摘要
采用SRV®4型多功能摩擦磨损试验机,使用四面体非晶碳(tetrahedral amorphous carbon,ta-C)涂层/活塞环—缸套摩擦副,研究了不同含量二烷基二硫代氨基甲酸钼(molybdenum dialkyl dithiocarbamate,MoDTC)SN/GF—50W—20发动机油摩擦学性能。研究结果表明,MoDTC明显影响ta-C涂层/活塞环—缸套摩擦副摩擦学性能,当Mo元素质量分数在0.03%~0.05%范围内时摩擦磨损性能最优;而当Mo元素质量分数为0.10%时摩擦磨损性能最差。在相同摩擦磨损试验条件下,研究Yubase4+基础油(Yubase4+,Yu4+)对照组、Yu4+/MoDTC和Yu4+/MoDTC/二烷基二硫代磷酸锌(zinc dialkyl dithiophosphate,ZDDP)润滑体系对ta-C涂层/活塞环—缸套摩擦副影响,并用扫描电子显微镜(scanning electron microscope,SEM)、X射线光电子能谱仪(X-ray photoelectron spectroscopy,XPS)对缸套磨损表面进行分析。研究结果表明,Yu4+/MoDTC体系摩擦系数最低,而Yu4+/MoDTC/ZDDP体系摩擦系数最高。这可能是因为ta-C材质活塞环硬度高,Yu4+/MoDTC/ZDDP润滑体系缸套摩擦膜中含有ZDDP自分解产物及与MoDTC、缸套表面作用产物(如MoO_(3)、ZnS、Fe_(3)O_(4)、ZnO等),摩擦膜中磨粒大小不均匀在对偶间的摩擦造成较高的磨粒磨损,从而引起摩擦系数增加。
The tribological properties of SN/GF—50W—20 engine oil with different content of molybdenum dialkyl dithiocarbamate(MoDTC)were studied on tetrahedral amorphous carbon(ta-C)coating/piston ring–cylinder friction pair by using SRV®4 multifunctional friction and wear tester.The research results show that MoDTC significantly affects the tribological properties of ta-C coating/piston ring–cylinder liner.When the content of Mo element is in the range of 0.03%~0.05%by weight,the friction and wear performance is the best.And when the content of Mo element is 0.10%by weight,the friction and wear performance is the worst.The effects of Yu4+base oil/control group,Yubase4+(Yu4+)/MoDTC and Yu4+/MoDTC/zinc dialkyl dithiophosphate(ZDDP)lubrication systems on ta-C coating/piston ring–liner friction pairs were studied under the same friction and wear experiment conditions,and the wear step was analyzed by scanning electron microscope(SEM)and X-ray photoelectron spectroscopy(XPS).The results show that the friction coefficient of the Yu4+/MoDTC system is the lowest,while that of the Yu4+/MoDTC/ZDDP system is the highest.This may be due to the high hardness of ta-C coating.The friction film of the cylinder liner of the Yu4+/MoDTC/ZDDP lubrication system contains ZDDP self-decomposition products and products that interact with MoDTC and the surface of the cylinder liner(such as MoO_(3),ZnS,Fe_(3)O_(4),ZnO,etc.).The uneven size of the abrasive particles in the friction film causes higher abrasive wear between the pairs,which causes the friction coefficient increasing.
作者
鄂红军
杜雪岭
阿合波塔·巴合提
金佳佳
E Hongjun;DU Xueling;Ahebota·Baheti;JIN Jiajia(Beijing Research Institute of Sinopec Lubricants Co.,Ltd.,Beijing 100085,China)
出处
《内燃机工程》
CAS
CSCD
北大核心
2022年第3期52-56,共5页
Chinese Internal Combustion Engine Engineering
