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research-article

Tribo-investigations on oils with dispersants and hBN particles

[+] Author and Article Information
Manoj Kumar Gupta

Industrial Tribology Machine Dynamics and Maintenance Engineering Centre, Indian Institute of Technology Delhi, India – 110016
manoj2012kgupta@gmail.com

Jayashree Bijwe

Industrial Tribology Machine Dynamics and Maintenance Engineering Centre, Indian Institute of Technology Delhi, India – 110016
jbijwe@gmail.com

Ajay Kumar Kadiyala

Industrial Tribology Machine Dynamics and Maintenance Engineering Centre, Indian Institute of Technology Delhi, India – 110016
ajay.kadiyala@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4038105 History: Received June 29, 2017; Revised September 26, 2017

Abstract

A dispersant is almost an unavoidable additive in engine oils since it helps to keep the carbonaceous particles in a suspended form. Dispersants can be multifunctional and can therefore interfere with the functions of other additives either synergistically or antagonistically. The present work investigated the influence of four dispersants (with and without particles of hexagonal boron nitride-hBN) on selected lubrication-related properties of the oils using four ball tester. Particles of hBN, though known as effective anti-wear (AW) and anti-friction (AF) additive, did not prove effective in oil in the presence of dispersants. On the other hand, it proved to be a good extreme pressure (EP) additive by showing 27 % improvement in weld-load (WL). Worn surfaces were examined using scanning electron microscopy (SEM), energy dispersion X-ray analysis (EDAX) and Raman spectroscopy (RS).

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