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Friction & Wear

Wear and Friction of Carbon Nanofiber-Reinforced HDPE Composites

[+] Author and Article Information
Songbo Xu, Aydar Akchurin, Tian Liu, Weston Wood, Iskander S. Akhatov, Wei-Hong Zhong

Department of Mechanical Engineering,  North Dakota State University, Fargo, ND 58108School of Mechanical and Materials Engineering,  Washington State University, Pullman, WA 99164

X. W. Tangpong1

Department of Mechanical Engineering,  North Dakota State University, Fargo, ND 58108Annie.Tangpong@ndsu.eduSchool of Mechanical and Materials Engineering,  Washington State University, Pullman, WA 99164Annie.Tangpong@ndsu.edu

1

Corresponding author.

J. Tribol 134(4), 041602 (Aug 21, 2012) (7 pages) doi:10.1115/1.4007016 History: Received May 02, 2012; Revised June 24, 2012; Published August 21, 2012; Online August 21, 2012

New applications of carbon-based materials have been continuously developed in recent years. Carbon nanofibers (CNFs) with silane coatings were added into high density polyethylene (HDPE) to improve the tribological properties of the nanocomposite material. The nanocomposites were fabricated with various weight percentages of carbon nanofibers (0.5 wt.%, 1 wt.% and 3 wt.%) that were treated with different silane coating thicknesses (2.8 nm and 46 nm) through melt-mixing and compressive processing. The wear and friction tests were performed on a pin-on-disc tribometer under phosphate buffered saline lubricated condition. Compared with the neat HDPE, the friction coefficients of the nanocomposites were reduced in all samples, yet only a couple of nanocomposite samples showed lower wear rates. Micro-hardness measurements of the nanocomposites were carried out and CNFs were found to be capable of increasing the material’s micro-hardness. The effects of concentration and silane coating thickness of CNFs on the tribological properties of the resulting nanocomposites were analyzed and the wear mechanisms of the HDPE/CNF nanocomposites were discussed.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of contact profile of the wear track

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Figure 2

Comparison of micro-hardness values of ten samples; Neat: neat HDPE. P-0.5: HDPE with 0.5 wt.% of pristine CNFs. T1-0.5: HDPE with 0.5 wt.% of oxidized CNFs with thick silane coating (see Table 1).

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Figure 3

Variations of the coefficients of friction over time for the comparison of different CNFs concentrations

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Figure 4

Variations of the coefficients of friction over time for the comparison of different CNFs treatments

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Figure 5

Coefficients of friction of the ten samples in contact with steel ball in saline lubricated condition (See Fig. 2 caption for notation of the sample names.)

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Figure 6

FESEM micrographs (scale bar: 20 μm; insert: 2 μm) for the fracture surfaces of HDPE nanocomposites reinforced by CNFs-P (a), CNFs-T2 (b) and CNFs-T1 (c). The fiber loadings of all nanocomposites were 3 wt.%.

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Figure 7

Comparison of the wear rates of the ten samples

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Figure 8

Optical microscopy and SEM images of worn surfaces of: (a), (c) and (e): HDPE/CNF-T1-0.5; (b), (d) and (f): HDPE/CNF -P-3

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Figure 9

XRD patterns of wear debris from HDPE nanocomposites with CNF-P-1, CNF-T1-1 and CNF-P-3

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