碳酸钙纳米颗粒复合超分子凝胶润滑剂的摩擦学性能研究  

Tribological Properties of a Composite Lubricant CaCO_(3)-Supramolecular

作　　者：白艳艳 于强亮[1] 梁永民[3] 周峰[1] 蔡美荣[1,4] 刘维民 BAI Yanyan;YU Qiangliang;LIANG Yongmin;ZHOU Feng;CAI Meirong;LIU Weimin(State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Chemistry and Chemical Engineering,Lanzhou University,Gansu Lanzhou 730000,China;Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering,Shandong Yantai 264000,China)

机构地区：[1]中科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 [2]中国科学院大学,北京100049 [3]兰州大学化学化工学院,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》2022年第1期2-13,共12页Tribology

基　　金：国家自然科学基金(21972153,52075524);中国科学院青年创新促进会(2018454);载人航天预研究项目(040101);兰州化物所青年科技工作者协同创新联盟合作基金项目(YJGL20-01)资助。

摘　　要：采用碳酸钙纳米颗粒与全氟聚醚型超分子凝胶复合得到了一种新型的纳米颗粒复合超分子凝胶润滑剂.超分子凝胶具有错综复杂的网络结构,有效地提高了碳酸钙纳米颗粒在全氟聚醚润滑油中的分散稳定性.此外,碳酸钙纳米颗粒作为添加剂极大地提高了超分子凝胶的润滑性能,使其表现出较好的耐高温性能,以及较高的承载力.采用差式扫描量热仪、热重分析仪和流变分析仪对该复合润滑剂的热力学性能进行表征,结果显示该复合润滑剂具有很好的热稳定性以及较好的力学性能.最后,通过X射线光电子能谱(XPS)对其摩擦机理进行表征,结果表明碳酸钙纳米颗粒复合超分子凝胶润滑剂优异的摩擦学性能可归因于碳酸钙纳米颗粒在摩擦副表面形成了易剪切的薄膜,以及小尺寸的纳米粒子在摩擦过程中对摩擦表面进行的自修复效应.A new breed of lubricant using CaCO_(3)nanoparticles as an additive for PFPE-supramolecular gels(CaCO_(3)-supramolecular composite)was fabricated successfully.It aimed to solve the problems that nanoparticles with excellent anti-wear and anti-friction performance as additives were insoluble into PFPE oils,which limited the application of nanoparticles in the field of aerospace lubricant.Many researchers have found that gelators self-assembled in the liquid(water,organic solvent,oils)to form complicated 3-D networks that have spatial confinement effect for nanoparticles,which could increase the dispersion stability of CaCO_(3)nanoparticles in PFPE oil.Nature precipitation was used to explore the dispersion stability of CaCO_(3)nanoparticles with a diameter of 100 nm as a lubricant additive in PFPEsupramolecular gels.The results showed that the network of PFPE-supramolecular gels had good spatial confinement effect for CaCO_(3)nanoparticles and it would not self-aggregate even after 3 months.In addition,the thermostability and mechanical strength of PFPE-supramolecular gels were improved due to the excellent thermal and mechanical stability of nanoparticles.The thermostability was evaluated by differential scanning calorimetry(DSC)and(thermal gravimetric analyzer)TG.The results showed that the sol-gel transition temperature of CaCO_(3)-supramolecular composite and PFPEsupramolecular gels were about 123℃,which indicated the CaCO_(3)nanoparticles had no effect on the gelation property of PFPE-supramolecular gels.However,the TG results showed that the thermal decomposition temperature of CaCO_(3)-supramolecular composite(269℃)was higher than PFPE-supramolecular gels(260℃)due to the participation of CaCO_(3)nanoparticles.The rheological property of CaCO_(3)-supramolecular composite was expressed by rheometer,which showed high shear strength,shear thinning and good creep-recovery properties.The shear strength of CaCO_(3)-supramolecular composite(180 Pa)was much higher than PFPE-supramolecular gels(56 Pa),which was

关 键 词：碳酸钙纳米颗粒复合超分子凝胶润滑剂 分散稳定性 摩擦学性能 全氟聚醚润滑油 

分 类 号：TH117.22[机械工程—机械设计及理论]