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Donnet, Christophe; Fontaine, Julien; Grill, A.; Mogne, Thierry Le

doi:10.1023/a:1018800719806

Cited by 175 publications

(66 citation statements)

References 3 publications

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“…The super low friction property was obtained when sliding a DLC surface (a-C:H) containing a large amount of hydrogen (more than 40 atomic %) on steel (or the same DLC material) in an ultrahigh vacuum or in a dry inert gas atmosphere [11,12]. Previous results indicated that hydrogen plays a dominant role in the friction behavior of a-C:H films [13,14]. Here the formation of a transfer film on the steel counterface seems a necessary condition [15].…”

Section: Superlubricity Of Mos 2 and Dlcmentioning

confidence: 99%

“…Here the formation of a transfer film on the steel counterface seems a necessary condition [15]. The resulting topcoats were suggested to interact through weak van der Waals forces and repulsive electrostatic forces due to positively charged H-terminated carbon atoms [14]. It is plausible that friction between H-terminated carbon surfaces would be low because the C-H/C-H interface has a low binding energy of 0.08 eV per bond.…”

Section: Superlubricity Of Mos 2 and Dlcmentioning

confidence: 99%

“…It is plausible that friction between H-terminated carbon surfaces would be low because the C-H/C-H interface has a low binding energy of 0.08 eV per bond. According to the model in equation (3), the shear strength of 10 MPa expected for such a system would lead to a steady-state friction coefficient lower than 0.01 [14].…”

Section: Superlubricity Of Mos 2 and Dlcmentioning

confidence: 99%

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Superlubricity mechanism of diamond-like carbon with glycerol. Coupling of experimental and simulation studies

Bouchet

Matta

Le-Mogne

et al. 2007

J. Phys.: Conf. Ser.

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Abstract. We report a unique tribological system that produces superlubricity under boundary lubrication conditions with extremely little wear. This system is a thin coating of hydrogen-free amorphous Diamond-Like-Carbon (denoted as ta-C) at 353 K in a ta-C/ta-C friction pair lubricated with pure glycerol. To understand the mechanism of friction vanishing we performed ToF-SIMS experiments using deuterated glycerol and 13 C glycerol. This was complemented by first-principlesbased computer simulations using the ReaxFF reactive force field to create an atomistic model of ta-C. These simulations show that DLC with the experimental density of 3.24 g/cc leads to an atomistic structure consisting of a 3D percolating network of tetrahedral (sp 3 ) carbons accounting for 71.5% of the total, in excellent agreement with the 70% deduced from our Auger spectroscopy and XANES experiments. The simulations show that the remaining carbons (with sp 2 and sp 1 character) attach in short chains of length 1 to 7. In sliding simulations including glycerol molecules, the surface atoms react readily to form a very smooth carbon surface containing OH-terminated groups. This agrees with our SIMS experiments. The simulations find that the OH atoms are mostly bound to surface sp 1 atoms leading to very flexible elastic response to sliding. Both simulations and experiments suggest that the origin of the superlubricity arises from the formation of this OH-terminated surface.

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Section: Superlubricity Of Mos 2 and Dlcmentioning

confidence: 99%

Section: Superlubricity Of Mos 2 and Dlcmentioning

confidence: 99%

Section: Superlubricity Of Mos 2 and Dlcmentioning

confidence: 99%

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Superlubricity mechanism of diamond-like carbon with glycerol. Coupling of experimental and simulation studies

Bouchet

Matta

Le-Mogne

et al. 2007

J. Phys.: Conf. Ser.

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“…A diamond-like carbon (DLC) film is an amorphous carbon film composed of sp 2 and sp 3 bonds 1 . It exhibits excellent material properties, such as high mechanical hardness, wear resistance, low friction coefficient and high chemical inertness 2 .…”

Section: Introductionmentioning

confidence: 99%

Improvement of adhesion of hydrogen-free DLC film by employing an interlayer of tungsten carbide

Isono

Tanimoto

Iijima³

et al. 2018

AIP Conference Proceedings

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Abstract. Materials with poor adhesion present a problem for the application of diamond-like carbon (DLC) films. As a method for solving this problem, there is a technique that deposits an interlayer of metal between the DLC film and substrate. A tungsten carbide film (W-C film) is used as the interlayer. In this study, the effect of introducing the W-C interlayer on the adhesion of the DLC film was investigated. The W-C films were deposited using two types of cemented tungsten carbides (WCs) as the cathode, one containing Co (WC-Co) and the other containing Ti (WC-Ti), as a binder for forming the cathode shape. It is necessary to control the film thickness of the interlayer to introduce the interlayer to the DLC film. The film thickness control of W-C films became possible by using a discharge counter. DLC films were deposited using a bias voltage of -100 V. The film thicknesses of the W-C interlayer and DLC film at the time of investigating adhesion were 30 nm and 300 nm, respectively. The result of the tape-peeling test showed that the adhesion of the DLC film was improved by employing the W-C interlayer. In addition, adhesion was further improved by removing the oxide layer on the intermediate layer.

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“…Specifically, with the use of such advanced tools as scanning tunneling and atomic force microscopy (STM and AFM), measurement of superlow friction, and hence the observation of superlubricity on incommensurate sliding systems became feasible [3][4][5]. Since then, the interest in superlubricity research has grown considerably, and during the last decade or so, this effort has shifted towards the development of novel engineering materials and coatings, such as diamond-like carbon (DLC), that can provide superlubricity under industrially relevant sliding conditions of various mechanical systems [6,7].…”

Section: Introductionmentioning

confidence: 99%

An Overview of Superlubricity in Diamond-like Carbon Films

Erdemir

Fontaine

Donnet

Tribology of Diamond-Like Carbon Films

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Diamond-like carbon (DLC) films have emerged as a class of very important tribological materials in recent years mainly because of their outstanding properties, such as high mechanical strength and hardness, excellent chemical inertness, and exceptional friction and wear performance under both dry and lubricated sliding conditions. Persistent and systematic research efforts during the last decade have resulted in the development of a new breed of DLC films providing superlubricity and near-wearless sliding even under very harsh contact and environmental conditions. In fact, the dry sliding friction and wear coefficients (i.e., as low as 0.001 and 10 −11 mm 3 /N.m, respectively) of these films are among the lowest reported to date, and such unusual tribological properties may have huge positive impacts on efficiency, durability, and performance characteristics of a wide range of mechanical systems, including magnetic hard disks, sliding and/or rolling contact bearings, gears, mechanical seals, scratch-resistant glasses, invasive and implantable medical devices, microelectromechanical systems (MEMS) and many more. In this chapter, we attempt to provide an up-to-date overview of these novel DLC films that can provide superlubricity and discuss in detail those factors that control their very unique lubrication mechanisms. Specifically, we concentrate on the state of the art in our understanding of their superlow friction and wear mechanisms, and how these mechanisms may relate to their structural chemistry, mechanical properties, and test and environmental conditions. In particular, various intrinsic (film-specific) and extrinsic (or test condition-specific) factors that play major roles in friction and wear of DLC films are discussed in detail and correlated with their friction and wear mechanisms.

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Cited by 175 publications

References 3 publications

Superlubricity mechanism of diamond-like carbon with glycerol. Coupling of experimental and simulation studies

Superlubricity mechanism of diamond-like carbon with glycerol. Coupling of experimental and simulation studies

Improvement of adhesion of hydrogen-free DLC film by employing an interlayer of tungsten carbide

An Overview of Superlubricity in Diamond-like Carbon Films

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