稠化剂组分对润滑脂摩擦性能的影响  

Influence of Thickener Components on Friction Performance of Lubricating Grease

作　　者：潘伶[1,2] 吴允李 连金良 郑开魁[2] 郭锦阳 PAN Ling;WU Yunli;LIAN Jinliang;ZHENG Kaikui;GUO Jinyang(School of Advanced Manufacturing,Fuzhou University,Fujian Jinjiang 362251,China;School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学先进制造学院,福建晋江362251 [2]福州大学机械工程及自动化学院,福州350108

出　　处：《表面技术》2025年第5期83-92,共10页Surface Technology

基　　金：国家自然科学基金(52275178);福建省产学研合作项目(2020H6025)。

摘　　要：目的研究稠化剂组分中二元酸和硼酸对润滑脂在摩擦副表面润滑性能的影响。方法分别建立具有正弦曲面凸峰的粗糙面边界润滑系统模型,以及光滑壁面的反应力场边界润滑系统模型,通过分子动力学模拟方法研究12-羟基硬脂酸/壬二酸润滑脂体系(A润滑脂)、12-羟基硬脂酸/十二烷二酸润滑脂体系(B润滑脂)和12-羟基硬脂酸/壬二酸/硼酸润滑脂体系(C润滑脂)的承载能力、抗剪切能力、摩擦性能,并对C润滑脂进行成键和摩擦化学反应膜分析。结合润滑脂的微摩擦磨损试验,揭示二元酸链长和硼酸对润滑脂摩擦性能的影响。结果在加压阶段,随着压力的增加,润滑脂密度增大,且分层现象越明显。当压力Pz=50MPa时,组分中含硼酸的C润滑脂在各处的密度均较小,表现出最佳的承载能力。在剪切过程中,C润滑脂始终将2个粗糙峰隔开,油膜不破裂,承载能力最高;含长链二元酸的B润滑脂和含硼酸的C润滑脂的最大应力相较于A润滑脂,分别降低了27.1%、57.1%。同时,C润滑脂的摩擦因数相对稳定,在0.075~0.095范围内波动,其均值为0.090,相较于B润滑脂和A润滑脂,分别降低了16.7%、22.2%,具有优良的力学性能。摩擦磨损结果表明,在稠化剂组分中添加硼酸后,润滑脂的理化性能得到显著提升,摩擦因数及均值分别为0.085~0.095和0.091,模拟结果与试验结果一致。结论相较于稠化剂中含短链二元酸的润滑脂,含长链二元酸的润滑脂表现出较好的抗剪切能力和摩擦性能。在稠化剂中添加硼酸后,稠化剂的结构得到强化,润滑脂表现出更为优异的抗磨减摩性能。这是因为在硼酸的作用下,润滑脂中的锂皂和硼酸基团不仅形成了配位键,而且能在固体壁面上形成摩擦反应膜,显著提高了润滑脂的物理化学性能。The influence of dicarboxylic acid and boric acid in the thickening agent components on the lubrication performance of lubricating grease on the surface of friction pairs was studied.The rough surface boundary lubrication system models with sinusoidal convex peaks and smooth wall reaction force field boundary lubrication system models were established respectively.The molecular dynamics simulation method was used to study the load-bearing capacity,shear resistance,and friction performance of the 12-hydroxystearic acid&azelaic acid grease system(A lubricating grease),the 12-hydroxystearic acid&dodecanedioic acid grease system(B lubricating grease),and the 12-hydroxystearic&acid azelaic&acid boric acid grease system(C lubricating grease).At the same time,lubricating grease with the same composition and content as the simulated one was prepared according to common grease preparation methods.Bond formation and frictional chemical reaction film analysis were conducted on C lubricating grease.Finally,combined with micro friction and wear tests of lubricating grease,the effects of dicarboxylic acid chain length and boric acid on the friction performance of lubricating grease were revealed.The results indicated that as the pressure increased,the density of lubricating grease increased and the phenomenon of delamination became more and more obvious during the pressurization stage.C lubricating grease containing boric acid in the component had a lower density in all areas,exhibiting the best load-bearing capacity when the pressure Pz=50 MPa.During the shearing process,C lubricating grease always separated the two rough peaks,the oil film did not break,and the bearing capacity was the highest.The maximum stress values of the B lubrication system containing long-chain dicarboxylic acid and the C lubrication system containing boric acid were reduced by 27.1% and 57.1%,respectively,compared with lubricating grease A.In the meanwhile,the friction coefficient of C lubricating grease was relatively stable at 0.090,which was 16.7%

关 键 词：摩擦反应膜 稠化剂组分 摩擦性能 润滑脂 分子动力学 

分 类 号：TH117.2[机械工程—机械设计及理论]