Well-Dispersed Graphene Enhanced Lithium Complex Grease Toward High-Efcient Lubrication

作     者：Kaiyue Lin Zhuang Zhao Yuting Li Zihan Zeng Xiaofeng Wei Xiaoqiang Fan Minhao Zhu Kaiyue Lin;Zhuang Zhao;Yuting Li;Zihan Zeng;Xiaofeng Wei;Xiaoqiang Fan;Minhao Zhu

作者机构：Key Laboratory of Advanced Technologies of Materials(Ministry of Education)School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Tribology Research InstituteSchool of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2023年第36卷第5期

页      面：341-352页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：Supported by National Natural Science Foundation of China(Grant Nos.52075458 and U2141211) 

主　　题：Graphene additive Lithium complex grease Dispersion Tribological properties 

摘      要：Graphene as a lubricating additive holds great potential for industrial lubrication. However, its poor dispersity and compatibility with base oils and grease hinder maximizing performance. Here, the infuence of graphene dispersion on the thickening efect and lubrication function is considered. A well-dispersed lubricant additive was obtained via trihexyl tetradecyl phosphonium bis(2-ethylhexyl) phosphate modifed graphene ([P_(66614)][DEHP]-G). Then lithium complex grease was prepared by saponifcation with 12-OH stearic acid, sebacic acid, and lithium hydroxide, using polyalphaolefn (PAO20) as base oil and the modifed-graphene as lubricating additive, with the original graphene as a comparison. The physicochemical properties and lubrication performance of the as-prepared greases were evaluated in detail. The results show that the as-prepared greases have high dropping point and colloidal stability. Furthermore, modifed-graphene lithium complex grease ofered the best friction reduction and anti-wear abilities, manifesting the reduction of friction coefcient and wear volume up to 18.84% and 67.34%, respectively. With base oil overfow and afux, well-dispersed [P_(66614)][DEHP]-G was readily adsorbed to the worn surfaces, resulting in the formation of a continuous and dense graphene deposition flm. The synergy of deposited graphene-flm, spilled oil, and adhesive grease greatly improves the lubrication function of grease. This research paves the way for modulating high-performance lithium complex grease to reduce the friction and wear of movable machinery.