Research Papers: Friction & Wear

The Wear and Friction Behavior of Novel Polytetrafluoroethylene/Expanded Graphite Nanocomposites for Tribology Application

[+] Author and Article Information
R. K. Goyal

Department of Metallurgy and
Materials Science,
College of Engineering,
Shivaji Nagar, Pune 411 005, India
e-mail: rkgoyal72@yahoo.co.in

M. Yadav

Department of Metallurgy and
Materials Science,
College of Engineering,
Shivaji Nagar, Pune 411 005, India

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 29, 2011; final manuscript received September 27, 2013; published online December 27, 2013. Assoc. Editor: Hong Liang.

J. Tribol 136(2), 021601 (Dec 27, 2013) (5 pages) Paper No: TRIB-11-1235; doi: 10.1115/1.4025655 History: Received December 29, 2011; Revised September 27, 2013

The tribological properties of polytetrafluoroethylene (PTFE)/expanded graphite (EG) nanocomposites were evaluated on a pin-on-disk wear tester under dry conditions for the first time. Scanning electron microscopy (SEM) was used to examine worn surfaces and debris of the worn samples. The wear rate and coefficient of friction of 2 wt. % EG filled nanocomposite were reduced approximately 162 times and 38%, respectively. The significant decrease in wear rate was attributed to a thin and tenacious transfer film on the counter-surface. However, when 5 wt. % EG was filled into the PTFE/EG nanocomposite, the wear rate did not decrease further.

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Grahic Jump Location
Fig. 1

SEM images of expanded graphite powder at magnifications of (a) 1000× and (b) 5000×

Grahic Jump Location
Fig. 2

SEM image of 0.5 wt. % expanded graphite filled polytetrafluoroethylene nanocomposite at ×2,000. Inset shows SEM image at ×10,000.

Grahic Jump Location
Fig. 3

Mass loss of polytetrafluoroethylene/expanded graphite nanocomposites as a function of sliding distance (load 25 N); inset shows mass loss for 2 wt. % and 5 wt. % expanded graphite nanocomposite under the similar test conditions

Grahic Jump Location
Fig. 4

Specific wear rate of polytetrafluoroethylene and its nanocomposites as a function of sliding distance (load: 25 N, speed: 1 m/s, sliding distance: 7 km)

Grahic Jump Location
Fig. 5

Specific wear rate of polytetrafluoroethylene/expanded graphite nanocomposites as a function of expanded graphite content in polytetrafluoroethylene matrix. The values shown above the bar are the sp. wear rate of nanocomposites after a sliding distance of 1 km and 7 km. For example, the sp. wear rate of pure polytetrafluoroethylene and 2 wt. % nanocomposite after a sliding distance of 7 km is 1323 × 10−6 mm−3/N·m and 8 × 10−6 mm−3/N·m, respectively.

Grahic Jump Location
Fig. 6

Digital camera photo of wear tracks of (a) and (b); pure polytetrafluoroethylene and (c) and; (d) 0.5 wt. % expanded graphite nanocomposites after 8 km sliding distance. Figures (b) and (d) are zoomed photos.

Grahic Jump Location
Fig. 7

Coefficient of friction of polytetrafluoroethylene/expanded graphite nanocomposites as a function of sliding distance

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Fig. 8

SEM images of (a) and (b) pure polytetrafluoroethylene; (c) and (d) 0.5 wt. % EG; and (e) and (f) 2 wt. % expanded graphite nanocomposites at magnification of x500 ((a), (c), (e)) and x2000 ((b), (d), (f)), respectively. Arrow shows the sliding direction.

Grahic Jump Location
Fig. 9

SEM images of debris (a) and (b) pure polytetrafluoroethylene; (c) and (d) 0.5 wt. % expanded graphite; and (e) and (f) 2 wt. %. Expanded graphite nanocomposites at magnification of x200 ((a), (c), (e)) and x500 ((b) (d), (f)), respectively.



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