李重阳,王高琦,韩庆国,冯国玉,王立虎,王守仁.纳米Fe3O4颗粒对离子液体润滑减摩及电控增摩性能的影响[J].表面技术,2023,52(2):233-244, 281.
LI Chong-yang,WANG Gao-qi,HAN Qing-guo,FENG Guo-yu,WANG Li-hu,WANG Shou-ren.Effect of Nano-Fe3O4 Particles on Lubrication and Friction-reducing as Well as Electronically Controlled Friction-increasing Properties of Ionic Liquid[J].Surface Technology,2023,52(2):233-244, 281 |
| 纳米Fe3O4颗粒对离子液体润滑减摩及电控增摩性能的影响 |
| Effect of Nano-Fe3O4 Particles on Lubrication and Friction-reducing as Well as Electronically Controlled Friction-increasing Properties of Ionic Liquid |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.02.021 |
| 中文关键词: 纳米Fe3O4 离子液体 铁磁流体 润滑 载流 电控增摩 |
| 英文关键词:nano-Fe3O4 ionic liquid ferromagnetic fluid lubrication current-carrying electronically controlled friction-increasing |
| 基金项目:山东省自然科学基金重大基础研究项目(ZR2020ZD06);山东省自然科学基金重点项目(ZR2020KE062) |
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| Author | Institution |
| LI Chong-yang | School of Mechanical Engineering, University of Jinan, Jinan 250022, China |
| WANG Gao-qi | School of Mechanical Engineering, University of Jinan, Jinan 250022, China |
| HAN Qing-guo | Shandong Longxiang New Material Technology Co., Ltd., Shandong Dezhou 253300, China |
| FENG Guo-yu | Shandong Longxiang New Material Technology Co., Ltd., Shandong Dezhou 253300, China |
| WANG Li-hu | School of Construction Machinery, ShandDong JiaoTong University, Jinan 250357, China |
| WANG Shou-ren | School of Mechanical Engineering, University of Jinan, Jinan 250022, China |
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| 中文摘要: |
| 目的 提高离子液体在常态环境下的润滑减摩能力及电场条件下的电控增摩响应特性。方法 将合成油酸改性后的Fe3O4纳米颗粒分散添加到离子液体中，制备了不同浓度的离子液体基铁磁流体，通过利用自制载流摩擦磨损试验机，分别模拟测试了常态环境与电场环境下纯离子液体与离子液体基铁磁流体摩擦因数的变化，同时利用白光干涉仪、扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)对比分析了磨损形貌。结果 在常态环境下，Fe3O4纳米颗粒的“滚珠减摩效应”显著提高了离子液体在常态环境中的润滑效果。随着纳米Fe3O4颗粒质量分数的增加，磨痕逐渐变得光滑平整，剥落和磨粒聚集现象也逐渐消失，尤其是当质量分数为30%时，试样磨痕内部仅有较浅的犁沟和轻微的划痕，此时的摩擦因数也展现出了极低的水平，约为0.04，远低于纯离子液体润滑时的0.085。同时纳米颗粒的“电致沉积效应”增强了离子液体在电场环境中的电控增摩响应能力，当电流强度达到20 A时，对于质量分数为30%的离子液体基铁磁流体，摩擦因数瞬时提高了近1倍，增幅达到了0.039，是相同条件下纯离子液体摩擦因数增长幅度的4倍。结论 将合成改性后的Fe3O4纳米颗粒分散添加到离子液体中，成功制备了离子液体基铁磁流体，并且通过调控纳米颗粒含量，显著提高了离子液体的润滑性能和电控增摩响应能力。 |
| 英文摘要: |
| In order to improve the lubrication and wear reduction ability and electronically controlled friction increasing response characteristics of ionic liquid (IL), Fe3O4 nanoparticles were synthesized by chemical coprecipitation and modified by oleic acid, and dispersed into ionic liquid. On the premise of not exceeding the maximum dissolution limit of ionic liquid, Fe3O4 nanoparticles with mass fractions of 5%, 15% and 30% ionic liquid-based ferromagnetic fluid, and then the friction coefficient changes of pure ionic liquid and ionic liquid based ferromagnetic fluid under normal environment and electric field environment were simulated and tested by using a self-made current carrying friction and wear tester. At the same time, the wear morphology was compared and analyzed by white light interferometer and scanning electron microscope (SEM), The element content and phase composition of the wear area were further analyzed by energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results showed that the "ball antifriction effect" of Fe3O4 nanoparticles significantly improved the lubrication effect of ionic liquid in normal environment. With the increase of the mass fraction of Fe3O4 nanoparticles, the wear surface gradually became smooth and flat, and the phenomena of peeling and abrasive particle aggregation gradually disappeared, especially when the mass fraction was 30%. There were only shallow furrows and slight scratches in the wear marks of the sample. At this time, the friction coefficient also showed a very low level, about 0.04, which was much lower than 0.085 under pure ionic liquid lubrication, and the wear volume was only 2.12×10‒3 mm3 was much lower than 5.41×10‒3 mm3 in pure ionic liquid lubrication; At the same time, the "electrodeposition effect" of nanoparticles enhanced the electronically controlled friction increasing response ability of ionic liquid in electric field environment. When the current intensity reached 20 A, the friction coefficient of ionic liquid-based ferromagnetic fluids with mass fraction of 30% was instantaneously increased by nearly one time, and the increase of friction coefficient reached 0.039, which was four times that of pure ionic liquid under the same conditions. Therefore, it could be concluded that the ionic liquid-based ferromagnetic fluid was successfully prepared by dispersing the synthesized and modified Fe3O4 nanoparticles into the ionic liquid, and the lubrication performance and electronically controlled friction increasing response of the ionic liquid were significantly improved by adjusting the content of nanoparticles, In terms of lubrication performance:the spherical Fe3O4 nanoparticles changed the motion mode between friction pairs from relative sliding to relative rolling friction, reduced the severity of friction and improved the lubrication effect. In terms of electronically controlled friction enhancement:due to the electrodeposition effect, the directional movement of nano Fe3O4 particles under the action of electric field made nano Fe3O4 particles easy to deposit and aggregate on the surface of the lower sample, which affected the integrity and fluidity of the lubricating oil film, making the adsorbed oil film of ionic liquid-based ferromagnetic fluid easier to be broken down by current than that of pure ionic liquid, The lack of lubricating adsorption oil film worsened the lubrication conditions, and the micro protrusions between the upper and lower sample surfaces were more likely to make direct contact with each other. At the same time, under the action of current, melting and spot welding were also easy to occur between the friction pair materials. At this time, the friction state was more like severe "dry friction", resulting in a significant increase in the friction coefficient, which was manifested as the phenomenon of electronically controlled friction increase. |
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