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Research Article | Open Access

Friction of metal-matrix self-lubricating composites: Relationships among lubricant content, lubricating film coverage, and friction coefficient

Jinkun XIAO1,2( ), Yuqing WU1, Wei ZHANG1, Juan CHEN3, Chao ZHANG1
College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China
College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
Testing Center, Yangzhou University, Yangzhou 225009, China
Show Author Information

Abstract

Metal-matrix self-lubricating composites can exhibit excellent tribological properties owing to the release of solid lubricant from the matrix and the formation of a lubricating film on the tribosurface. The coverage of the lubricating film on a worn surface significantly influences the sliding process. However, it is difficult to quantify the film coverage owing to the thin and discontinuous character of the lubricating film and the high roughness of the worn surface. A quantitative characterization of the lubricating film coverage based on X-ray photoelectron spectroscopy (XPS) analysis was developed in this study. The friction tests of Cu-MoS2 composites with a MoS2 content of 0-40 vol% were conducted, and the worn surfaces of the composites were observed and analyzed. Further, the influence of the MoS2 volume content on the coverage of the lubricating film on the worn surface was investigated. The relationships among the volume fraction of the lubricant, coverage of the lubricating film, and the friction coefficient were established. The friction model for the metal matrix self-lubricating composites was developed and verified to facilitate the composition design and friction coefficient prediction of self-lubricating composites.

Keywords

self-lubricating compositesfriction coefficientlubricating filmXPS

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Friction
Volume 8 Issue 3,
June 2020
Pages 517-530
DOI: 10.1007/s40544-019-0270-x
Cite this article:
XIAO J, WU Y, ZHANG W, et al. Friction of metal-matrix self-lubricating composites: Relationships among lubricant content, lubricating film coverage, and friction coefficient. Friction, 2020, 8(3): 517-530. https://doi.org/10.1007/s40544-019-0270-x

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Received: 06 May 2018
Revised: 30 July 2018
Accepted: 29 December 2018
Published: 27 March 2019
© The author(s) 2019

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