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Neutron reflectometry of boundary films on DLC coatings [Elektronski vir]
Simič, Rok ; Kalin, Mitjan ; Hirayama, Tomoko
Adsorption is one of the key phenomena involved in the boundary lubrication since it determines the formation and resistance of the boundary films. We used neutron reflectometry to study the ...adsorption ability of alcohols and fatty acids from PAO oil solution onto several DLC coatings (a-C, a-C:H, a-C:H:F and a-C:H:Si). We determined the thickness and the density of the adsorbed layers to reveal how the coating composition and doping elements affect the adsorption ability. The non-hydrogenated a-C coating proved to be the most inclined to adsorption, which is assumed to originate from the lack of hydrogen, which is a well known surface passivation source. On the other hand, no adsorption layers were detected on the F-doped DLC coating, which revealed the non-reactivity of the coating. To study the resistance of the adsorbed films, the surfaces with the adsorbed molecules were cleaned ultrasonically in heptane and analyzed by ToF-SIMS and XPS. We proved that the ultrasonic cleaning - irrespective of its duration - does not affect the amount of adsorbed molecules with respect to rinsing, which reveals the good resistivity of the adsorbed molecules to external influences. The obtained results show that the adsorption on DLC is possible and presents a potential boundary lubrication mechanism for DLC coatings despite their general non-reactivity.
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