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Research Papers: Coatings and Solid Lubricants

Tribological Studies of Transmission Oil Dispersed With Molybdenum Disulfide and Tungsten Disulfide Nanoparticles

[+] Author and Article Information
V. Srinivas

Professor
Department of Mechanical Engineering,
GITAM University,
Visakhapatnam 530045, India
e-mail: vsvas1973@yahoo.com

R. N. Thakur

Hindustan Petroleum Corporation Ltd.,
Visakhapatnam 530014, India
e-mail: ravidranthakur@hpcl.in

A. K. Jain

Hindustan Petroleum Corporation Ltd.,
Mumbai 400705, India
e-mail: akjain@hpcl.in

M. Saratchandra Babu

Professor
Department of Chemistry,
GITAM University,
Visakhapatnam 530045, India
e-mail: mscbabu@yahoo.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 16, 2016; final manuscript received September 8, 2016; published online March 20, 2017. Assoc. Editor: Ning Ren.

J. Tribol 139(4), 041301 (Mar 20, 2017) (6 pages) Paper No: TRIB-16-1130; doi: 10.1115/1.4034766 History: Received April 16, 2016; Revised September 08, 2016

This paper compares the tribological properties of transmission oil dispersed with molybdenum disulfide (MoS2) and tungsten disulfide (WS2) nanoparticles. Lubricant samples are prepared by dispersing MoS2 and WS2 nanoparticles in 0.5 wt.% in transmission oil. The nanoparticles are stabilized in the lubricant by surface modification with surfactant SPAN 80. The stability of the lubricant in terms of size variation of dispersed nanoparticles is evaluated using particle size analyzer. The antiwear, antifriction, and extreme pressure (EP) properties are tested on a four-ball wear tester and a comparison is made to assess the relative performance of MoS2 and WS2 nanoparticles. The friction and wear characteristics of lubricant dispersed with nanoparticles are strongly dependent upon the load taken into consideration. The lubricant dispersed with WS2 nanoparticles gave higher weld load and load wear index (LWI) than that of lubricant dispersed with MoS2 nanoparticles. The metallographic studies show that under high load conditions, the WS2 nanoparticles deposit more than MoS2 nanoparticles, thereby giving better performance at higher load conditions.

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Figures

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Fig. 1

HRSEM images of nanopowders (a) MoS2 nanopowder and (b) WS2 nanopowder

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Fig. 2

MoS2 particle size profile in nanofluid suspension (a) immediately after preparation and (b) 15 days after preparation

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Fig. 3

WS2 particle size profile in nanofluid suspension (a) immediately after preparation and (b) 15 days after preparation

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Fig. 4

Trends of repeated experimental results of test oils (a) wear scar diameter and (b) friction coefficient

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Fig. 5

Variation of friction torque with time during friction test

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Fig. 6

Variation of Scar Diameter with applied load during EP test

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Fig. 7

Figure showing EDX spectra on wear scar during friction test (a) base lubricant, (b) base lubricant dispersed with WS2, and (c) base lubricant dispersed with MoS2

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Fig. 8

Figure showing EDX spectra on wear scar during EP test (a) base lubricant, (b) base lubricant dispersed with WS2, and (c) base lubricant dispersed with MoS2

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