摘要
目的探究TiN/BN与AlN/BN两类纳米混合添加剂在油润滑中的摩擦学性能,分析纳米润滑油润滑机理。方法以油酸作为分散剂,提高纳米添加剂在基础油中的分散性能,利用MRS-10A型四球摩擦磨损实验机对不同混合比例、不同添加浓度的TiN/BN与AlN/BN纳米润滑油进行摩擦学性能测试,使用扫描电镜观察磨斑表面形貌,用EDS和XPS检测磨斑表面元素种类及相应化合价态。结果经油酸分散的混合纳米粒子的质量比为1︰1时,纳米润滑油表现出最好的抗磨减摩性能。其中TiN/BN纳米混合添加剂的质量分数为0.6%时,磨斑直径和摩擦系数较基础油分别降低34.97%和16.75%,最大无卡咬负荷提高65.96%;AlN/BN纳米混合添加剂的质量分数为0.2%时,磨斑直径和摩擦系数较基础油分别降低24.49%和11.76%,最大无卡咬负荷提高38.30%。磨斑表面磨痕沟槽深度、宽度减小,表面粗糙度明显降低。结论分散在油液中的AlN、BN、TiN纳米粒子进入摩擦副间发挥承载支撑作用,将滑动摩擦变为滑动-滚动混合摩擦,降低摩擦磨损。进入摩擦副间的AlN纳米粒子由于高表面能特性,沉淀吸附于摩擦表面凹坑处,修复磨损表面,TiN、BN纳米粒子与摩擦表面发生化学反应,生成由Fe-O、Ti-O、BOx及TiNxOy等物质所构成的自修复膜,表现出较好的抗磨减摩及自修复性能。
The work aims to study the tribological properties of TiN/BN and AlN/BN nano-additives in oil lubrication and analyze the lubrication mechanism of nano-lubricating oil. Oleic acid was used as dispersant to improve the dispersibility of nano-additives in base oil, and the tribological properties of TiN/BN and AlN/BN nano-lubricants with different mixing ratios and concentrations were tested by MRS-10 A four-ball friction and wear tester. SEM was used to observe the surface morphology of wear scar, and EDS and XPS were used to detect the types of elements on the surface of wear scar and corresponding valence states. When the mass ratio of nano-particles dispersed by oleic acid was 1︰1, the nano-lubricating oil showed the best anti-wear and anti-friction performance. With the application of 0.6 wt% TiN/BN mixed additives, the wear scar diameter and friction coefficient were reduced by 34.97% and 16.75%, respectively and the maximum non-sticking bite load was increased by 65.96%. While the wear scar diameter and friction coefficient were reduced by 24.49% and 11.76% and the maximum non-sticking bite load was increased by 38.30%, with the application of 0.2 wt% AlN/BN composite additives. The depth and width of the grooves and the surface roughness were reduced with the application of nano composite additives. AlN, BN and TiN nanoparticles dispersed in oil play the role of bearing support between friction pairs, changing sliding friction into sliding-rolling mixed friction and reducing friction and wear. AlN nanoparticles entering the friction pairs are deposited and adsorbed in the pits of the friction surface to repair the worn surface due to its high surface energy characteristics. TiN and BN nanoparticles react with the friction surface to form a lubricating self-repairing film composed of Fe-O, Ti-O, BOx and TiNxOy, which shows great anti-wear, anti-friction and self-repairing properties.
作者
孟凡善
李征
程焯
王文健
刘启跃
MENG Fan-shan;LI Zheng;CHENG Zhuo;WANG Wen-jian;LIU Qi-yue(Advanced Drive Energy Saving Technology Engineering Research Center under the Ministry of Education,Chengdu 610031,China;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Department of Mechanical and Electrical Engineering,Qingdao University of Technology(Linyi),Linyi 273400,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2019年第11期259-265,282,共8页
Surface Technology
基金
国家重点研发计划政府间国际科技创新合作重点专项(2018YFE0109400)
青岛理工大学(临沂)自然科学基金项目(2017ZR006)~~
