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research-article

Tribological and vibration studies on newly developed nano-composite greases under boundary lubrication regime

[+] Author and Article Information
Jayant Singh

Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), Indian Institute of Technology Delhi, New Delhi-110016, India
singhjayant11@gmail.com

Deepak Kumar

Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), Indian Institute of Technology Delhi, New Delhi-110016, India
dkumar@itmmec.iitd.ernet.in

N. Tandon

Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), Indian Institute of Technology Delhi, New Delhi-110016, India
ntandon@itmmec.iitd.ernet.in

1Corresponding author.

ASME doi:10.1115/1.4038100 History: Received June 18, 2017; Revised September 16, 2017

Abstract

Greases are widely used in extreme conditions of load, speed and temperature, altogether with the improvement in the service life of the machinery by reducing the noise and vibration. The present study deals with the development of nano-composite greases and their tribo-dynamic evalution under boundary lubrication; anti-wear, extreme pressure and vibration behavior of non-conformal metallic contacts. The recording of the vibration signals constitutes the indirect approach to evaluate the lubricity of the tribological contacts. The different nano-additives (reduced graphene oxide (rGO) nano-sheets, CaCO3 and a-Al2O3 nanoparticles) are dispersed in commercial lithium grease to formulate nano-composite greases. The microstructural studies of greases are performed on high-resolution transmission electron microscopy (HRTEM). The boundary lubrication behaviour is studied using four-ball tester. Further, the functional groups of the greases and the chemistry of the worn surfaces is evaluated through Raman spectroscopy. To explore the involvement of wear mechanism(s), the morphology of worn surfaces is evaluated using scanning electron microscopy (SEM). The results showed that doping of 0.4% rGO and 5% CaCO3 in bare lithium grease can significantly improve the anti-wear, extreme pressure properties and vibration behavior, compared to a-Al2O3 dispersed composite grease.

Copyright (c) 2017 by ASME
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