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Failure mechanisms of lubricating film on M50-Ag composites

Hongru Ma (Department of Mechanical Engineering, Anyang Institute of Technology, Anyang, China)
Xiaobin Deng (School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)
Xiaoliang Shi (School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)
Guanchen Lu (School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)
Hongyan Zhou (School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)
Yuan Chen (School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)
Zhenyu Yang (School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 8 October 2019

Issue publication date: 6 April 2020

75

Abstract

Purpose

This paper aims to explore the damage mechanism of a lubricating film on the worn surface of solid self-lubricating composites under different loads.

Design/methodology/approach

By comparing the actual stress with the strength, it is possible to determine the approximate wear state of the lubricating film. To prove the validity of the mathematical model that can predict the initiation of micro cracks or even the failure of the lubricating film, M50-5 Wt.% Ag self-lubricating composites (MA) was prepared. Tribological tests of the composites against Si3N4 ceramic balls were conducted at room temperature from 2 to 8 N. The electron probe microanalysis images of the lubricating film verify the wear state of the lubricating film.

Findings

The study found that the back edge of the contact area is the most vulnerable to destruction. The tensile stress and the equivalent shear stress have a positive correlation with load and friction coefficient. When the load is 4 N, an intact lubricating film covers the worn surface because the tensile stress and the equivalent shear stress are below the tensile strength and the shear strength, respectively; under other working conditions, the lubricating film is destroyed.

Originality/value

This paper has certain theoretical guidance for the study of tribological properties of solid self-lubricating composites. Moreover, this mathematical model is appropriate to be applied for the other composites.

Keywords

Acknowledgements

This work was supported by the Project for Science and Technology Plan of Henan Province (No.192102210054, No.192102210010) and the Fundamental Research Funds for Central Universities (2017-IVA-117). The authors also wish to thank the Material Research and Test Center of WUT and M.J. Yang, X.L. Nie, S.L. Zhao, Y.M. Li and W.T. Zhu for their assistance with EPMA and FESEM.

Citation

Ma, H., Deng, X., Shi, X., Lu, G., Zhou, H., Chen, Y. and Yang, Z. (2020), "Failure mechanisms of lubricating film on M50-Ag composites", Industrial Lubrication and Tribology, Vol. 72 No. 3, pp. 389-395. https://doi.org/10.1108/ILT-04-2019-0158

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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