Effect of Water Adsorption on Microtribological Properties of Hydrogenated Diamond-Like Carbon Films

Tagawa, Masatoshi; Ikemura, Masashi; Nakayama, Yoshihito; Ohmae, Nobuo

doi:10.1023/b:tril.0000044507.44022.13

Cited by 43 publications

(19 citation statements)

References 8 publications

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“…When p/p sat increases higher than 0.95, F cap decreases significantly. This is consistent with other previous model predictions [1], but not consistent with the experimental data [25][26][27][28][29][30][31][32]36,39]. In contrast, the calculation including the adsorption isotherm (Fig.…”

Section: Type-ii Adsorption Isotherm and Complete Wettingsupporting

confidence: 90%

“…But, the calculated RH dependence of the capillary force did not agree quantitatively with the experimental data. A similar RH dependence of the capillary force was experimentally observed for other materials, but the maximum capillary forces were seen at different RH regions [15,29,30]. The situation is similar in larger contact area studies [9,14,19,20,31].…”

Section: Introductionsupporting

confidence: 77%

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Effects of gas adsorption isotherm and liquid contact angle on capillary force for sphere-on-flat and cone-on-flat geometries

Hsiao

Marino

Kim

2010

Journal of Colloid and Interface Science

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Section: Type-ii Adsorption Isotherm and Complete Wettingsupporting

confidence: 90%

Section: Introductionsupporting

confidence: 77%

Effects of gas adsorption isotherm and liquid contact angle on capillary force for sphere-on-flat and cone-on-flat geometries

Hsiao

Marino

Kim

2010

Journal of Colloid and Interface Science

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“…In earlier studies byFreyman et al [16], it was shown that the hydrogenate carbon films doped with 5% sulfur have low friction coefficient (<0.01) under ambient air with relative humidity. Together with the results ofTagawa et al [17], it was shown the hydrogenated carbon films have low friction coefficient in humid air. Friction coefficient and friction endurance of films were more excellent under high vacuum than under ambient air [18].…”

Section: Introductionsupporting

confidence: 72%

Deposition and Tribological Properties of Sulfur-Doped DLC Films Deposited by PBII Method

Moolsradoo

Watanabe

2010

Advances in Materials Science and Engineering

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Sulfur-doped diamond-like carbon films (S-DLC) fabricated fromC2H2andSF6mixtures were used to study the effects of sulfur content and negative pulse bias voltage on the deposition and tribological properties of films prepared by plasma-based ion implantation (PBII). The structure and relative concentration of the films were analyzed by Raman spectroscopy and Auger electron spectroscopy. Hardness and elastic modulus of films were measured by nanoindentation hardness testing. Tribological characteristics of films were performed using a ball-on-disk friction tester. The results indicate that with the increasing sulfur content, the hardness and elastic modulus decrease. Additionally, by changing the negative pulse bias voltage from 0 kV to−5 kV, the hardness and elastic modulus increase, while the friction coefficient and specific wear rate tends to decrease. Moreover, at a negative pulse bias voltage of−5 kV and flow-rate ratio of 1 : 2, there is considerable improvement in friction coefficient of 0.05 under ambient air is due to the formation of a transfer films on the interface. The decrease in the friction coefficient of films doped with 4.9 at.% sulfur is greater under high vacuum (0.03) than under ambient air (>0.1).

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“…Hydrogen bonds between hydrogenated carbonaceous surfaces and water molecules could be involved, but one has to keep in mind that such bonds are highly oriented. Capillary forces could also be involved, as observed in microtribological experiments, which show a concomitant increase in adhesion and friction forces as a function of surface coverage by water molecules [49]. In such cases, the surface roughness and real contact area would control these capillary forces (thus friction) DLC solid lubricant coatings 1021 in a humid environment.…”

Section: Adhesionmentioning

confidence: 97%

Towards the use of diamond-like carbon solid lubricant coatings in vacuum and space environments

Fontaine

2008

Proceedings of the Institution of Mechanical Engineers, Part J:

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Owing to the increasing demand in tribological performance for vacuum-and spacerelated applications, development of new solid lubricant coatings is necessary. Diamond-like carbon (DLC) coatings have been successfully used in many conventional mechanical applications to reduce both friction and wear. The potential use of these new solid lubricants under vacuum becomes then a critical question, which this article will attempt to address. DLC deposition, structure, and properties are first introduced to the reader. The exceptional tribological behaviour of DLC coatings is also discussed, in comparison with other tribological coatings. Attention is focused on the vacuum tribology of DLC films, pointing out the very low friction and wear that may be achieved with these materials. Phenomena accounting for establishment and lifetime of such low-friction regime are proposed. Finally, some open issues concerning vacuum-and space-related applications are discussed.

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Effect of Water Adsorption on Microtribological Properties of Hydrogenated Diamond-Like Carbon Films

Cited by 43 publications

References 8 publications

Effects of gas adsorption isotherm and liquid contact angle on capillary force for sphere-on-flat and cone-on-flat geometries

Effects of gas adsorption isotherm and liquid contact angle on capillary force for sphere-on-flat and cone-on-flat geometries

Deposition and Tribological Properties of Sulfur-Doped DLC Films Deposited by PBII Method

Towards the use of diamond-like carbon solid lubricant coatings in vacuum and space environments

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