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Hydrodynamic Lubrication

Micro-Magnetic Field Arrayed Surface for Ferrofluids Lubrication

[+] Author and Article Information
Sijie Liao, Wei Huang

 College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. C.

Xiaolei Wang1

 College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. C.wxl@nuaa.edu.cn

1

Corresponding author.

J. Tribol 134(2), 021701 (Mar 06, 2012) (7 pages) doi:10.1115/1.4005264 History: Received April 13, 2011; Revised October 03, 2011; Accepted October 05, 2011; Published March 06, 2012; Online March 06, 2012

CoNiMnP permanent magnetic films have been electroplated into arrayed round dimples (with diameters from 100 μm to 700 μm) machined on the substrate surface (316 stainless steel). These films could be magnetized and could generate the arrayed micro-magnetic field. Compared with normal surfaces (316 stainless steel flat surfaces without any dimples or coatings), the frictional properties of such magnetic surfaces were investigated under different loads and sliding speeds when lubricated with ferrofluids using a friction test rig. Much attention was paid to the effect of the dimple sizes on the lubrication properties. In addition, the magnetic properties of the dimples arrayed surface were analyzed by finite element analysis software (Ansoft Maxwell 3D). The results show that there exists the optimized geometrical parameter of the arrayed magnetic surface, which displays the best tribological performance when lubricated with ferrofluids.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Diagram of CoNiMnP film in dimple covered with FF

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Figure 2

Calculation model of the magnet arrayed surface

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Figure 3

H evolution on model surface (d = 500 μm, r = 5%)

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Figure 4

Average H on dimple boundary of model with different d

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Figure 5

H distribution on surface of different area ratio ((a) r = 5%, (b) r = 10%, (c) r = 15%, and (d) r = 20%)

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Figure 6

Fabrication process: (a) polished substrate, (b) spin coat photoresist, (c) photolithography, (d) electrolytic etching, (e) electrodepositing, and (f) photoresist stripping and magnetizing

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Figure 7

SEM photos and EDS of CoNiMnP films ((a) SEM image of CoNiMnP films and (b) the EDS spectrum of the films)

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Figure 8

B-H hysteresis loops of CoNiMnP films in the parallel and perpendicular direction

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Figure 9

Optical photos of specimens with and without FF

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Figure 10

The scheme of the experimental apparatus and specimens, (a) pin-on-disk test rig and (b) lower and upper specimens

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Figure 11

Friction coefficient versus v of magnetic surface specimen and normal surface specimen, (a) specimen No. 13 (d = 400 μm, r = 5%) and (b) normal surface specimen No. 25

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Figure 12

Original friction curves of specimens No. 13 and No. 25

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Figure 13

Friction coefficient versus v of specimens with different d and normal surfaces under different loads

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Figure 14

Friction coefficient versus r under different experimental conditions

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