有机钼对低黏度润滑油摩擦学性能的影响

Influence of Organic Molybdenum on the Tribological Property of Low-viscosity Oil

目的制备一种非活性油溶性有机钼添加剂(SPFMo)以为满足汽油发动机润滑油低黏度化发展的需求。方法将SPFMo添加到0W–20润滑油中,利用SRV摩擦磨损试验机详细分析了在不同温度、载荷条件下,自研减摩剂SPFMo、商用减摩剂Molyvan855和商用抗磨剂MOM201在0W–20中摩擦学性能的影响,并采用3D激光共聚焦显微镜和扫描电子显微镜对摩擦副表面进行分析。结果SPFMo具有良好的减摩抗磨性能,并有效降低润滑油0W–20的摩擦因数及磨损率。摩擦过程中钼元素会发生富集,并发生摩擦化学反应生成包含硫–钼–氧的复合减摩片层,实现减摩抗磨功能。SPFMo添加到0W–20中可以发挥良好摩擦学性能的使用温度区间和载荷区间分别为80~180℃和150~250 N(1559~1848 MPa)。0W–20+1%SPFMo与润滑油0W–20相比,在130℃、200 N下,摩擦因数降低13.28%,磨损率降低37.91%;在130℃、250 N下,摩擦因数降低18.05%,磨损率降低57.68%。0W–20+1%SPFMo润滑油的摩擦因数随温度的升高先减小后增大,随载荷的增大而减小;磨损率随温度的升高先减小后增大,随载荷的增大而减小。结论低黏度润滑油中添加SPFMo可有效增强其摩擦学性能。

In order to meet the demand of low viscosity lubricating oil for gasoline engine,a kind of sulfur-and phosphorus-free organic molybdenum(SPFMo)was synthesized and added into the low viscosity lubricating oil 0W-20.Moreover,the influence of self-developed anti-friction agent SPFMo,commercial anti-friction agent Molyvan855 and commercial antiwear agent MOM201 on the tribological properties of 0W-20 under different temperatures and loads was studied in detail.The microstructure and composition of worn surface was observed by SEM and 3D laser scanning microscope.The results show that the SPFMo shows good anti-friction and anti-wear performances,both the friction factor and wear rate of 0W20 can be decreased.During the friction process,the molybdenum is enriched and has the function of anti-friction and anti-wear.The elements of molybdenum,sulfur,oxygen are the main elements of the lubricating film.The temperature and load conditions in which the SPFMo can show great tribological performance are 80-180℃and 150-250 N(1559-1848 MPa),respectively.When the temperature is 130℃and the load is 200 N,the friction factor and wear rate of 0W-20 can be decreased by 13.28%and 37.91%by the addition of SPFMo.And when the temperature is 130℃and the load is 250 N,they can be decreased by 18.05%and 57.68%,respectively.The friction factor of 0W20+1%SPFMo decreases firstly and then increases with the increase of the temperature,and decreases with the increase of the load.The wear rate of 0W20+1%SPFMo decreases firstly and then increases with the increase of the temperature,and decreases with the increase of the load.Finally,the results can be helpful for adding sulfur-and phosphorus-free organic molybdenum for engine oils with low viscosity.