含水量对乙二醇溶液超润滑性的影响

IF 3.1 3区 工程技术 Q2 ENGINEERING, MECHANICAL Lubricants Pub Date : 2023-10-31 DOI:10.3390/lubricants11110466
Lvzhou Li, Peng Gong, Pengpeng Bai, Xiangli Wen, Yonggang Meng, Jianning Ding, Yu Tian
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引用次数: 0

摘要

水和乙二醇(EG)的水溶液普遍用于制动,传热和润滑系统。然而,通过水含量影响EG溶液的润滑属性的确切机制仍然难以捉摸。本研究系统地考察了不同浓度的EG溶液使用陶瓷- tialn摩擦副系统的摩擦学特性。随着EG浓度的增加,润滑油介质中相关分子络合物结构的顺序转变为:[H2O]m·EG→[H2O]m·[EG]n→H2O·[EG]n。其中,化学计量系数“m”和“n”分别是分子复合体结构中H2O和EG最简单的摩尔比。最佳EG浓度为50% wt.%。在此浓度下,摩擦副表面形成具有显著承载能力(由于氢键强烈)的柔性分子络合物([H2O]m·[EG]n),缩短了磨合时间,有利于实现超润滑,摩擦系数(COF)约为0.0047。含有50 wt.% EG的溶液提高了润滑介质的承载能力和亲水性。此外,它们最大限度地减少了磨损区域的粗糙度,减少了摩擦界面的粘附力和剪切应力,从而实现了超润滑。因此,该研究为最佳水与eg比提供了有价值的见解,揭示了具有特殊摩擦学属性的超润滑系统的机制,并具有实际应用的巨大潜力。
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Impact of Water Content on the Superlubricity of Ethylene Glycol Solutions
Aqueous solutions of water and ethylene glycol (EG) are prevalently employed in braking, heat transfer, and lubrication systems. However, the precise mechanism through which water content affects the lubricative attributes of EG solutions remains elusive. This research systematically examines the tribological characteristics of EG solutions at varying concentrations using a ceramic–TiAlN friction-pair system. As the concentration of EG increases, the sequential transformation of the associated molecular complex structure in the lubricating medium can be described as follows: [H2O]m·EG → [H2O]m·[EG]n → H2O·[EG]n. Among them, the stoichiometric coefficients “m” and “n” are the simplest mole ratio of H2O and EG in the molecular complex structure, respectively. The most favorable EG concentration was determined to be 50 wt.%. At this concentration, a flexible molecular complex adsorption structure ([H2O]m·[EG]n) with a significant bearing capacity (due to intense hydrogen bonding) forms on the surface of the friction pair, which results in a reduction in the running-in duration and facilitates the achievement of superlubricity, and the coefficient of friction (COF) is about 0.0047. Solutions containing 50 wt.% EG enhance the load-bearing ability and hydrophilicity of the lubricating medium. Moreover, they minimize the roughness of the worn region and curtail the adhesive forces and shear stress at the frictional interface, enabling the realization of superlubricity. Consequently, this research offers valuable insights into the optimal water-to-EG ratio, revealing the mechanism of a superlubricity system that possesses exceptional tribological attributes and holds significant potential for practical applications.
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来源期刊
Lubricants
Lubricants Engineering-Mechanical Engineering
CiteScore
3.60
自引率
25.70%
发文量
293
审稿时长
11 weeks
期刊介绍: This journal is dedicated to the field of Tribology and closely related disciplines. This includes the fundamentals of the following topics: -Lubrication, comprising hydrostatics, hydrodynamics, elastohydrodynamics, mixed and boundary regimes of lubrication -Friction, comprising viscous shear, Newtonian and non-Newtonian traction, boundary friction -Wear, including adhesion, abrasion, tribo-corrosion, scuffing and scoring -Cavitation and erosion -Sub-surface stressing, fatigue spalling, pitting, micro-pitting -Contact Mechanics: elasticity, elasto-plasticity, adhesion, viscoelasticity, poroelasticity, coatings and solid lubricants, layered bonded and unbonded solids -Surface Science: topography, tribo-film formation, lubricant–surface combination, surface texturing, micro-hydrodynamics, micro-elastohydrodynamics -Rheology: Newtonian, non-Newtonian fluids, dilatants, pseudo-plastics, thixotropy, shear thinning -Physical chemistry of lubricants, boundary active species, adsorption, bonding
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