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Microstructure and tribological property of self-lubrication CBN abrasive composites containing molybdenum disulfide

Biao Zhao (National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Wenfeng Ding (National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Weijie Kuang (National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Yucan Fu (National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 19 July 2019

Issue publication date: 22 August 2019

Abstract

Purpose

This paper aims to evaluate the influence of molybdenum disulfide (MoS2) concentrations (5, 7.5, 10, 12.5 and 15 Wt.%) on the microstructure and tribological property of the self-lubrication cubic boron nitride (CBN) abrasive composites.

Design/methodology/approach

Three point bending method and rotating sliding test are used to evaluate the flexural strength and tribological property of self-lubricating CBN abrasive composites. Microstructure, wear morphology of the ball and scratch are supported by scanning electron microscopy, optical microscope and three-dimensional confocal microscopy, etc.

Findings

The MoS2 concentration has a significant influence on the interface microstructure between CBN abrasives and matrix alloys, and thus, affects the flexural strength of CBN abrasive composites. The grain fracture modes of CBN abrasive composites are transformed from the transgranular fracture into intergranular fracture as the MoS2 concentrations increase. Additionally, the friction coefficient of as-sintered samples decreases with the MoS2 concentrations. The MoS2 concentrations of 10 Wt.% are final determined to fabricate self-lubricating composites in basis of the mechanical and lubricating property.

Originality/value

The ball is fabricated under vacuum sintering process. The tribological property of self-lubricating CBN abrasive composites is evaluated in terms of the friction coefficient and morphologies of the ball and scratches after rotating sliding tests.

Keywords

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (No. 51775275 and 51705463), the Fundamental Research Funds for the Central Universities (No. NP2018110), the Six Talents Summit Project in Jiangsu Province (No. JXQC-002) and the Funding for Outstanding Doctoral Dissertation in NUAA (No. BCXJ18-05).

Citation

Zhao, B., Ding, W., Kuang, W. and Fu, Y. (2019), "Microstructure and tribological property of self-lubrication CBN abrasive composites containing molybdenum disulfide", Industrial Lubrication and Tribology, Vol. 71 No. 5, pp. 712-717. https://doi.org/10.1108/ILT-04-2019-0114

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited