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.
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)
出处
《材料保护》
CAS
CSCD
2024年第3期80-87,共8页
Materials Protection
作者简介
通信作者:李楠(1989-),高级工程师,研究方向为核电设备失效原因分析,E-mail:linan6052960@126.com。
