Influence of currents on tribological behavior of diamond-like carbon films
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Influence of currents on tribological behavior of diamond‑like carbon films Yan Wang1,2 · Minglan Zhang1 · Yunfeng Wang2 · Guangan Zhang1 · Zhibin Lu1 Received: 14 November 2019 / Accepted: 18 February 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The diamond-like carbon (DLC) film is vastly applied for low-friction protective films at contact sliding surfaces. This work reported the characteristics and tribological properties of DLC, Cu-doped DLC (Cu-DLC) film and Ti-doped DLC (Ti-DLC) film formed by unbalanced magnetron sputtering system and analyzed the frictional tests and the morphology of wear scars. The current intensity at the sliding interface was set to a constant value in the whole current circuit for exploring the influence of current, including 0 A, 0.5 A, 1 A, 1.5 A and 2 A. The results showed the friction coefficient of DLC film decreased from 0.12 to 0.06–0.08 and then increases rapidly to 0.26 when the current increased to 2 A. The change in trend of friction coefficient of Cu-DLC film with the increase in current was the same with the DLC film. The minimum value was 0.12 at 1 A current. In the case of Ti-DLC film, when the current intensity enhanced from 0 to 2 A, the friction coefficient monotonically increased from 0.06 to 0.29. Furthermore, the wear rate of the films under higher current was larger than the wear rate of the films under lower current. This is due to the fact that frictional heat and Joule heat are generated at a relatively large current to make the surface of the film more susceptible to wear. The wear rate of Ti-DLC film is relatively larger as the arc ablation is the main wear mechanism of Ti-DLC film compared with pure DLC film and Cu-DLC film. Keywords Diamond-like carbon · Currents · Friction and wear · Arc erosion
1 Introduction The tribological problem of sliding electrical contact elements has attracted wide attention in recent years [1–3]. It mainly refers to a device which can transfer current or signal transmission at various contact interfaces by sliding two conductors in a complex power system of electricity, such as collector shoe [3], the system of electrified railway [4], Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-3416-9) contains supplementary material, which is available to authorized users. * Yunfeng Wang [email protected] * Guangan Zhang [email protected] 1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, People’s Republic of China
2
conductive brush [5] and pantograph strip [6]. The essence of sliding electrical contact is the tribological properties of contact materials in circuits under different currents. The service life of electricity transmission system is mainly affected by the friction and wear properties of the electrical contact materials. Therefore
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