Fundamentals of the Tribology of DLC Coatings

Fontaine, Julien; Donnet, Christophe; Erdemir, Ali

doi:10.1007/978-0-387-49891-1_5

Cited by 60 publications

(73 citation statements)

References 2 publications

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“…21 Most DLC films are harder than most metallic materials, and DLC coating by the PBIID gives hardness values ranging from 6 GPa to 20 GPa depending on the deposition conditions. 19,20 In this study, the hardness values of the DLC layer on the stainless steel (17.6 GPa) and nickel-titanium wires (9.1 GPa) were determined by the nanoindentation test and were significantly higher than the hardness values of the surface layers on the as-received stainless steel (11.6 GPa) and nickel-titanium wires (4.7 GPa). This study clearly demonstrated that the DLC-coating process reduces frictional force.…”

Section: Discussionmentioning

confidence: 79%

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Effects of a diamond-like carbon coating on the frictional properties of orthodontic wires

Muguruma¹,

Iijima²,

Brantley³

et al. 2011

The Angle Orthodontist

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Objective: To test the hypothesis that a diamond-like carbon coating does not affect the frictional properties of orthodontic wires. Materials and Methods: Two types of wires (nickel-titanium and stainless steel) were used, and diamond-like carbon (DLC) films were deposited on the wires. Three types of brackets, a conventional stainless steel bracket and two self-ligating brackets, were used for measuring static friction. DLC layers were observed by three-dimensional scanning electron microscopy (3D-SEM), and the surface roughness was measured. Hardness and elastic modulus were obtained by nanoindentation testing. Frictional forces and surface roughness were compared by the KruskalWallis and Mann-Whitney U-tests. The hardness and elastic modulus of the wires were compared using Student's t-test. Results: When angulation was increased, the DLC-coated wires showed significantly less frictional force than the as-received wires, except for some wire/bracket combinations. Thin DLC layers were observed on the wire surfaces by SEM. As-received and DLC-coated wires had similar surface morphologies, and the DLC-coating process did not affect the surface roughness. The hardness of the surface layer of the DLC-coated wires was much higher than for the as-received wires. The elastic modulus of the surface layer of the DLC-coated stainless steel wire was less than that of the as-received stainless steel wire, whereas similar values were found for the nickeltitanium wires. Conclusions: The hypothesis is rejected. A DLC-coating process does reduce the frictional force. (Angle Orthod. 2011;81:141-148.)

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Section: Discussionmentioning

confidence: 79%

“…19,20 Hardness is often the most noted property of DLC coatings. It can be challenging to determine the true mechanical properties of a material that exists only as a thin coating less than a few micrometers thick.…”

Section: Discussionmentioning

confidence: 99%

Effects of a diamond-like carbon coating on the frictional properties of orthodontic wires

Muguruma¹,

Iijima²,

Brantley³

et al. 2011

The Angle Orthodontist

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show abstract

“…Additionally, the coefficient of friction is sensitive to the environment that the DLC coating slides in the counterface and the interfacial chemistry. Fontaine et al [19] considers friction of DLC coatings to be a summation of adhesive, abrasive, and shear mechanisms. The magnitude of adhesive friction in a DLC coating is related to the coating microstructure, the environmental conditions, and the counterface.…”

Section: Contributions To Frictionmentioning

confidence: 99%

“…The tribochemical interactions that control the friction of hydrogenated coatings against a steel counterface were examined by Fontaine et al [19,32] by varying the partial pressure of hydrogen in a vacuum. The coefficient of friction was shown to be initially low (in the range 0.001-0.005) independent of the hydrogen partial pressure, but it increased suddenly to a coefficient of friction of 0.3 after some time.…”

Section: The Effects Of Hydrogenmentioning

confidence: 99%

The friction of diamond-like carbon coatings in a water environment

et al. 2013

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Diamond-like carbon (DLC) coatings are known to provide beneficial mechanical and tribological properties in harsh environments. Their combination of high wear resistance and low friction has led to their extensive use in any number of industries. The tribological performance of a DLC coating is varied however, and the frictional response is known to be strongly dependent on the surrounding environment, as well as the material composition and bonding structure of the DLC coating. This paper presents an up-to-date review on the friction of DLC coatings in a water environment, with a special focus on transfer layer formation and tribochemistry.

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“…These exceptional tribological abilities explain the increasing success of Diamond-Like Carbon coatings over the years, both in industrial applications and in the laboratory. The exceptional tribological behavior of Diamond-Like Carbon films appears to be due to a unique combination of surface chemical, physical, and mechanical interactions at their sliding interfaces [65].…”

Section: Diamond-like Carbon Coatingsmentioning

confidence: 99%