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First International Brazil Conference on Tribology TriboBr-2010 and 2nd Internacional Tribology Symposium of IFToMM — vol. 1, num.1 (2010)

Title

TRIBOLOGY OF FLUORINATED DIAMOND-LIKE CARBON COATINGS: FIRST PRINCIPLES CALCULATIONS AND SLIDING EXPERIMENTS

TRIBOLOGY OF FLUORINATED DIAMOND-LIKE CARBON COATINGS: FIRST PRINCIPLES CALCULATIONS AND SLIDING EXPERIMENTS

Authorship

Sen, F.G.; Qi, Y.; Alpas, A.T.

Sen, F.G.
Sen, F.G.

I am this author

Qi, Y.
Qi, Y.

I am this author

Alpas, A.T.
Alpas, A.T.

I am this author

DOI

10.5151/5463-5463-17347

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Abstract

Sliding contact experiments and first principles calculations were conducted to study tribological properties between aluminum and fluorinated diamond-like carbon (F- DLC) surfaces. Sliding tests between Al and F-DLC coating generated a low coefficient of friction (COF) of 0.1-0.14 and carbonaceous transfer layers containing AlF3 were formed on the Al surfaces as determined by x-ray photoelectron spectroscopy. An interface model that examined 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 F transfer to the Al surface resulted in attainment of a low COF between Al and F-DLC.

 

Sliding contact experiments and first principles calculations were conducted to study tribological properties between aluminum and fluorinated diamond-like carbon (F- DLC) surfaces. Sliding tests between Al and F-DLC coating generated a low coefficient of friction (COF) of 0.1-0.14 and carbonaceous transfer layers containing AlF3 were formed on the Al surfaces as determined by x-ray photoelectron spectroscopy. An interface model that examined 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 F transfer to the Al surface resulted in attainment of a low COF between Al and F-DLC.

Keywords

Aluminum; Diamond-like carbon; Fluorine; First principles simulations.

Aluminum; Diamond-like carbon; Fluorine; First principles simulations.

How to refer

Sen, F.G.; Qi, Y.; Alpas, A.T.. TRIBOLOGY OF FLUORINATED DIAMOND-LIKE CARBON COATINGS: FIRST PRINCIPLES CALCULATIONS AND SLIDING EXPERIMENTS , p. 560-570. In: First International Brazil Conference on Tribology TriboBr-2010 and 2nd Internacional Tribology Symposium of IFToMM, Rio de Janeiro, 2010.
ISSN: - , DOI 10.5151/5463-5463-17347