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Published in: Tribology Letters 2/2016

01-08-2016 | Original Paper

Temperature-Dependent Friction and Wear Behavior of PTFE and MoS2

Authors: T. F. Babuska, A. A. Pitenis, M. R. Jones, B. L. Nation, W. G. Sawyer, N. Argibay

Published in: Tribology Letters | Issue 2/2016

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Abstract

An investigation of the temperature-dependent friction behavior of PTFE, MoS2, and PTFE-on-MoS2 is presented. Friction behavior was measured while continuously varying contact temperature in the range −150 to 175 °C while sliding in dry nitrogen, as well as for self-mated PTFE immersed in liquid nitrogen. These results contrast with previous reports of high-friction transitions and plateaus for pure and composite MoS2 at temperatures below about −20 °C; instead, we have found persistently weak thermal behavior between 0 and −196 °C, providing new insight about the molecular mechanisms of macroscale friction. The temperature-dependent friction behavior characteristic of self-mated PTFE was found also for PTFE-on-MoS2 sliding contacts, suggesting that PTFE friction was defined by subsurface deformation mechanisms and internal friction even when sliding against a lamellar lubricant with extremely low friction coefficient (µ ~ 0.02). The various relaxation temperatures of PTFE were found in the temperature-dependent friction behavior, showing excellent agreement with reported values acquired using rheological techniques measuring energy dissipation through internal friction. Additionally, hysteresis in friction behavior suggests an increase in near-surface crystallinity upon exceeding the high-temperature relaxation, T α  ~ 116 °C.

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Metadata
Title
Temperature-Dependent Friction and Wear Behavior of PTFE and MoS2
Authors
T. F. Babuska
A. A. Pitenis
M. R. Jones
B. L. Nation
W. G. Sawyer
N. Argibay
Publication date
01-08-2016
Publisher
Springer US
Published in
Tribology Letters / Issue 2/2016
Print ISSN: 1023-8883
Electronic ISSN: 1573-2711
DOI
https://doi.org/10.1007/s11249-016-0702-y

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