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Research Article | Open Access

Conductive and tribological properties of TiN-Ag composite coatings under grease lubrication

Feihu LIN, Yanqiu XIA( ), Xin FENG
School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
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Abstract

TiN-Ag composite coatings were prepared by pulsed bias arc ion plating. X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS) were applied to analyze the compositions of the coatings. Tribological properties of the coatings were studied using an MFT-R4000 ball-on-disk friction tester in the presence of lubricating greases containing multilayer graphene. Scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used to analyze the worn surface compositions of the lubricating films. The results show that with the decrease in Ag in the film, hardness increased but electrical conductivity decreased. The coating with 10 at% Ag content shows the best friction-reducing and anti-wear properties, which can be attributed to the moderate content of Ag embedded in the TiN crystal gap that enhanced the grain bonding force to improve the anti-wear and self-lubricating ability. Graphene can be adsorbed on the coating as a solid lubricant.

Keywords

silvertribologycontact resistancelubricating grease

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Friction
Volume 9 Issue 4,
August 2021
Pages 774-788
DOI: 10.1007/s40544-020-0373-4

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Cite this article:
LIN F, XIA Y, FENG X. Conductive and tribological properties of TiN-Ag composite coatings under grease lubrication. Friction, 2021, 9(4): 774-788. https://doi.org/10.1007/s40544-020-0373-4

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Received: 26 September 2019
Revised: 15 November 2019
Accepted: 16 February 2020
Published: 28 August 2020
© The author(s) 2020

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