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The analysis of the self-lubricating behavior and local failure mechanism of silver-rich solid film

Xiaoxue Li (School of Mechanical and Traffic Engineering, Ordos Institute of Technology, Ordos, China and School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)
Kang Yang (Department of Mechanical Engineering, Anyang Institute of Technology, Anyang, China and School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China)
Hongru Ma (Department of Mechanical Engineering, Anyang Institute of Technology, Anyang, China)
Haibo Lin (School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong, China)
Yukun Han (Department of Mechanical Engineering, Anyang Institute of Technology, Anyang, China)
Qiang He (Department of Mechanical Engineering, Anyang Institute of Technology, Anyang, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 8 October 2018

Issue publication date: 13 November 2018

60

Abstract

Purpose

The main aim of this paper was to study the self-lubricating behavior and failure mechanism of silver-rich solid film for in-depth analyzing of the friction and wear property of TiAl-10 wt. per cent Ag self-lubricating composite.

Design/methodology/approach

The friction and wear property of TiAl-10 wt. per cent Ag self-lubricating composite sliding against Si3N4 ball was tested under the testing conditions of ball-on-disk wear system. Field emission scanning electron microscopy and electron probe microanalyzer were used to analyze the surface morphology of silver-rich solid film. The main element contents were tested by energy dispersive spectroscopy. Silver phase on wear scar could be well identified using X-ray photo-electron spectroscopy. The theory calculation of shearing stress on wear scar was executed to discuss the local failure mechanism of silver-rich solid film. The lubricating role of silver was also discussed to analyze the anti-friction and anti-wear behavior of silver-rich solid film.

Findings

The friction coefficients and wear rates of TASC gradually reduced at 0-65 min, and approached to small values (0.31 in friction coefficient and 3.10×104 mm3N-1m-1 in wear rate) at 65-75 min. The excellent friction and wear behavior of TASC was mainly attributed to the lubricating property of silver-rich film at 65-75 min. At 12→20 N, surface shearing stress increased up to 146.31 MPa, and exceeded more than the shearing strength (125 MPa) of silver-rich film, which caused the propagating of fatigue crack and the destroying of silver-rich film, leading to high friction and severe wear.

Originality/value

It is important that the self-lubricating behavior and local failure of solid film is explored for further understanding the friction and wear property of TiAl alloys.

Keywords

Acknowledgements

This paper forms part of a special section “Advances in Engineering Tribology Technology (ICEATAT2016)”, guest edited by Jeng-Haur Horng.

This study is supported by the Foundation of Henan Educational Committee (16A460001), Science research project in Inner Mongolia Autonomous Region for the institution of higher learning (NJZZ16369) and talent introduction project of Sichuan University of Science & Engineering (2016RCL04). The authors are also appreciative of Nanjing XFNANO Materials Tech Co., Ltd for their kind help with the powders.

Citation

Li, X., Yang, K., Ma, H., Lin, H., Han, Y. and He, Q. (2018), "The analysis of the self-lubricating behavior and local failure mechanism of silver-rich solid film", Industrial Lubrication and Tribology, Vol. 70 No. 8, pp. 1560-1568. https://doi.org/10.1108/ILT-12-2017-0381

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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