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Research Papers: Coatings & Solid Lubricants

Tribological Behaviors of PTFE-Based Composites Filled With Nanoscale Lamellar Structure Expanded Graphite

[+] Author and Article Information
Yu-lin Yang

College of Mechanical Engineering and National College of Defense Technology, Yanshan University, Qinhuangdao 066004, P. R. China

Zhi-ning Jia

College of Mechanical Engineering and National College of Defense Technology, Yanshan University, Qinhuangdao 066004, P. R. China; Chengde Petroleum College, Chengde 067000, P. R. Chinaysujia@163.com

Jin-jiang Chen

College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, P. R. China

Bing-li Fan

National College of Defense Technology, Yanshan University, Qinhuangdao 066004, P. R. China

J. Tribol 132(3), 031301 (Jun 15, 2010) (7 pages) doi:10.1115/1.4001546 History: Received June 26, 2009; Revised March 23, 2010; Published June 15, 2010; Online June 15, 2010

This paper provides a polytetrafluoroethylene (PTFE)/nano-EG solid self-lubricating composite that exhibits very low friction coefficient and wear rate. In present study, the influences of the content of expanded graphite with nanoscale lamellar structure (nano-EG) in PTFE/nano-EG composite, normal contact pressure, and sliding velocity on tribological properties were studied by using the MMU-5G friction and wear tester sliding against AISI-1045 steel. Meanwhile, the property of nano-EG was characterized by utilizing a field emission scanning electron microscope. Compared with that of pure PTFE, the addition of nano-EG into PTFE matrix effectively improved the antifriction and wear resistance properties of PTFE/nano-EG composite. The highest wear resistance was found for the PTFE/nano-EG composite filled with 15wt% nano-EG. The morphologies of worn surface of the ANSI-1045 steel and composites were observed using a confocal laser scanning microscopy (CLSM) and a scanning electron microscope (SEM) to examine composite microstructures and to study modes of failure. The images of CLSM and SEM indicate that the property of transfer film generated on the surface of mating pair is likely responsible for the lower wear rate observed in these experiments.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flow chart of preparing nano-EG by chemical method

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Figure 2

SEM micrograph of wormlike expanded graphite

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Figure 3

Images of FESEM for nano-EG: (a) denotes the whole micrograph and (b) indicates the enlarged micrograph in the rectangular region

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Figure 4

Sketch of end-face friction and wear pair

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Figure 5

Friction coefficient and wear rate for the PTFE/nano-EG composites plotted a function of nano-EG content

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Figure 6

Friction coefficient and wear rate for the PTFE/nano-EG composites plotted as a function of normal contact pressure

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Figure 7

Frictional coefficient and wear rate for the PTFE/nano-EG composites plotted as a function of sliding velocity

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Figure 8

CLSM micrographs of the worn surface for the pure PTFE sample: (a) plane view and (b) 3D surface morphology

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Figure 9

CLSM micrographs of the worn surface for the PTFE/nano-EG composite

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Figure 10

SEM images of worn surface of PTFE/nano-EG composite at different loads

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Figure 11

SEM images of worn surface of PTFE/nano-EG composite at different sliding velocity

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Figure 12

CLSM micrographs of the transfer film generated on upper specimen surface

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