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Research Papers: Lubricants

Tribological Characteristics Modification of Magnetorheological Fluid

[+] Author and Article Information
Chul Hee Lee1

e-mail: chulhee@inha.ac.krDepartment of Mechanical Engineering,  Inha University, Incheon 402-751, Korea R & D Center, Chang Am LS Co., Asan-City, ChoongChungNam-Do 336-857, Korea

Deuk Won Lee, Jae Young Choi, Seung Bok Choi, Won Oh Cho, Hyuk Chae Yun

e-mail: chulhee@inha.ac.krDepartment of Mechanical Engineering,  Inha University, Incheon 402-751, Korea R & D Center, Chang Am LS Co., Asan-City, ChoongChungNam-Do 336-857, Korea

1

Corresponding author.

J. Tribol 133(3), 031801 (Jul 21, 2011) (6 pages) doi:10.1115/1.4004106 History: Received January 29, 2011; Revised April 01, 2011; Published July 21, 2011; Online July 21, 2011

Recently, research on the application of magnetorheological (MR) fluid in mechanical engineering has been widely expanded, while the performance of MR fluid in tribology has also been investigated. In this study, a modification of MR fluid, which is modified by adding certain additives, is attempted to improve tribological performance. After modification, wear and friction are measured by four-ball wear tester and linear-oscillation (SRV) tester under no magnetic fields. Subsequently, the oxidation induction time (OIT) is evaluated by pressure differential scanning calorimetry (PDSC). Then, to observe the tribological performance under magnetic fields, pin-on-disk test is conducted to confirm the effects of the commercial MR fluid and modified MR fluid on friction and wear in different operating and magnetic conditions. Also, the modification effects on surface roughness are investigated by using a profilometer. Moreover, the microscopic changes of surfaces and MR particles are investigated by using scanning electron microscopy (SEM).

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Pin-on-disk testing apparatus

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Figure 2

Measurement of friction coefficient using SRV

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Figure 3

Wear scar after four-ball wear test; (a) with commercial MR fluid and (b) with modified MR fluid

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Figure 4

Measurement of oxidation induction time (OIT)

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Figure 5

Measurement of friction coefficient using pin-on-disk tester: (a) test 1, (b) test 2, and (c) test 3

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Figure 6

Measurement of the removal rate using pin-on-disk tester: (a) test 1, (b) test 2, and (c) test 3

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Figure 7

SEM image of CI-particles after pin-on-disk test: (a) with commercial MR fluid and (b) with modified MR fluid

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Figure 8

SEM images of disk after pin-on-disk test: (a) with commercial MR fluid and (b) with modified MR fluid

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