Clarification of the Effect of Surface Energy on Tribological Behavior of Two-Phase Lubricant Using Reflectance Spectroscopy and Hydrodynamic Analysis

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-02-13 DOI:10.1007/s11249-023-01827-z

Kodai Hirata, Motoyuki Murashima, Noritsugu Umehara, Takayuki Tokoroyama, Woo-Young Lee, Naoya Hashizume, Taku Sato, Ryoko Nagata, Kiyoshi Hanyuda, Ayano Otsuka, Mao Ueda

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Abstract

Recently, a new type of lubricant called two-phase lubricants has been developed to realize a high viscosity index. Two-phase lubricants are mixtures of two different lubricants, realizing low viscosity even at low temperatures due to the temperature dependence of the solubility of the lubricant molecules. In the present paper, the effect of surface energy on the tribological behavior of the two-phase lubricant is clarified using in situ observation with reflection spectroscopy. Sliding surfaces with high hydrogen-bonding terms in the surface energy components attracted high-polar lubricants, resulting in reduced friction. Analysis of the theoretical friction coefficient using Couette flow assumption revealed an important design concept of two-phase lubricants: the concentration of high viscosity lubricants on solid surfaces develops a viscosity distribution in the oil film, resulting in reduced friction.

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利用反射光谱和流体力学分析澄清表面能对两相润滑油摩擦学行为的影响

最近，一种被称为两相润滑剂的新型润滑剂被开发出来，以实现高粘度指数。两相润滑剂是两种不同润滑剂的混合物，由于润滑剂分子的溶解度与温度有关，因此即使在低温下也能实现低粘度。本文利用反射光谱仪进行现场观察，阐明了表面能对两相润滑剂摩擦学行为的影响。表面能成分中氢键项较高的滑动表面吸引了高极性润滑剂，从而降低了摩擦力。利用库瓦特流假设对理论摩擦系数进行的分析揭示了两相润滑剂的一个重要设计理念：固体表面上高粘度润滑剂的浓度会在油膜中形成粘度分布，从而降低摩擦力。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.