中国机械工程2024，Vol.35Issue(3)：445-456,12.DOI:10.3969/j.issn.1004-132X.2024.03.007
球形纳米颗粒在镍基合金纳米流体微量润滑磨削界面摩擦学机制的分子动力学研究
Molecular Dynamics Study on Tribological Mechanism of Spherical Nanoparticles on Nickel-based Alloy Grinding Interfaces under Nanofluid MQL
摘要
Abstract
This paper aimed to study the anti-friction and anti-wear mechanism and to further re-veal the formation mechanism of lubrication film generated by nanofluid on the grinding interfaces through molecular dynamics simulations.1-butyl-3-methylimidazolium tetrafluoroborate([BMIM]BF4 ionic liquid)was used as the base fluid of nanofluid.And spherical nanoparticles made of alumina and copper were taken as representatives of high-and low-hardness nanoparticles respectively.The re-sults show that boundary lubrication layer is formed on the grinding interfaces in NMQL grinding of nickel-based alloy.Copper nanoparticle occurs a series of tribological behaviors on the grinding inter-faces,such as compression,shear,spread and separation,because of the far lower hardness than that of abrasive grains and nickel-based alloy workpiece.A layer of solid lubricating film was finally formed by copper nanoparticle,which may reduce the contact areas between abrasive grain and workpiece,re-sulting in lowered tangential grinding force by 4.6 percent compared with MQL grinding.Alumina nanoparticle maintains the initial spherical nanostructure during grinding due to their higher hardness than that of nickel-based alloy workpiece.Three tribological behaviors,i.e.sliding,rolling and polis-hing,occur on the grinding interfaces.The polishing scratches may enlarge the wet areas of ionic liq-uid,and hence may reduce the contact areas between abrasive grain and workpiece.The rolling behav-ior of alumina nanoparticle that moves like rolling balls may transform the sliding friction between ab-rasive grain and workpiece into rolling friction.Tangential grinding force is therefore reduced by 6.6 percent compared with MQL grinding.关键词
磨削/微量润滑/纳米流体/球形纳米颗粒/摩擦学机制Key words
grinding/minimum quantity lubrication(MQL)/nanofluid/spherical nanoparticle/tribological mechanism分类
信息技术与安全科学引用本文复制引用
张宇,王德祥,郭峰,栗心明..球形纳米颗粒在镍基合金纳米流体微量润滑磨削界面摩擦学机制的分子动力学研究[J].中国机械工程,2024,35(3):445-456,12.基金项目
山东省自然科学基金(ZR2022ME208) （ZR2022ME208）
