Tribochemistry of diamond-like carbon coatings in various environments

Donnet, Christophe; Belin, M.; Auge, J.; Martin, Jean Michel; Grill, A.; Patel, V.

doi:10.1016/0257-8972(94)90228-3

Cited by 187 publications

(104 citation statements)

References 18 publications

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“…The superlubricity of a-C:H coatings under ultrahigh vacuum is observed and has previously been reported by several research groups, including some of us. 21 Although ta-C was little studied in details in the literature, we obtained amazing friction results approaching superlubricity for the ta-C/ta-C combination under boundary lubrication conditions with pure glycerol at 80°C. As shown in Fig.…”

Section: Resultsmentioning

confidence: 86%

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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Section: Resultsmentioning

confidence: 86%

Superlubricity and tribochemistry of polyhydric alcohols

et al. 2008

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“…The presence of some appears to make these films less sensitive to humidity [13]. The performance of hydrogen-free DLC films is better in moist air, but hydrogenated DLCs provide much Iower friction and wear in dry and inert test environments [18][19][20][21][22][23]. For most DLC films, exposure to high temperatures may cause irreversible chemical and structural changes that can, in turn, lead to high friction and wear [17,24].…”

Section: Introductionmentioning

confidence: 99%

Friction and wear performance of diamond-like carbon films grown in various source gas plasmas

Erdemir

Nilufer

Eryilmaz

et al. 1999

Surface and Coatings Technology

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“…Erdemir et al (32,33) have found that the friction coefficient on a-C:H from methane having the lowest µ, being the opposite of a-C:H films from acetylene which presents the largest µ.The large spread of values can be understood in terms of deposition system. In general, low values of these coefficients can be attributed to low shear strength of the transfer layer (34) . It is a consistent explanation with Raman analysis, which the layer has a disordered graphite structure, revealing evidence of amorphization of a-C:H films in the wear track.…”

Section: Friction Coefficientmentioning

confidence: 99%

Study of a-C:H thin films grown by PIII in different times for Mechanical and Tribological applications

SantAna¹,

Santos²,

Silva³

et al. 2017

RBAV

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A Steel alloy (16MnCr5) used for automotive applications (engine components) was chosen as substrate to be covered by DLC films deposited by Plasma Immersion Ion Implantation. This kind of recovery is useful for improve its mechanical and tribological applications, more specific to increase surface hardness and to reduce the friction coefficient (µ). After polished and ultrasonicated, 16MnCr5 substrates were submitted to PIIID procedures for 100 W of radiofrequency power, from atmospheres supplied with 80% of methane and 20% of argon, keeping the work pressure fixed to 5.5 Pascal. Four different deposition times was chosen being of (1800 s, 3600 s, 5400 s and 7200 s). PIII parameters were (-3600 V, 30 µs and 300 Hz). It was investigated the effect of DLC properties over the substrates using Raman Spectroscopy (for Hydrogen content and microstructure analysis), Ultra Micro-Tribometer (for friction coefficient: µ) and Nanoindentation (hardness).

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Tribochemistry of diamond-like carbon coatings in various environments

Cited by 187 publications

References 18 publications

Superlubricity and tribochemistry of polyhydric alcohols

Superlubricity and tribochemistry of polyhydric alcohols

Friction and wear performance of diamond-like carbon films grown in various source gas plasmas

Study of a-C:H thin films grown by PIII in different times for Mechanical and Tribological applications

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