不同有机酸配比对复合钛基润滑脂性能的影响规律  

Influence Rules of Ratio of Organic Acids on Performance of Titanium Complex Grease

作　　者：刘宁波 李毅[2,3] 车清论 胡丽天 张建军[1] 张松伟 LIU Ningbo;LI Yi;CHE Qinglun;HU Litian;ZHANG Jianjun;ZHANG Songwei(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Shandong Qingdao 266520,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Qingdao Center of Resource Chemistry&New Materials,Shandong Qingdao 266071,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [3]青岛市资源化学与新材料研究中心,山东青岛266071

出　　处：《摩擦学学报（中英文）》2024年第10期1383-1393,共11页Tribology

基　　金：国家自然科学基金项目(U21A20280);山东省自然科学基金项目(ZR2020ME135,ZR2022ME200);中国科学院青年创新促进会项目(2023444)资助。

摘　　要：采用苯甲酸、硬脂酸、钛酸异丙酯和环烷基矿物油4016为原料,通过改变硬脂酸和苯甲酸2种有机酸的比例制备了复合钛基润滑脂,系统的研究了其理化性能、流变学性能和摩擦学性能.流变学试验结果表明:增大硬脂酸比例,可以提高润滑脂的结构强度.当硬脂酸与苯甲酸摩尔比为2:1(TCG3)时,样品的屈服应力达到最大值2530 Pa.摩擦学试验结果表明:当硬脂酸与苯甲酸摩尔比为1:1(TCG4)时,所制备的复合钛基润滑脂具有最佳的摩擦学性能,平均摩擦系数为0.089,磨斑直径为0.57 mm,最大无卡咬负荷(PB)值为490 N,摩擦学性能明显优于复合锂基润滑脂KK-311(平均摩擦系数为0.108,磨斑直径为0.81 mm,最大无卡咬负荷为98 N).说明TCG4不仅具有优异的减摩抗磨性能,而且具有良好的承载能力.综合上述结果,通过改变硬脂酸和苯甲酸的摩尔比例获得了结构强度高和摩擦学性能优的复合钛基润滑脂产品,表明可以通过改变有机酸的比例优化复合钛基润滑脂的综合性能,为高性能复合钛基润滑脂的结构调控和基础性能研究提供技术支持,促进其在润滑工程领域的应用.Several kinds of titanium complex greases(TCG)were synthesized with the benzoic acid(BA),stearic acid(SA),isopropyl titanate and naphthenic mineral base oil(4016)by varying the molar ratio of BA to SA.The results of FTIR indicated these grease samples were successfully synthesized.The physicochemical properties,rheological behaviors and tribological performances were systematically investigated,and results showed that TCG1,TCG6 and TCG7 could not form grease,while TCG2,TCG3,TCG4 and TCG5 greases were successfully prepared.It demonstrated that the molar ratio of BA and SA had a significant influence on the microstructure and the formation mechanism of the titanium complex grease.The TCG2,TCG3 and TCG4 grease samples performed good physicochemical properties,such as,low penetration value,low oil separation under pressure and high dropping point.However,TCG5 exhibited poor physicochemical properties,such as,large penetration value and low dropping point.The rheological behaviors of titanium complex grease were measured by rotational rheometer,and these rheological parameters,including apparent viscosity and viscoelastic properties were tested.The apparent viscosity of TCG1,TCG6 and TCG7 changed little with the increase of shear rate,which further proved that they behaved more like Newtonian fluids.The apparent viscosity of TCG2,TCG3,TCG4 and TCG5 gradually decreased and finally tended to be stable with the increase of shear rate,which showed obvious shear thinning characteristics.The results of viscoelastic tests of TCG2,TCG3,TCG4 and TCG5 showed that the shear stress at flow point of TCG3 was the highest,followed by TCG2,TCG4 and TCG5,demonstrating the highest structural strength of TCG3.The microstructures of TCG were studied by scanning electron microscope,and results showed that as the SA content increased,the microstructure of thickeners changed from granular pattern with pores to dense fiber pattern,which could be ascribed to that long alkyl chains of SA were entangled with each other to form dense fibrous thi

关 键 词：复合钛基润滑脂 有机酸比例 结构强度 流变学性能 摩擦学性能 

分 类 号：TH117.2[机械工程—机械设计及理论]