubrication

作　　者：李楠 车银辉 王铭昌 LI Nan;CHE Yinhui;WANG Mingchang(Suzhou Nuclear Power Research Institute Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]苏州热工研究院有限公司,广东深圳518000

出　　处：《材料保护》2024年第3期80-87,共8页Materials Protection

摘　　要：大功率、长冲程和高爆发压柴油机是交通运输、工程机械、国防装备和核电应急发电机领域的重要动力设备。柴油机关键运动副活塞环-缸套在冷/热启动时,缸套的上下止点位置处于干摩擦或贫油润滑状态,易发生局部异常磨损导致动力性能丧失。为抑制活塞环-缸套运动副的异常磨损,采用磁控溅射技术在活塞环表面制备了MoS_(2)薄膜;利用SRV-IV微动摩擦磨损试验机模拟柴油机频繁冷/热启动工况,评价了表面附加MoS_(2)薄膜的活塞环与缸套摩擦副的摩擦学性能;利用扫描电镜(SEM)表征了MoS_(2)薄膜微观结构和摩擦前后摩擦副的表面形貌。结果表明:相比于原始CKS活塞环-缸套,MoS_(2)薄膜活塞环-缸套在干摩擦条件下的摩擦系数从1.07大幅降低至0.11,缸套磨损率从8.61×10^(-6) mm^(3)/(N·m)降低至3.71×10^(-8) mm^(3)/(N·m);在常温贫油条件下摩擦系数从0.18降低至0.11,磨损率从1.43×10^(-7) mm^(3)/(N·m)降低至3.22×10^(-8) mm^(3)/(N·m);在高温贫油条件下摩擦系数从0.12降低至0.08,磨损率从7.08×10^(-8) mm^(3)/(N·m)降低至1.12×10^(-8 )mm^(3)/(N·m);摩擦过程中活塞环表面MoS_(2)薄膜的转移是摩擦副摩擦学性能提升的主要原因。Diesel engines with large power,long stroke and high explosive pressure are the main power equipment for the fields of transporta-tion,construction machinery,national defense equipment and nuclear emergency generators.During cole/hot start of the key kinematic pair piston ring-cylinder liner of a diesel engine,the upper and lower dead center positions of the cylinder liner are in a dry friction or lean oil lubrication state,which is prone to local abnormal wear and loss of power performance.In order to suppress the abnormal wear of piston ring-cylinder liner kinematic pair,MoS_(2) thin films were prepared on the surface of the piston ring by magnetron sputtering technology.The friction and wear performance of the friction pair of the piston ring,with MoS_(2) thin film added on its surface,and cylinder liner was evaluated using the SRV-IV micro motion friction and wear tester to simulate frequent cold/hot start conditions of diesel engines.Moreover,scanning electron microscopy(SEM)was used to characterize the microstructure of the MoS_(2) film and the surface morphology of the friction pair before and after friction.Results showed that compared with the original CKS piston ring and cylinder liner,the friction coefficient of MoS_(2) film piston ring-cylinder liner under dry friction condition was greatly reduced from 1.07 to 0.11,and the wear rate of cylinder liner was reduced from 8.61×10^(-6) mm^(3)/(N·m)to 3.71×10^(-8)mm^(3)/(N·m).Under normal temperature and lean oil condition,the friction coefficient decreased from 0.18 to 0.11,and the wear rate decreased from 1.43×10^(-7) mm^(3)/(N·m)to 3.22×10^(-8) mm^(3)/(N·m).Under high temperature and lean oil condition,the friction coefficient declined from 0.12 to 0.08,and the wear rate was reduced from 7.08×10^(-8) mm^(3)/(N·m)to 1.12×10^(-8) mm^(3)/(N·m).Besides,the transfer of MoS_(2) films on the surface of the piston ring during the friction process was the main reason for the improvement of the tribological performance of the friction pair.

关 键 词：活塞环-缸套 MoS_(2)薄膜 磁控溅射 摩擦磨损性能 

分 类 号：TH117.1[机械工程—机械设计及理论]