Investigation of the Tribological Properties of Surfactant-Modified MoS2 Microsized Spheres in Base Oil 500 SN

[+] Author and Article Information
Xun Fu1

 Qingdao University of Science and Technology, Qingdao, Shandong 266042, Chinafuxun4483@163.com

Xiaodong Zhou, Huaqiang Shi, Danmei Wu, Zhengshui Hu

 Qingdao University of Science and Technology, Qingdao, Shandong 266042, China


Corresponding author.

J. Tribol 129(4), 913-919 (Mar 26, 2007) (7 pages) doi:10.1115/1.2768612 History: Received September 20, 2006; Revised March 26, 2007

The tribological properties of MoS2 microsized spheres (MS-MoS2) with diameter of 0.53μm modified by self-prepared surfactant quaternary ammonium salt of 2-undecyl-1-dithioureido-ethyl-imidazoline (SUDEI) as an additive in base oil 500 SN were investigated and compared with those of commercial colloidal MoS2(CC-MoS2) on a four-ball tester and an Optimol SRV oscillating friction and wear tester in a ball-on-disk contact configuration. The worn surfaces of the bottom flat disk were examined with scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that the MoS2 microsized spheres product was a much better extreme-pressure additive and antiwear and friction-reduction additive in 500 SN than commercial colloidal MoS2(CC-MoS2). Under the appropriate concentration of 0.1% and 0.25% for MS-MoS2 and CC-MoS2 and the load of 400N, the friction coefficient of MS-MoS2/oil and CC-MoS2/oil decreased about 25.0% and 12.5% and the wear volume loss decreased about 50.4% and 12.9% compared with the pure base stock. The boundary lubrication mechanism could be deduced as the effective chemical adsorption film formed by the long chain alkyl (C11H23) and active elements (S and N) in the surfactant SUDEI and tribochemical reaction film composed of the tribochemical reaction products.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

TEM image of commercial colloidal MoS2 (a), SEM image of the surface-modified MoS2 microsized spheres (b), and XRD pattern of the MS-MoS2 sample annealed at 500°C for 2h under Ar flow (c)

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Figure 2

Structural formula of the main ingredient UDEI in the self-prepared surfactant SUDEI

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Figure 3

Friction coefficient (a) and wear volume loss (b) as a function of additive concentration (SRV, 1mm, 25Hz, 200N, 30min)

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Figure 4

Friction coefficient (a) and wear volume loss (b) as a function of applied load (SRV, 1mm, 25Hz, 30min)

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Figure 5

SEM morphologies of the worn surfaces lubricated with base oil alone (a) and (b), 0.25% CC-MoS2/oil (c) and (d), and 0.25% MS-MoS2/oil (e) and (f) at 200N

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Figure 6

XPS spectra of typical elements on the worn surface lubricated with 0.50% MS-MoS2/oil at 200N




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