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Title: Temperature-Dependent Friction and Wear Behavior of PTFE and MoS 2

We present an investigation of the temperature-dependent friction behavior of PTFE, MoS 2, and PTFE-on- MoS 2. 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 monotonic inverse temperature dependent friction behavior, as well as reported high-friction transitions and plateaus at temperatures below about -20°C that were not observed, providing new insights about the molecular mechanisms of macro-scale friction. The temperature-dependent friction behavior characteristic of self-mated PTFE was found also on the PTFE-on-MoS 2 sliding contact, suggesting that PTFE friction was defined by sub-surface 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 torsional techniques measuring internal friction. Additionally, hysteresis in friction behavior suggests an increase in near-surface crystallinity at upon exceeding the high temperature relaxation, T α~ 116°C.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials Science and Engineering Center
  2. Univ. of Florida, Gainesville, FL (United States). Dept. of Mechanical and Aerospace Engineering
Publication Date:
Report Number(s):
SAND2016-7052J
Journal ID: ISSN 1023-8883; PII: 702
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Tribology Letters
Additional Journal Information:
Journal Volume: 63; Journal Issue: 2; Journal ID: ISSN 1023-8883
Publisher:
Springer
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Cryogenic; Temperature; disulfide; MoS2; Solid lubrication; Friction; Friction mechanisms; Wear; PTFE; Molybdenum
OSTI Identifier:
1285954

Babuska, T. F., Pitenis, A. A., Jones, M. R., Nation, B. L., Sawyer, W. G., and Argibay, N.. Temperature-Dependent Friction and Wear Behavior of PTFE and MoS2. United States: N. p., Web. doi:10.1007/s11249-016-0702-y.
Babuska, T. F., Pitenis, A. A., Jones, M. R., Nation, B. L., Sawyer, W. G., & Argibay, N.. Temperature-Dependent Friction and Wear Behavior of PTFE and MoS2. United States. doi:10.1007/s11249-016-0702-y.
Babuska, T. F., Pitenis, A. A., Jones, M. R., Nation, B. L., Sawyer, W. G., and Argibay, N.. 2016. "Temperature-Dependent Friction and Wear Behavior of PTFE and MoS2". United States. doi:10.1007/s11249-016-0702-y. https://www.osti.gov/servlets/purl/1285954.
@article{osti_1285954,
title = {Temperature-Dependent Friction and Wear Behavior of PTFE and MoS2},
author = {Babuska, T. F. and Pitenis, A. A. and Jones, M. R. and Nation, B. L. and Sawyer, W. G. and Argibay, N.},
abstractNote = {We present an investigation of the temperature-dependent friction behavior of PTFE, MoS2, and PTFE-on- MoS2. 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 monotonic inverse temperature dependent friction behavior, as well as reported high-friction transitions and plateaus at temperatures below about -20°C that were not observed, providing new insights about the molecular mechanisms of macro-scale friction. The temperature-dependent friction behavior characteristic of self-mated PTFE was found also on the PTFE-on-MoS2 sliding contact, suggesting that PTFE friction was defined by sub-surface 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 torsional techniques measuring internal friction. Additionally, hysteresis in friction behavior suggests an increase in near-surface crystallinity at upon exceeding the high temperature relaxation, Tα~ 116°C.},
doi = {10.1007/s11249-016-0702-y},
journal = {Tribology Letters},
number = 2,
volume = 63,
place = {United States},
year = {2016},
month = {6}
}