The effect of electrical current on lubricant film thickness in boundary and mixed lubrication contacts measured with ultrasound

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Friction Pub Date : 2024-05-23 DOI:10.1007/s40544-024-0890-7
Julio A. Cao-Romero-Gallegos, Saeid Taghizadeh, Oscar A. Aguilar-Rosas, R. S. Dwyer-Joyce, Leonardo I. Farfan-Cabrera
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Abstract

This work explores experimentally the effects of DC electrical currents on lubricant film thickness alteration in lubricated sliding steel contacts in the boundary and mixed regime as measured by ultrasound. The experiments were performed in a two-electrode cell-based pin-on-disk tester instrumented with ultrasonic transducers. Unelectrified and electrified tribological tests were conducted on steel flat-on-flat contacts under various speeds and loads using both a mineral base oil and a gear oil. Film thickness, coefficient of friction (CoF), and electrical contact resistance (ECR) were measured during short experiments (30 s) in unelectrified and electrified (1.5 and 3 A) conditions. The results suggest that film thickness, CoF, and all ECR are altered by passing DC currents through the contact. In particular, film thickness increased and decreased, respectively, by applying electricity at the different speeds and loads tested. These alterations were majorly ascribed to oil viscosity decrease by local heat and surface oxidation caused by electrical discharge and break down at the interface.

Abstract Image

用超声波测量电流对边界和混合润滑接触中润滑油膜厚度的影响
这项研究通过实验探索了直流电流在边界和混合状态下对润滑滑动钢触点中润滑油膜厚度变化的影响,并通过超声波进行了测量。实验在配备超声波传感器的双电极针盘测试仪中进行。使用矿物基础油和齿轮油,在不同速度和载荷下对钢制平对平触头进行了无电和有电摩擦学测试。在无电和有电(1.5 A 和 3 A)条件下的短时间实验(30 秒)中,测量了油膜厚度、摩擦系数(CoF)和电接触电阻(ECR)。结果表明,薄膜厚度、CoF 和所有 ECR 都会因通过接触的直流电流而改变。特别是,在测试的不同速度和负载下通电,薄膜厚度分别增加和减少。这些变化主要归因于局部热量和表面氧化引起的油粘度降低,以及界面上的放电和分解。
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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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