Tribology of fluorinated diamond‐like carbon coatings: first principles calculations and sliding experiments. (26th January 2012)

• Record Type: Journal Article
• Authors: Sen, F. G.; Qi, Y.; Alpas, A. T.; Souza, Roberto M.; de, Daniel
• Is Part Of: Lubrication science. Volume 25:Number 2(2013:Mar.)
• Page Start: 111
• Page End: 121
• Publication Date: 2012-01-26
• Subjects: Tribology -- Periodicals; Lubrication systems -- Research -- Periodicals; Surfaces (Technology) -- Research -- Periodicals; 621.89
• DOI: 10.1002/ls.1166
• Languages: English
• ISSNs: 0954-0075

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Sliding contact experiments and first principles calculations were conducted to study tribological properties of aluminium and fluorinated diamond‐like carbon (F‐DLC) surfaces. Sliding tests between Al and an F‐DLC coating generated a low coefficient of friction (COF) of 0.09–0.14 and led to the formation of carbonaceous transfer layers containing AlF₃ on the Al surfaces as determined by X‐ray photoelectron spectroscopy. An interface model that examined the interactions between Al (111) and F‐terminated diamond (111) surfaces revealed that F atoms would transfer to the Al surface in increasing quantities with an increase in the contact pressure and the F transfer would lead to the formation of a stable AlF₃ compound at the Al surface. The generation of repulsive forces between two F‐passivated surfaces as a result of the F transfer to the Al surface was shown to be responsible for the low COF between Al and F‐DLC. Copyright © 2012 John Wiley &amp; Sons, Ltd.</p> </abstract>