不同基底石墨烯涂层的层间滑移减磨性能研究
Study on the effects of different substrates and interlayer slip of graphene coatings on their friction reduction performances
周家源 1卢艳2
作者信息
- 1. 武汉科技大学 冶金装备及其控制教育部重点实验室,武汉 430081;武汉科技大学机械传动与制造工程湖北省重点实验室,武汉 430081
- 2. 武汉科技大学机械传动与制造工程湖北省重点实验室,武汉 430081;武汉科技大学 精密制造研究院,武汉 430081
- 折叠
摘要
石墨烯薄膜作为一种二维材料,是提高微/纳机电系统(MEMS/NEMS)摩擦力学性能的优异润滑剂.为了探究基底材料和石墨烯层数对其减磨性能的影响,本文通过在不同基底制备了不同层数的石墨烯涂层,利用原子力显微镜(AFM)实验和分子动力学(MD)仿真结合的方法,研究了石墨烯层数对减磨效应的影响.并且通过建立不同层数石墨烯涂层的摩擦性能分析模型,探究出石墨烯层间滑移是产生减磨的主要因素.结果表明:在不同载荷下,石墨烯涂层对硅基底和铜基底均有优异的减磨效果,摩擦力随着石墨烯层数的增加逐渐降低,当石墨烯层数大于10层时,达到最优99.3％的减磨效果.通过仿真分析发现,随着层数增加,石墨烯与基底的干摩擦转变为石墨烯的层间摩擦,并产生层间剪切滑移,石墨烯层间滑移是导致多层石墨烯优异减磨性能的主要因素.
Abstract
Graphene films,as a two-dimensional material,are excellent lubricants for improving the tribome-chanical properties of micro/nano electro-mechanical systems(MEMS/NEMS).In order to investigate the in-fluence of substrate material and graphene layer number on its friction reduction performance,this paper investi-gates the influence of graphene layer number on the friction reduction effect by preparing graphene coatings with different layer numbers on different substrates and using a combination of atomic force microscopy(AFM)exper-iments and molecular dynamics(MD)simulations.And by establishing the analytical model of the friction per-formance of graphene coatings with different layer numbers,it was investigated that the interlayer slip of graphene is the main factor to produce the wear reduction.The results show that the graphene coating has excellent wear reduction effect on both silicon substrate and copper substrate under different loads,and the friction decreases gradually with the increase of the number of graphene layers,and reaches the optimal 99.3％wear reduction effect when the number of graphene layers is more than 10.The simulation analysis reveals that as the number of layers increases,the dry friction between graphene and substrate transforms into interlayer friction of graphene and generates interlayer shear slip,and the interlayer slip of graphene is the main factor leading to the excellent wear reduction performance of multilayer graphene.
关键词
石墨烯涂层/原子力显微镜/分子动力学仿真/剪切滑移Key words
Graphene coatings/AFM/MD simulation/Shear slip引用本文复制引用
基金项目
国家自然科学基金(51875417)
国家自然科学基金(51975425)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据