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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July 2017
Research-Article
Tribological Studies of Transmission Oil Dispersed With Molybdenum Disulfide and Tungsten Disulfide Nanoparticles
V. Srinivas,
V. Srinivas
Professor
Department of Mechanical Engineering,
GITAM University,
Visakhapatnam 530045, India
e-mail: vsvas1973@yahoo.com
Department of Mechanical Engineering,
GITAM University,
Visakhapatnam 530045, India
e-mail: vsvas1973@yahoo.com
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M. Saratchandra Babu
M. Saratchandra Babu
Professor
Department of Chemistry,
GITAM University,
Visakhapatnam 530045, India
e-mail: mscbabu@yahoo.com
Department of Chemistry,
GITAM University,
Visakhapatnam 530045, India
e-mail: mscbabu@yahoo.com
Search for other works by this author on:
V. Srinivas
Professor
Department of Mechanical Engineering,
GITAM University,
Visakhapatnam 530045, India
e-mail: vsvas1973@yahoo.com
Department of Mechanical Engineering,
GITAM University,
Visakhapatnam 530045, India
e-mail: vsvas1973@yahoo.com
R. N. Thakur
A. K. Jain
M. Saratchandra Babu
Professor
Department of Chemistry,
GITAM University,
Visakhapatnam 530045, India
e-mail: mscbabu@yahoo.com
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. Jul 2017, 139(4): 041301 (6 pages)
Published Online: March 20, 2017
Article history
Received:
April 16, 2016
Revised:
September 8, 2016
Citation
Srinivas, V., Thakur, R. N., Jain, A. K., and Saratchandra Babu, M. (March 20, 2017). "Tribological Studies of Transmission Oil Dispersed With Molybdenum Disulfide and Tungsten Disulfide Nanoparticles." ASME. J. Tribol. July 2017; 139(4): 041301. https://doi.org/10.1115/1.4034766
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