Diamond-like carbon-based functionally gradient coatings for space tribology

Donnet, Christophe; Fontaine, Julien; Mogne, Thierry Le; Belin, M.; Héau, Christophe; Terrat, J.P.; Vaux, F.; Pont, G.

doi:10.1016/s0257-8972(99)00432-6

Cited by 133 publications

(57 citation statements)

References 12 publications

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“…In 2000, Chhowalla and Amaratunga [10] reported similar ultralow friction and wear performance for a fullerene-like MoS 2 nanoparticle material. It was later discovered by several authors independently that some hydrogenated diamond-like carbon (DLC) coatings exhibit the same super low state with a friction coefficient lying in the millirange [11]. 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].…”

Section: Superlubricity Of Mos 2 and Dlcmentioning

confidence: 99%

“…It was later discovered by several authors independently that some hydrogenated diamond-like carbon (DLC) coatings exhibit the same super low state with a friction coefficient lying in the millirange [11]. 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].…”

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%

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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“…[1][2][3] Various synthesis methods have been studied for fabricating carbon films to date, such as ion beam assisted deposition (IBAD), 4) laser deposition 5) and plasma enhanced chemical vapor deposition (PECVD). 6) However, since the mechanical properties of the films are different from that of the substrate, hard layers of diamondlike materials deposited directly on the metallic substrate result in a high residual stress at the fracture.…”

Section: Introductionmentioning

confidence: 99%

DLC Film Fabricated by a Composite Technique of Unbalanced Magnetron Sputtering and PIII

Chen

Cai

et al. 2002

Mater. Trans.

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DLC multilayer films were deposited on an AISI 304 stainless steel substrate by the composite technique of unbalanced magnetron sputtering and plasma immersion ion implantation (PIII). Structure characterization was performed on the films by Raman spectroscopy (RS) and Glancing X-ray Diffraction (GXRD). Composition analysis of the surface layer on the implanted substrates was carried out using auger electron spectroscopy (AES). The mechanical properties of the films were evaluated by nanoindentation. The results showed that the Raman spectra were divided into a "D" disordered peak and a "G" graphite peak with the integrated intensity ratio between them (I D /I G ) being 1.30. The implanted carbon penetrated the substrate resulting in complete interfacial mixing. The hardness, elastic modulus, fracture toughness and interfacial fracture toughness of the films were about 19.84 GPa, 190.03 GPa, 3.75 MPa·m 1/2 and 5.68 MPa·m 1/2 respectively. Compared with that of a DLC coating deposited directly by the PIII technique, the interfacial fracture toughness of the multilayer films increased, which is mainly attributed to the interfacial mixing at the interface.

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“…Superlubricious situations were predicted and observed only in ultrahigh vacuum ͑or inert gas͒ since 1993 by different authors. 7,[11][12][13] Concerning lubrication by polyhydric alcohols and particularly glycerol C 3 H 8 O 3 , selective transfer was the name given in the 1970s to various phenomena involving copperbased materials and ferrous surfaces as friction pairs. It was widely reported to produce extremely low friction in the technical literature of the former USSR.…”

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confidence: 99%

Superlubricity and tribochemistry of polyhydric alcohols

et al. 2008

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The anomalous low friction of diamondlike carbon coated surfaces lubricated by pure glycerol was observed at 80°C. Steel surfaces were coated with an ultrahard 1 µm thick hydrogen-free tetrahedral coordinated carbon ͑ta-C͒ layer produced by physical vapor deposition. In the presence of glycerol, the friction coefficient is below 0.01 at steady state, corresponding to the so-called superlubricity regime ͑when sliding is then approaching pure rolling͒. This new mechanism of superlow friction is attributed to easy glide on triboformed OHterminated surfaces. In addition to the formation of OH-terminated surfaces but at a lower temperature, we show here some evidence, by coupling experimental and computer simulations, that superlow friction of polyhydric alcohols could also be associated with triboinduced degradation of glycerol, producing a nanometer-thick film containing organic acids and water. Second, we show outstanding superlubricity of steel surfaces directly lubricated by a solution of myo-inositol ͑also called vitamin Bh͒ in glycerol at ambient temperature ͑25°C͒. For the first time, under boundary lubrication at high contact pressure, friction of steel is below 0.01 in the absence of any long chain polar molecules. The mechanism is still unknown but could be associated with friction-induced dissociation of glycerol and interaction of waterlike species with steel surface.

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Diamond-like carbon-based functionally gradient coatings for space tribology

Cited by 133 publications

References 12 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

DLC Film Fabricated by a Composite Technique of Unbalanced Magnetron Sputtering and PIII

Superlubricity and tribochemistry of polyhydric alcohols

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