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Research Papers: Lubricants

Experimental Research on Tribological Properties of Mn0.78Zn0.22Fe2O4 Magnetic Fluids

[+] Author and Article Information
Wang Li-jun

 China University of Mining and Technology, Xuzhou, Jiangsu 221116, P.R.C.; Kokushikan University, 4-28-1 Setagaya, Setagaya-ku, Tokyo 154-8515, Japan

Guo Chu-wen

 China University of Mining and Technology, Xuzhou, Jiangsu 221116, P.R.C.

Ryuichiro Yamane

 Kokushikan University, 4-28-1 Setagaya, Setagaya-ku, Tokyo 154-8515, Japan

J. Tribol 130(3), 031801 (Jun 23, 2008) (5 pages) doi:10.1115/1.2913539 History: Received November 17, 2007; Revised March 19, 2008; Published June 23, 2008

The synthesis and application of nanometer-sized particles have received considerable attention in recent years because of their different physical and chemical properties from those of the bulk materials or individual molecules; however, few experimental investigations on the tribological properties of lubricating oils with and without nanoferromagnetic particles have been performed. This work investigates the tribological properties of Mn0.78Zn0.22Fe2O4 nanoferromagnetic as additive in 46# turbine oil using a four-ball friction and wear tester. It is shown that the 46# turbine oil containing Mn0.78Zn0.22Fe2O4 nanoparticles has much better friction reduction and antiwear abilities than the base oil. The 46# turbine oil doped with 6wt%Mn0.78Zn0.22Fe2O4 nanoparticles show the best tribological properties among the tested oil samples, and PB value is increased by 26%, and the decreasing percentage of wear scar diameter is 25.45% compared to base oil.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

TEM images of Mn0.78Zn0.22Fe2O4 nanoparticle 60,000×

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Figure 2

Wear scar diameter as functions of applied load lubricated with different mass percentage of Mn0.78Zn0.22Fe2O4 particles (four-ball, 1450rpm, 392N, 60min)

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Figure 3

Friction coefficient as function of applied load lubricated with different mass percentages of Mn0.78Zn0.22Fe2O4 particles (four-ball, 1450rpm, 392N, 60min)

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Figure 4

SEM morphologies of the worn steel surfaces lubricated with 46# turbine oil

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Figure 5

SEM morphologies of the worn steel surfaces lubricated with 0.5wt%Mn0.78Zn0.22Fe2O4

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Figure 6

SEM morphologies of the worn steel surfaces lubricated with 1wt%Mn0.78Zn0.22Fe2O4

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Figure 7

SEM morphologies of the worn steel surfaces lubricated with 3wt%Mn0.78Zn0.22Fe2O4

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Figure 8

SEM morphologies of the worn steel surfaces lubricated with 6wt%Mn0.78Zn0.22Fe2O4

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Figure 9

EDS spectra of elements on worn steel surface lubricated with 46# turbine oil and 46# turbine oil- 6.0wt%Mn0.78Zn0.22Fe2O4 (a) Base oil; (b) 46# turbine oil- 6.0wt%Mn0.78Zn0.22Fe2O4

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