Publication: Tribology of fluorinated diamond-like carbon coatings: first principles calculations and sliding experiments

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Title	Tribology of fluorinated diamond-like carbon coatings: first principles calculations and sliding experiments
Authors/Editors*	F.G. Sen, Y. Qi, A.T. Alpas
Where published*	Lubrication Science
How published*	Journal
Year*	2013
Volume	25
Number
Pages	111-121
Publisher
Keywords
Link	http://onlinelibrary.wiley.com/doi/10.1002/ls.1166/abstract
Abstract	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 0.09â0.14 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.