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Preparation and tribological properties of MoS2/graphite composite coatings modified by La2O3

Ming Qiu (School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, China and Collaborative Innovation Center of Machinery Equipment Advanced Manufacturing of Henan Province, Luoyang, China)
Rui Zhang (School of Mechatronics Engineering, Henan University of Science and Technology, School of Mechatronics Engineering, Luoyang, China)
Yingchun Li (School of Mechanical Engineering, Henan University of Science and Technology, Luoyang, China)
Hui Du (School of Mechatronics Engineering, Henan University of Science and Technology, School of Mechatronics Engineering, Luoyang, China)
Xiao Xu Pang (School of Mechatronics Engineering, Henan University of Science and Technology, School of Mechatronics Engineering, Luoyang, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 10 August 2018

Issue publication date: 13 November 2018

142

Abstract

Purpose

The MoS2/graphite composite coatings modified by La2O3 through spraying technique were successfully prepared on the inner rings of spherical plain bearings. As a comparison, unmodified coatings were also prepared. This paper aims to study the La-modified MoS2/graphite composite coating experimentally and improve the tribological performance of self-lubricating spherical plain bearings.

Design/methodology/approach

The performance of La2O3 toward the friction coefficient, temperature rise and wear rate of the coatings was studied by a self-made tribo-tester under different swing cycles. And the texture, surface morphology and element composition of the coatings were characterized by scanning electron microscope, energy dispersive spectroscopy and X-ray diffractometry.

Findings

The additives La2O3 refined the coatings’ microstructure and improved the tribological properties of the coatings. The oxidation of Mo + 4 to Mo + 6 was effectively inhibited. And the amount of abrasive grains, peeling pits and local cracks on the coatings surface decreased and homogeneous lubricating films formed, which were attributed to the existence of La2O3. The wear mechanisms of unmodified coatings were severe abrasive wear, adhesive wear and delamination wear. However, it exhibited superior wear resistance of the La-modified coatings to unmodified coatings, presenting slight abrasive wear and adhesive wear. The service life of bearings was prolonged under the protection of the modified coatings.

Originality/value

The paper proposed a new modified MoS2/Graphite composite coating for the self-lubricating spherical plain bearings. The investigation on the friction, wear and temperature increase behaviors and the wear mechanisms of the coatings are beneficial to prolonging the service life of the self-lubricating spherical plain bearings.

Keywords

Acknowledgements

The authors are grateful for financial support from the National Natural Science Foundation of China (Grant No.51275155), National High-tech R&D Program of China (No. 2015AA043004), and Outstanding Talent Fund Projects of Henan Province (No. 154200510013).

Citation

Qiu, M., Zhang, R., Li, Y., Du, H. and Pang, X.X. (2018), "Preparation and tribological properties of MoS2/graphite composite coatings modified by La2O3", Industrial Lubrication and Tribology, Vol. 70 No. 8, pp. 1422-1430. https://doi.org/10.1108/ILT-04-2017-0117

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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