The effect of hydrogen on the tribological behavior of diamond like carbon (DLC) coatings sliding against Al 2 O 3 in water environment

Zhang, T.F.; Xie, Dong; Huang, Nan; Leng, Y.X.

doi:10.1016/j.surfcoat.2016.10.045

Cited by 27 publications

(12 citation statements)

References 28 publications

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“…The CoF in the absence of liquid remains at CoF(0.1), whereas when water-based liquid or bovine calf serum fluid is present, several differences arise. On average the coefficient of friction in the presence of water based testing fluid is lower and more stable than in humid air at 50% relative humidity, RH, which can be attributed to water induced lubrication regime [36][37][38]. In addition, the removal of wear debris in a fluid can contribute to a smaller CoF; the diluting effect exerted by the fluid decreases entrapped wears debris which can abrade the contact area.…”

Section: Selection Of the Body-like Fluid Mediamentioning

confidence: 99%

Corrosion fatigue in DLC-coated articulating implants: an accelerated methodology to predict realistic interface lifetime

Pardo

Ilic

Thorwarth

et al. 2019

Science and Technology of Advanced Materials

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We present a methodology to accelerate and estimate the lifetime of an interlayer under dynamic loading in body-like media. It is based on accelerating corrosion fatigue processes taking place at the buried interface of a Si-based adhesion-promoting interlayer in articulating implants on a CoCrMo biomedical alloy; the implants are coated with diamond-like carbon (DLC). The number of interface loading cycles to delamination is determined by reciprocal loading in corrosive fluid. Its dependence on the load is summarized in a Wöhler-like curve of a DLC/DLC-Si/CoCrMo system in body working conditions: cyclic stresses at 37°C in phosphate buffered saline (PBS). The presence of oxygen as a contaminant strongly affects the lifetime of the interface under corrosion fatigue. The main parameters acting on the prediction, with a special emphasis on simulated in vivo conditions, are analyzed and discussed: the media (PBS, Milli-Q water, NaCl, Ringers' solution and bovine calf serum), the load, the frequency and the composition of the interface determined by X-ray photoelectron spectroscopy.

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Section: Selection Of the Body-like Fluid Mediamentioning

confidence: 99%

Corrosion fatigue in DLC-coated articulating implants: an accelerated methodology to predict realistic interface lifetime

Pardo

Ilic

Thorwarth

et al. 2019

Science and Technology of Advanced Materials

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“…Additionally, the hydrogen content of the DLC layers might be important under the wet condition. Water molecules might react with a hydrogenated DLC coating to form oxygen-containing hydrophilic groups on the surface that could provide lubrication for the sliding counter surface [21,22]. Another possibility is that hydrogen-terminated surfaces of a hydrogenated DLC coating may interact through weak van der Waals forces [16,22].…”

Section: Discussionmentioning

confidence: 99%

“…Other studies have investigated the effect of DLC coatings on the friction of orthodontic wires and found that DLC-coated wires produced less frictional resistance than non-coated wires [9][10][11][12][18][19][20]. The properties of a DLC coating depend on the hydrogen content, sp 2 /sp 3 ratio and presence of doping elements [21,22]. The properties of DLC-coated orthodontic materials are not well understood, and limited information is available regarding the hydrogen content and sp 2 /sp 3 ratio of DLC-deposited surfaces.…”

Section: Introductionmentioning

confidence: 99%

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

et al. 2018

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Abstract:This study investigated a diamond-like carbon (DLC) coating formed on stainless steels (disk and wire specimens) using a plasma-based ion implantation/deposition method with two different parameters (DLC-1, DLC-2). These specimens were characterized using high-resolution elastic recoil analysis, microscale X-ray photoelectron spectroscopy and nanoindentation testing to determine the hydrogen content, sp 2 /sp 3 ratio and mechanical properties of the coating. Three-point bending and frictional properties were estimated. DLC-1 had a diamond-rich structure at the external surface and a graphite-rich structure at the inner surface, while DLC-2 had a graphite-rich structure at the external surface and a diamond-rich structure at the inner surface. Mean mechanical property values obtained for the external surface were lower than those for the inner surface in both types of DLC-coated specimens. The hydrogen content of DLC-2 was slightly higher versus DLC-1. Both DLC-coated wires produced a significantly higher elastic modulus according to the three-point bending test versus the non-coated wire. DLC-2 produced significantly lower frictional force than the non-coated specimen in the drawing-friction test. The coating of DLC-1 was partially ruptured by the three-point bending and drawing-friction tests. In conclusion, the bending and frictional performance of DLC-coated wire were influenced by the hydrogen content and sp 2 /sp 3 ratio of the coating.

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“…Hydrogenated amorphous carbon (a-C:H) films are well known to exhibit a low friction coefficient and high wear resistance, − whereas their friction characteristics vary depending on the microstructure of the amorphous carbon network and the hydrogen content in the film. − For example, the friction coefficient of a-C:H in ambient air varies in the range of 0.02–0.5 . The wide range of friction coefficient results from the wide variety of microstructures of a-C:H films, as well as the relative humidity (RH) in the friction environment, which makes finding and applying suitable a-C:H films in various industrial applications difficult. − Therefore, classifying the a-C:H films is important to find the most suitable friction properties in various industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Adsorption on the Frictional Properties of Hydrogenated Amorphous Carbon Films in Various Relative Humidities

Ishikawa

Choi

2021

Langmuir

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The tribological properties of hydrogenated amorphous carbon (a-C:H) films in ambient air were investigated from the microstructural point of view. a-C:H films with various microstructures (polymer-like, diamond-like, and graphite-like structures) were prepared, and the thickness of water adsorption layers on the films was measured. The adsorption behavior of water molecules on a-C:H films could be expressed with the Brunauer–Emmett–Teller (BET) isotherm, while the thicknesses of icelike and liquidlike water layers adsorbed on the films could be determined using the BET parameters C and n m a. The polymer-like films exhibited the thickest icelike and liquidlike water adsorption layers, which decreased as the film structure changed to a diamond-like or a graphite-like structure. A strong relationship was observed between the thickness of water adsorption layers and the surface oxidation of the a-C:H films. The friction coefficient of the films in ambient air can be well explained by the surface oxidation and the thickness of water adsorption layers. Polymer-like films showed high friction coefficients due to the formation of a thick water layer on the films originated from the high surface oxidation of the film surface, whereas the graphite-like film exhibited a low friction coefficient due to low oxidation and a thin water adsorption layer. Furthermore, friction tests between the a-C:H films with different microstructures under ambient air were performed to determine the lowest friction pair in various relative humidities (RHs).

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The effect of hydrogen on the tribological behavior of diamond like carbon (DLC) coatings sliding against Al 2 O 3 in water environment

Cited by 27 publications

References 28 publications

Corrosion fatigue in DLC-coated articulating implants: an accelerated methodology to predict realistic interface lifetime

Corrosion fatigue in DLC-coated articulating implants: an accelerated methodology to predict realistic interface lifetime

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

Effect of Water Adsorption on the Frictional Properties of Hydrogenated Amorphous Carbon Films in Various Relative Humidities

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