Título

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

Autoria

SEN, F.G.; QI, Y.; ALPAS, A.T.

SEN, F.G.

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QI, Y.

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ALPAS, A.T.

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DOI

10.5151/5463-5463-17347

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Resumo

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.

Palavras-chave

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

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