Research Papers: Micro-Nano Tribology

Tribological and Vibration Studies on Newly Developed Nanocomposite Greases Under Boundary Lubrication Regime

[+] Author and Article Information
Jayant Singh, N. Tandon

Industrial Tribology, Machine Dynamics and
Maintenance Engineering Centre (ITMMEC),
Indian Institute of Technology Delhi,
New Delhi 110016, India

Deepak Kumar

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

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 18, 2017; final manuscript received September 16, 2017; published online October 23, 2017. Assoc. Editor: Dae-Eun Kim.

J. Tribol 140(3), 032001 (Oct 23, 2017) (10 pages) Paper No: TRIB-17-1238; doi: 10.1115/1.4038100 History: Received June 18, 2017; Revised September 16, 2017

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 nanocomposite greases and their tribodynamic evaluation under boundary lubrication (BL), antiwear, extreme pressure (EP), and vibration behavior of nonconformal 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) nanosheets, CaCO3, and α-Al2O3 nanoparticles) are dispersed in commercial lithium grease to formulate nanocomposite greases. The microstructural studies of greases are performed on high-resolution transmission electron microscopy (HRTEM). The BL behavior is studied using four ball tester. Further, the functional groups of the greases and the chemistry of the worn surfaces are evaluated through Raman spectroscopy (RS). 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 antiwear, EP properties, and vibration behavior, compared to α-Al2O3 dispersed composite grease.

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Fig. 1

Schematic diagram representing the experimental setup

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Fig. 2

HRTEM morphology of (a) rGO nanosheets, (b) CaCO3, (c) α-Al2O3 nanoparticles and images of (d) BG, (e) BG + rGO, (f) BG + CaCO3, and (g) BG + α-Al2O3, after draining the oil content from the grease samples

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Fig. 3

Raman spectroscopy of (a) bare nano-additives and (b) nanocomposite greases

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Fig. 4

Variation of FT (N·m) with time for BG and nanocomposite greases

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Fig. 5

COF and WSD as the function of additives concentrations in BG

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Fig. 6

Vibration signals for 900 s under dry conditions at 1200 RPM, 392 N and 75 °C

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Fig. 7

Vibration signals at the initial stage of experimentation on four ball tester at 10 s for (a) BG, (b) BG + 0.4% rGO, (c) BG + 5% CaCO3, and (d) BG + 0.8% Al2O3

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Fig. 8

Vibration signals at finishing stage of experimentation on four ball tester at 3500 s for (a) BG, (b) BG + 0.4% rGO, (c) BG + 5% CaCO3, and (d) BG + 0.8% Al2O3

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Fig. 9

Maximum nonseizure load and weld load as a function of nano-additives concentrations (ASTM D 2596)

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Fig. 10

SEM micrographs of wear scar of stationary steel balls after the wear test at 1200 rpm, 392N, 75 °C

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Fig. 11

Wear scar profiles of stationary balls measured through optical profilometer, lubricated with BG and nanocomposite greases

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Fig. 12

SEM micrographs of worn surfaces of stationary steel balls after performing the EP test at nonseizure load lubricated with (a) BG, (b) BG + 0.4% rGO, (c) BG + 5% CaCO3, and (d) BG + 0.8% Al2O3

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Fig. 13

Raman spectra of fresh and worn steel balls lubricated with BG and nanocomposite greases after the antiwear test at 392 N, 1200 rpm, and 75 °C

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Fig. 14

Schematic diagram explaining the role of rGO nanosheets participating in the friction process



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