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Research Papers: Coatings and Solid Lubricants

Tribological Behavior of Polytetrafluoroethylene: Effect of Sliding Motion

[+] Author and Article Information
Wang Shibo

School of Mechanic and Electronic Engineering,
China University of Mining and Technology,
Xu Zhou 221116, China
e-mail: wangshb@cumt.edu.cn

Chengchao Niu

School of Mechanic and Electronic Engineering,
China University of Mining and Technology,
Xu Zhou 221116, China
e-mail: niuchengchao66@163.com

Bing Teng

School of Mechanic and Electronic Engineering,
China University of Mining and Technology,
Xu Zhou 221116, China
e-mail: 725591433@qq.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 30, 2015; final manuscript received January 25, 2016; published online July 20, 2016. Assoc. Editor: Mircea Teodorescu.

J. Tribol 139(1), 011301 (Jul 20, 2016) (7 pages) Paper No: TRIB-15-1390; doi: 10.1115/1.4033130 History: Received October 30, 2015; Revised January 25, 2016

Wear characteristics were influenced by the parameters of wear-testing apparatus including configuration of contact surface and form of the relative motion. The tribological behavior of polytetrafluoroethylene (PTFE) disk against AISI1045 steel pin under unidirectionally rotating, linearly reciprocating, and torsional motion was studied. The friction coefficients under unidirectional rotating, linearly reciprocating and torsional motion were 0.1, 0.118 and 0.12, respectively. The highest wear mass loss of PTFE was obtained under linearly reciprocating. The wear mass loss under torsional motion was lowest. The wear mechanism of PTFE under unidirectional rotating, linearly reciprocating, and torsional motion was slight plowing, serious abrasive wear, and adhesive wear, respectively. Through finite element analysis, a higher normal stress induced by the edge effect of steel pin promoted a higher shear stress in PTFE disk. The plastic ratcheting mechanism occurred on the contact edge when the steel pin entered and exited the contact zone, as led to higher wear mass loss under linearly reciprocating and unidirectional rotation. The plastic ratcheting mechanism did not occur under torsional motion. Different transfer films with various topographies were formed on the steel pins under the three motions.

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Figures

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Fig. 1

Pin-on-disk structural counter pair under (a) unidirectional rotation, (b) linearly reciprocating, and (c) torsional motion

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Fig. 2

Schematic of (a) unidirectional rotation friction tester and (b) torsion friction tester

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Fig. 3

Friction coefficients (a) and wear mass loss and (b) of PTFE under three kinds of motion with a 123 N normal load

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Fig. 4

SEM photographs of worn surface of PTFE under three sliding motions: (a) unidirectional rotation, (b) linearly reciprocating, and (c) torsion

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Fig. 5

FEA model under three sliding motions: (a) unidirectional rotation, (b) linearly reciprocating, and (c) torsion

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Fig. 6

Evolution of normal stress at the different contact regions under three sliding motions: (a) unidirectional rotation, (b) linearly reciprocating, and (c) torsion

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Fig. 7

Plastic ratcheting induced by contact pressure and stress concentration at the edges of a steel pin on a PTFE disk [23]

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Fig. 8

SEM photographs of the worn surfaces of AISI1045 steel under three sliding motions: (a) Unidirectional rotation, (b) linearly reciprocating, and (c) torsion

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