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Title: Experimental evaluation of ball bearing performance using nanoflake-blended greases
Authors: Bhardwaj V.
Pandey R.K.
Agarwal V.K.
Published in: Journal of Testing and Evaluation
Abstract: Ball bearings encounter grease being pushed aside from the concentrated contact of their rolling elements and races due to the continuous motion of balls. This yields lubricant starvation at the contacts inside the bearings. In this situation, the tribological and vibration performances of ball bearings deteriorate. Therefore, improving the performance behaviors of ball bearings despite starvation is a vital research task. Thus, the objective of this paper was set to explore improving the performance behaviors of a ball bearing employing nanoflake (molybdenum disulfide (MoS ), tungsten disulfide, and hexagonal boron nitride)-blended greases. This paper reports the comparisons of frictional torque, temperature rise, and vibrations of test bearings lubricated with fresh and nanoflake-blended greases. The surfaces of races were examined after the experiments using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The surface topographies of races and balls were captured using a 3-D profilometer for comparison. The blended greases yielded significant reductions of 17-33, 16-23, and 8-64 % in frictional torque, temperature rise, and vibration, respectively. Surface analyses of races also revealed better tribofilm formation in the presence of MoS in grease compared with the other cases. 
Citation: Journal of Testing and Evaluation(2020), 49(5): -
Issue Date: 2020
Publisher: ASTM International
Keywords: Ball bearing
Frictional torque
Lubricant starvation
Temperature rise
ISSN: 903973
Author Scopus IDs: 57193618088
Author Affiliations: Bhardwaj, V., Centre for Automotive Research and Tribology, ITMMEC, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
Pandey, R.K., Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi,
Funding Details: The authors are grateful to staff members of Friction and Wear Laboratory (Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), Indian Institute of Technology (IIT) Delhi), SEM Laboratory (Central Research Facility, IIT Delh
Corresponding Author: Bhardwaj, V.; Centre for Automotive Research and Tribology, India; email:
Appears in Collections:Journal Publications [CH]

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