Friction control of diamond-like carbon coatings

Donnet, Christophe; Grill, A.

doi:10.1016/s0257-8972(97)00275-2

Cited by 255 publications

(118 citation statements)

References 15 publications

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“…Specifically, if it is taken into account that the mass density of H-DLC oscillates from 1.9-3.0 g/cm 3 [46], it can then be considered a density of 2.5 g/cm 3 (0.4 x 10 -3 m 3 /kg) for the actual coating. In the process, the transition temperature can be decreased to 300 -325 °C, for contact stresses ranging from 0.1 -0.2 GPa, i.e., when the applied normal loads vary between 10 and 50 N. In order to determine if the surface temperature of the two sliding bodies in contact is sufficiently high as to reach the graphitisation temperature, the following flash temperature relationship [11] can be used to estimate an approximate of the induced temperature rise due to the frictional heat at the contact area.…”

Section: Phase Transition Analysismentioning

confidence: 99%

Tribological performance of an H-DLC coating prepared by PECVD

Solís

Zhao

Wang

et al. 2016

Applied Surface Science

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and 5.5 x 10 -8 mm -3 /N m, respectively. Through Raman spectroscopy and electron microscopy it was confirmed the carbon-carbon contact, due to the tribolayer formation on the wear scars of the coating and pin. In order to further corroborate the experimental observations regarding the graphitisation behaviour, the existing mathematical relationships to determine the graphitisation temperature of the coating/steel contact as well as the flash temperature were used.

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Section: Phase Transition Analysismentioning

confidence: 99%

Tribological performance of an H-DLC coating prepared by PECVD

Solís

Zhao

Wang

et al. 2016

Applied Surface Science

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“…The friction of these films in a dry nitrogen atmosphere has been shown to decrease with increasing amounts of hydrogen the film, and a friction coefficient as low as 0.003 was reported. Donnet et al grew carbon films that contained hydrogen by a similar deposition technique [10] and concluded that the films needed to contain at least 40% hydrogen to give ultralow friction in vacuum.…”

Section: Introductionmentioning

confidence: 99%

Frictional behavior of diamondlike carbon films in vacuum and under varying water vapor pressure

Andersson¹,

Erck

Erdemir

2003

Surface and Coatings Technology

188

105

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In this study, we investigated the frictional behavior of both hydrogenated and hydrogen-free diamondlike carbon (DLC) films in high vacuum (10 -6 Pa) at room temperature. Water was also introduced into the vacuum chamber to elucidate its effects on DLC film tribology. The hydrogen-free DLC (also referred to as tetrahedral amorphous carbon, or ta-C) was produced by an arc-PVD process, and the highly hydrogenated DLC was produced by plasma-enhanced chemical-vapor deposition.Tribological measurements of these films were made with a pin-on-disc machine with coated steel balls and coated steel discs in matched pairs under a 1 N load. The ball/disk pairs were rotated at sliding speeds in the range of 0.025-0.075 m/s. In vacuum, the steady-state friction coefficient of ta-C was of the order of 0.6 and the wear was severe, whereas for the highly hydrogenated film, friction was below 0.01, and in an optical microscope no wear could be detected. Adding water vapor to the sliding ta-C system in a vacuum chamber caused friction to decrease monotonically from 0.6 to ≈0.05. In contrast, adding water vapor to the sliding DLC system caused the friction to increase linearly with pressure from 0.01 to 0.07. The results illustrate the importance of taking into account environmental conditions, especially the presence of water, when DLC films are being considered for a given application.

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“…This is mainly due to the fact that the microstructure and chemistry of these films may vary substantiality depending on the deposition conditions and source gases used, In general, it has been found that the tribological properties of these films are very sensitive to test conditions (such as environment, sliding speed, temperature, etc.) [13][14][15][16][17][18][19]. The presence of some dopants (e. g., silicon] in the structures of DLC films appears to make these films less sensitive to humidity [13].…”

Section: Introductionmentioning

confidence: 99%