A synergetic strategy based on laser surface texturing and lubricating grease for improving the tribological and electri
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
A synergetic strategy based on laser surface texturing and lubricating grease for improving the tribological and electrical properties of Ag coating under current-carrying friction Zhengfeng CAO1,*, Yanqiu XIA2,*, Chuan CHEN2,3, Kai ZHENG1, Yi ZHANG1 1
School of Advanced Manufacturing Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2
School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
3
Global Energy Interconnection Research Institute Co., Ltd., Beijing 102211, China
Received: 19 September 2019 / Revised: 17 February 2020 / Accepted: 15 March 2020
© The author(s) 2020. Abstract: Herein, a series of Ag coatings with different micro-dimples were fabricated on copper surfaces by laser surface texturing (LST) and magnetron sputtering. Multilayer graphene lubricating grease (MGLG) was prepared using multilayer graphene as an additive. The textured Ag coatings and MGLG were characterized. Moreover, the tribological and electrical performances of the textured Ag coatings under MGLG lubrication were investigated in detail. Results demonstrated that the textured Ag coating with an appropriate dimple diameter could exhibit improved tribological and electrical properties when compared to the non-textured Ag coating under MGLG lubrication. The characterization and analysis of the worn surfaces suggest that the synergetic effect of LST and MGLG contributes to these excellent tribological and electrical properties. Keywords: laser surface texturing; tribology; contact resistance; lubricating grease
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Introduction
Sliding electrical connectors have attracted considerable attention in academic and industrial fields due to their involvement in extremely complex phenomena including mechanical, electrical, thermal, and material aspects [1–4]. To achieve a high level of reliability and service life, sliding electrical materials should possess a combination of characteristics, which include superior friction reduction, anti-wear abilities, low electrical contact resistance (ECR), and preferable corrosion resistance. At present, sliding electrical contacts are usually coated with soft noble metals such as Ag and Au, which can provide a relatively large real contact area, an excellent conductivity, and preferential corrosion and oxidation resistances [4–6]. However, the tribological performance, which greatly impacts the reliability and service life of sliding electrical connectors,
is currently unsatisfactory [4, 5]. Wear is one of the major factors leading to the deterioration and failure of sliding electrical connectors and the wear mechanisms are mainly attributed to abrasive and adhesive wear [7, 8]. The operating temperature of sliding electrical connectors usually fluctuates over a wide range due to friction, wear, electrical current, and arc erosions [9]. Trinh et al. reported that the maximum temperature may achieve ~150 °C [8]. At high temperatures, the soft noble coat
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