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Research Papers: Mixed and Boundary Lubrication

Pristine and Alkylated MoS2 Nanosheets for Enhancement of Tribological Performance of Paraffin Grease Under Boundary Lubrication Regime

[+] Author and Article Information
Sooraj S. Rawat

Department of Mechanical Engineering,
Indian Institute of Technology (Banaras Hindu University),
Varanasi 221005, Uttar Pradesh, India
e-mail: soorajsr.rs.mec15@itbhu.ac.in

A. P. Harsha

Department of Mechanical Engineering,
Indian Institute of Technology (Banaras Hindu University),
Varanasi 221005, Uttar Pradesh, India
e-mail: apharsha.mec@itbhu.ac.in

Deepak P. Agarwal

Department of Mechanical Engineering,
Indian Institute of Technology (Banaras Hindu University),
Varanasi 221005, Uttar Pradesh, India
e-mail: agarwal.pdeepak.mec12@itbhu.ac.in

Sangita Kumari

CSIR-Indian Institute of Petroleum,
Dehradun 248005, Uttarakhand, India
e-mail: kushwahasangita@gmail.com

Om P. Khatri

CSIR-Indian Institute of Petroleum,
Dehradun 248005, Uttarakhand, India
e-mail: opkhatri@iip.res.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received January 23, 2019; final manuscript received April 22, 2019; published online May 15, 2019. Assoc. Editor: Min Zou.

J. Tribol 141(7), 072102 (May 15, 2019) (12 pages) Paper No: TRIB-19-1035; doi: 10.1115/1.4043606 History: Received January 23, 2019; Accepted April 22, 2019

In the present study, lubricating grease was developed with paraffin oil and 12-lithium hydroxy stearate metal soap as a thickening agent. MoS2 nanosheets were synthesized by hydrothermal method and functionalized with 1-octadecanethiol (i.e., MoS2-ODT). The MoS2 and MoS2-ODT nanosheets were dispersed in the grease with different concentrations to evaluate its tribological performance. Tribological results unveiled that the addition of MoS2 nanosheets in grease appreciably reduced the coefficient of friction and mean wear volume of tribo-interfaces as compared with pure grease. Energy dispersive spectroscopy (EDS) spectrum revealed the deposition of MoS2 on the worn surface and confirmed a thin tribo-film which protects steel tribo-pair against wear.

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Figures

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Fig. 1

Flowchart showing the synthesis of MoS2 nanosheets by a hydrothermal approach

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Fig. 2

Low- and high-resolution TEM images of (a) and (b) MoS2 and (d) and (e) MoS2-ODT nanosheets. TEM micrographs of (c) MoS2 and (f) MoS2-ODT along with the corresponding area elemental mapping. The lamellar structure of MoS2 along with interlayer spacing is explicitly seen in high-resolution images.

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Fig. 3

X-ray diffraction patterns of (a) MoS2 and (b) MoS2-ODT nanosheets

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Fig. 4

FTIR spectra of (a) MoS2 and (b) MoS2-ODT nanosheets along with assignments of vibrational features. The inset graphs of MoS2 and MoS2-ODT nanosheets illustrate the Mo-S stretching mode.

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Fig. 5

Thermal degradation patterns of MoS2 and MoS2-ODT nanosheets. The inset graph shows the derivative weight as a function of temperature.

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Fig. 6

Paraffin greases having a variable dose of MoS2 nanosheets: (a) 0.01 wt%, (b) 0.02 wt%, (c) 0.03 wt%, (d) 0.04 wt%, and (e) 0.05 wt%

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Fig. 7

Thermal degradation patterns of paraffin grease doped with 0.04 wt% of (a) MoS2 and (b) MoS2-ODT nanosheets

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Fig. 8

(a) The effect of various concentrations of MoS2 and MoS2-ODT nanosheets in the paraffin grease on the average coefficient of friction and (b) variations of coefficient of friction with time at an optimized concentration of MoS2 (0.04 wt%) and MoS2-ODT (0.01 wt%) nanosheets in the paraffin grease. (c) Wear scar diameter and (d) mean wear volume as a function of the doping concentration of MoS2 and MoS2-ODT nanosheets in the paraffin grease. Percentage reductions in the MWV, WSD, and COF with different concentrations of (e) MoS2 and (f) MoS2-ODT nanosheets in the paraffin grease.

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Fig. 9

Scanning electron images of worn surfaces of steel balls used for the tribo-tests in the presence of (a) and (b) paraffin grease, (c) and (d) 0.04 wt% MoS2-doped grease, and (e) and (f) 0.04 wt% MoS2-ODT-doped grease

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Fig. 10

Topographic images of the worn surfaces of steel balls used in the tribo-tests in the presence of (a) and (b) paraffin grease, (c) and (d) 0.04 wt% MoS2-doped grease, and (e) and (f) 0.04 wt% MoS2-ODT-doped grease. (g) Linear roughness profiles of worn surfaces extracted from topographic images scanned by the AFM.

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Fig. 11

EDS spectra with elemental mapping of worn surfaces of (a) pure grease, (b) 0.04 wt% MoS2-doped paraffin grease, and (c) 0.04 wt% MoS2-ODT-doped paraffin grease

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Fig. 12

Plausible lubrication mechanism revealing the role of MoS2 nanosheets under the tribo-stress

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