Improved mixed and boundary lubrication with glycerol-diamond technology

Matta, C.; Le-Mogne, T.; Martin, Jean Michel; Sagawa, Takumaru; Okuda, Sachiko; Kano, Makoto

doi:10.1179/175158407x181507

Cited by 21 publications

(14 citation statements)

References 10 publications

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“…The percentage of sp 3 sites in our ta-C coating is thus estimated to 70%. This result is consistent with the high value for hardness (~ 65 GPa) and Young's modulus (650 GPa) we measured by nano-indentation and reported elsewhere [21]. In addition, our DSIMS profiling experiments detected no hydrogen in the bulk of the ta-C coating [21].…”

Section: Friction Of Steel/dlc In Presence Of Glycerol Mono-oleate (Gmo)supporting

confidence: 80%

“…We describe below computer simulations for ta-C finding that 71.5% of the carbon atoms have tetrahedral (sp 3 ) hybridization and connect to form a percolating 3D interconnected framework. This is corroborated by our XANES experiments [20] and XAES [21] results. Indeed, the XAES spectrum of ta-C coating in the derivative mode shows a fine structure that is assigned to KVV transitions involving π electrons as shown in figure 2.…”

Section: Friction Of Steel/dlc In Presence Of Glycerol Mono-oleate (Gmo)supporting

confidence: 79%

“…This result is consistent with the high value for hardness (~ 65 GPa) and Young's modulus (650 GPa) we measured by nano-indentation and reported elsewhere [21]. In addition, our DSIMS profiling experiments detected no hydrogen in the bulk of the ta-C coating [21]. A chromium-based interlayer used to improve the adhesion of the ta-C coating to the steel substrate was also detected.…”

Section: Friction Of Steel/dlc In Presence Of Glycerol Mono-oleate (Gmo)supporting

confidence: 79%

“…The friction results obtained with these specific products on ta-C material are very similar to those obtained with standard glycerol [21]. SSIMS spectra were recorded inside and outside the tribofilm area to clarify the material change on the ta-C surface after the super low friction tests.…”

Section: Superlubricity Mechanism As Studied By Tof-simsmentioning

confidence: 60%

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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: Friction Of Steel/dlc In Presence Of Glycerol Mono-oleate (Gmo)supporting

confidence: 80%

Section: Friction Of Steel/dlc In Presence Of Glycerol Mono-oleate (Gmo)supporting

confidence: 79%

Section: Friction Of Steel/dlc In Presence Of Glycerol Mono-oleate (Gmo)supporting

confidence: 79%

Section: Superlubricity Mechanism As Studied By Tof-simsmentioning

confidence: 60%

See 2 more Smart Citations

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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show abstract

“…DLC coatings have been reported to be chemically inert using a steel pin sliding against DLC-coated disks lubricated in oil containing MoDTC and/or ZDDP [10]. In contrast, molybdenum-based friction modifiers and ZDDP antiwear have been reported to form low friction MoS 2 sheets and/or ZDDP-derived compounds respectively, on the DLC coating providing low friction and better wear performance under boundary lubrication conditions [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The effect of MoDTC-type friction modifier on the wear performance of a hydrogenated DLC coating

Kosarieh¹,

Morina²,

Lainé³

et al. 2013

Wear

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Abstract:The application of Diamond-Like Carbon (DLC) coatings for automotive components is becoming a promising strategy to cope with the new challenges faced by automotive industries. DLC coatings simultaneously provide low friction and excellent wear resistance which could potentially improve fuel economy and durability of the engine components in contact.The mechanisms by which a non-ferrous material interacts with a variety of lubricant additives is becoming better understood as the research effort in this area increases however there are still significant gaps in the understanding .A better understanding of DLC wear may lead to lubricant additive solutions being tailored for DLC surfaces to provide excellent durability (wear) as well as similar or increased fuel economy (low friction). In this work, the wear and friction properties of DLC coating under boundary lubrication conditions have been investigated.A pin-on-plate tribotester was used to run the experiments using HSS steel plates coated with 15 at.% hydrogenated DLC (a-C:15H) sliding against cast iron pins. One type of fully formulated oil with and without ZDDP and two levels of a MoDTC type friction modifier (Mo-FM) was used in this study. The friction and wear response of the fully formulated oils is discussed in detail.Furthermore, optical and scanning electron microscopes (SEM) were used to observe the wear scar and obtain wear mechanisms. Energy-Dispersive X-ray analysis (EDX) and X-ray Photoelectron Spectroscopy (XPS) analysis were performed on the tribofilms to understand the tribochemical interactions between oil additives and the DLC coating. A nano-indentation study was conducted to observe the changes in the structure of the coating, which can provide a better insight into the wear mode and failure mechanism of such hard coatings.In the light of the physical observations and tribochemical analysis of the wear scar, the wear behaviour of a hydrogenated DLC (a-C:15H) coating was found to depend on the concentration of the MoDTC friction modifier and the wear performance is much better when ZDDP is present in the oil. The tribochemical mechanisms, which contribute to this behaviour, are discussed in this paper.

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Tribological performance of aUHMWPE‐based multiscale composite under different lubrication and loads

Vadivel

Somberg

Kalin

et al. 2022

Lubrication Science

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An UHMWPE-based multiscale composite containing graphene oxide, nanodiamonds, and short carbon fibres has shown excellent performance under distilled water lubrication. However, it is crucial to evaluate its tribological performance under conditions which more accurately represent the final application. In this study, the tribological performance of the developed UHMWPE-based multiscale composite is evaluated and compared with neat UHMWPE under different lubricating conditions: no lubricant (dry), in seawater (SW) and in an environmentally acceptable lubricant (EAL). While neat UHMWPE displays a lower friction and wear in dry conditions, the multiscale composite performs better under SW and EAL lubrication. A maximum reduction in friction coefficient of 77% and specific wear rate of 88% are obtained in SW. Under EAL lubricated conditions, the multiscale composite has a maximum reduction in specific wear rate of up to 75%.

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Improved mixed and boundary lubrication with glycerol-diamond technology

Cited by 21 publications

References 10 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

The effect of MoDTC-type friction modifier on the wear performance of a hydrogenated DLC coating

Tribological performance of aUHMWPE‐based multiscale composite under different lubrication and loads

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