【摘要】 为探究聚α-烯烃链长和石墨烯添加剂对聚α-烯烃(PAO)合成基础油摩擦性能的影响,采用分子动力学方法研究不同结构的PAO的摩擦学性能,分析PAO分子链长及石墨烯质量分数对润滑油与摩擦副接触面间的剪切应力、范德华能以及油膜厚度的影响。结果表明:石墨烯可以增加润滑油与摩擦副接触面间的范德华能,从而吸附更多润滑油分子,增加油膜厚度,降低剪切应力,提升润滑油减摩效果,且可使范德华能的变化更加平稳,提升润滑油吸附的稳定性;石墨烯对不同链长PAO的影响不同,对于短链PAO,石墨烯较低时就能起到很好的减摩效果,且减摩效果更加明显;而对于长链PAO,石墨烯含量较高时才能起到减摩效果。更多还原

【Abstract】 In order to investigate the effects of polyα-olefin (PAO) chain length and graphene additives on the tribological behaviors of synthetic base oil PAO,the tribological behaviors of PAO with different chain lengths were studied by molecular dynamics method.The effects of PAO molecular chain length and the mass fraction of graphene on the shear stress,van der Waals energy and oil film thickness between lubricating oil and rubbing pairs were studied.The results show that graphene can increase the van der Waals energy between the lubricating oil and the contact surface of the friction pair,so as to adsorb more lubricating oil molecules,increase the thickness of the oil film,reduce the shear stress and improve the anti-friction effect of the lubricating oil.The graphene also can make the change of van der Waals energy more stable and improve the adsorption stability of lubricating oil.The effects of graphene on PAO with different chain lengths are different.For the short chain PAO,a good anti-friction effect can be achieved only dding a small amount of graphene,the anti-friction effect is more obvious.However,for the long chain PAO,the anti-friction effect can be achieved only when the content of graphene is high.更多还原