Solid lubricants used in aerospace applications must provide low friction and a predictable operation life over an extreme range of temperatures, environments and contact conditions. PTFE (polytetrafluoroethylene) and PTFE composites have shown favourable tribological performance as solid lubricants. This study evaluates the effect of temperature on the friction coefficient of neat PTFE, a PTFE/ PEEK (polyetheretherketone) composite and an expanded PTFE (ePTFE)/epoxy coating. These experiments evaluate friction coefficient over a temperature span which, to the investigators' knowledge, has not been previously examined. Results show a monotonic increase in friction coefficient as sample surface temperature was decreased from 317 K to 173 K for all three samples. The factional performance of these and other published solid lubricant polymers was modelled using an adjusted Arrhenius equation, which correlates the coefficient of friction of the polymer materials to their viscoelastic behaviour. A model fit of all the polymer data from 173 K to 450 K gives an activation energy of 3.7 kJ/mol. This value suggests that breaking of van der Waals bonds is the likely mechanism responsible for the frictional behavioUr over this temperature range.
Cryogenic friction behavior of PTFE based solid lubricant composites
Tribology Letters ; 20 , 2 ; 109-113
2005
5 Seiten, 2 Bilder, 2 Tabellen, 22 Quellen
Article (Journal)
English
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