有机无灰减摩剂对流体动压润滑减摩性能影响机制  

Influence Mechanism of Ashless Organic Friction Modifier to the Hydrodynamic Lubrication Performance

作　　者：尤越 马建冬 王维伟 YOU Yue;MA Jiandong;WANG Weiwei(Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China;Ocean School,Yantai University,Yantai Shandong 264005,China)

机构地区：[1]中国船舶集团有限公司第七一一研究所,上海201108 [2]烟台大学海洋学院,山东烟台264005

出　　处：《润滑与密封》2024年第7期129-133,共5页Lubrication Engineering

基　　金：国家自然科学基金项目(52201383);山东省自然科学基金项目(ZR2019BEE073)。

摘　　要：有机无灰减摩剂能减低流体动压润滑摩擦因数,对提升流体动压润滑性能提供了新思路。采用单油酸甘油酯、油酸、季戊四醇四异硬脂酸酯、司盘80作为有机无灰减摩剂,以质量分数5%与PAO 5基础油进行调和,制备4种不同润滑油样,采用流体动压润滑试验机对比其摩擦学性能。试验结果表明,有机无灰减摩剂在边界润滑和混合润滑中均具有一定减摩效果,在流体动压润滑下减摩效果更明显。其中,含质量分数5%季戊四醇四异硬脂酸酯的油样具有最佳的减摩作用,其在流体动压润滑状态下可使基础油的摩擦因数降低19.6%。分子动力学模拟结果显示,有机无灰减摩剂在摩擦表面产生滑移现象,减少了分子间碳链的相互缠绕,进而降低流体动压润滑下的摩擦因数。Ashless organic friction modifier can reduce the friction coefficient of hydrodynamic lubrication,which provide new idea to improve the hydrodynamic lubrication performance.The monoolein glycerol,oleic acid,pentaerythritol tetraisostearate and Span 80 were used as ashless friction modifier.Four kinds of lubricant samples were prepared by mixing 5%mass fraction of ashless friction modifier with base oil PAO 5,and their hydrodynamic lubrication performances were studied by fluid dynamic pressure lubrication test rig.Results show that the ashless friction modifiers have certain friction reduction effects under boundary lubrication and mixed lubrication,while the friction reduction effect is more significant under hydrodynamic lubrication.The lubricant containing 5%mass fraction of pentaerythritol tetraisostearate shows the best friction reduction performance,which reduces the friction coefficient of hydrodynamic lubrication by 19.6%compared with base oil.Molecular dynamic simulation results show that the ashless friction modifier produces boundary slip phenomenon on friction surface,reduces the intertwine of carbon chains between molecules,and thus reduces the friction coefficient under hydrodynamic lubrication.

关 键 词：有机无灰减摩剂 流体动压润滑 摩擦因数 边界滑移 

分 类 号：TH117[机械工程—机械设计及理论]