单油酸甘油酯改性凹凸棒石作为润滑油添加剂的摩擦自修复性能研究  

Tribological Self-Repairing Performance of Single Oleic Glycerol Ester-Modified Attapulgite as a Lubricant Additive

作　　者：牛宇琦 乐凯 许江 柳宇震 张建军 车清论 徐书生[2,4] 王爱勤 刘维民[2] NIU Yuqi;LE Kai;XU Jiang;LIU Yuzhen;ZHANG Jianjun;CHE Qinglun;XU Shusheng;WANG Aiqin;LIU Weimin(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;Key Laboratory of Clay Mineral Applied Research of Gansu Province,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai,Shandong Yantai 264000,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]中国科学院兰州化学物理研究所甘肃省黏土矿物应用研究重点实验室,甘肃兰州730000 [4]烟台先进材料与绿色制造山东省实验室,山东烟台264000

出　　处：《摩擦学学报(中英文)》2025年第3期409-420,共12页Tribology

基　　金：中国科学院兰州化学物理研究所青年科技工作者协同创新联盟合作基金项目(HZJJ22-03);国家自然科学基金项目(52075521);山东省自然科学基金优秀青年基金项目(海外)(2022HWYQ-096);山东省自然科学基金项目(ZR2022QE162,ZR2022ME200);中国科学院先导专项(XDB0470102)资助.

摘　　要：采用SRV高频往复摩擦试验机考察了单油酸甘油酯改性凹凸棒石作为PAO6润滑油添加剂对GCr15钢摩擦副摩擦磨损性能的影响.通过扫描电子显微镜、透射电子显微镜、X射线能谱仪、共聚焦显微镜、X射线光电子能谱仪等对磨痕的表面形貌、元素与物相组成等进行了分析,探究了摩擦行为驱动下凹凸棒石添加剂修复磨痕表面的作用机制.结果表明,单油酸甘油酯改性的凹凸棒石作为PAO6润滑油添加剂能够显著改善GCr15钢的摩擦学性能,摩擦系数降低了57.1%,磨损率显著降低了86.3%,这是由于单油酸甘油酯具有良好的减摩作用,凹凸棒石在磨痕表面形成高耐磨的修复膜,使其耐磨性获得显著提高.进一步研究发现,凹凸棒石只有在较高载荷下容易发生摩擦化学反应,从而形成1层由底部铁的氧化物为支撑主体、上部硅酸盐与硬质陶瓷物相及少量碳等构成的复合修复膜,修复膜优先在犁沟处沉积并逐渐向整个摩擦接触界面扩散生长.Attapulgite is a water-containing magnesium-aluminum-rich silicate clay mineral with one-dimensional rodlike morphology,the structural layer is composed of two layers of silica-oxygen tetrahedra and one layer of magnesiumoxygen octahedra.The unique layer-chain microporous structure enable sit to utilize the mechanical energy released from the friction process to generate physicochemical interactions in the lubricant medium to form a layer of oxidebased metal-ceramic self-healing film with high hardness,high strength and smoothness.It can achieve the healing effect on the worn surface and thus improve the tribological properties of the metal-based materials.It has been reported that as an additive in lubricant oils or greases,attapulgite fibers have been shown to be effective in reducing the friction and wear of steel contacts.As a result,layered silicate minerals are attracting more attention for their excellent tribological properties,simple processing,low cost and environmental friendliness in industry.They are expected to be an alternative to conventional antiwear additives containing contaminant elements such as S,P and Cl,and can be used in engines,transmissions,large industrial equipment and other lubrication systems to achieve energy savings and maintain reliability.Previous studies on attapulgite have mainly focused on its effect on its tribological properties,however,the research on its anti-wear and the self-repairing mechanism on the worn surface,especially its micro-mechanism for antiwear repair of metal friction substitutes,has not been sufficiently investigated.In this study,the effects of incorporating glycerol monooleate-modified attapulgite into PAO6 base oil on the friction and wear characteristics of GCr15 steel tribopairs were thoroughly investigated.Employing an SRV high-frequency reciprocating tribometer,a comprehensive analysis was conducted.Various analytical techniques,including scanning electron microscopy,energy dispersive X-ray spectroscopy,transmission electron microscopy,confocal spe

关 键 词：凹凸棒石 单油酸甘油酯改性 润滑油添加剂 摩擦行为 修复膜 

分 类 号：TH117.1[机械工程—机械设计及理论]