烷基化石墨烯和有机钼的协同摩擦学性能研究

Study on the synergistic tribological properties of alkylated graphene and organic molybdenum

为提高石墨烯的摩擦学性能,研究了烷基化石墨烯(LTRGO)和有机钼类添加剂的协同抗磨减摩效应。采用四球摩擦磨损试验考察了LTRGO和MoDDP单独添加和复合添加量对基础油摩擦学性能的影响,结果表明,0.012%(质量分数)LTRGO和2.0%(质量分数)MoDDP复合添加后具有优异的协同抗磨减摩效应,与台塑100N基础油相比,其平均摩擦因数减小38.26%,磨痕直径减小61.79%。为适应国六标准对柴油发动机排放的要求,配制了含LTRGO/MoDTC和含MoDTC的柴油机润滑油,四球试验和台架试验结果表明,含LTRGO/MoDTC配制油的平均摩擦因数、磨痕直径分别比含MoDTC配制油的减小53.49%和8.84%,与壳牌CK-4柴油机成品油相当;在柴油发动机额定功率点工况下,使用含LTRGO/MoDTC配制油的发动机尾气中的CO、HC、颗粒物、CO_(2)排放量分别比使用CK-4成品油的减少11.76%,17.39%,12.93%,3.46%,仅NO增加5.71%。提示LTRGO/MoDTC复合抗磨剂的协同抗磨减磨效应明显,促进了燃油充分燃烧,减少了发动机排放。

In order to improve the tribological properties of graphene,the synergistic anti-wear and friction reduction effects of alkylated graphene(LTRGO)and organic molybdenum additives was studied.The influence of the additive amount of LTRGO and MoDDP alone and compound on the tribological properties of the base oil was investigated by using the four-ball friction and wear test.The results showed that the compound addition of 0.012%LTRGO and 2.0%MoDDP had excellent synergistic anti-wear and friction reduction effects.Compared to Formosa Plastics 100N base oil,the average friction coefficient decreased by 38.26%,and the wear scar diameter decreased by 61.79%.In order to meet the requirements of ChinaⅥstandard for diesel engine emissions,the diesel engine lubricating oil containing LTRGO/MoDTC and MoDTC was formulated,respectively.The results of four-ball test and engine bench test showed that the average friction coefficient and wear scar diameter of the containing LTRGO/MoDTC formulated oil were reduced by 53.49%and 8.84%compared with that of the containing MoDTC formulated oil,respectively,and they were the same as those of Shell CK-4 refined oil products.Under the rated power point condition of the diesel engine,the emissions of CO,HC,particulate matter and CO_(2)in the engine exhaust using the formulated oil were reduced by 11.76%,17.39%,12.93%and 3.46%compared with those of using CK-4 diesel oil,respectively,and only NO increased by 5.71%.It indicates that the synergistic anti-wear and friction reduction effects of LTRGO/MoDTC composite anti-wear additive is obvious,which promotes full fuel combustion and reduces engine emissions.