Improvement of boundary lubrication properties of diamond-like carbon (DLC) films due to metal addition

Miyake, Shojiro; Saito, Tadashi; Yasuda, Yoshiteru; Okamoto, Yasumasa; Kano, Makoto

doi:10.1016/j.triboint.2004.01.014

Cited by 92 publications

(50 citation statements)

References 13 publications

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“…The transfer layer contains a lubricious MoS 2 compound, which is a product of the thermal decomposition of Mo-DTC used as friction modifier [20]. However the decomposition also …”

Section: Importance Of Combined Mo and W Dopingmentioning

confidence: 99%

“…The low friction of Ti-DLC and Mo-DLC coatings was attributed to the formation of high strength metal carbides in the defective parts of the carbon network and formation of MoS 2 -containing tribolayer due to thermal decomposition of Mo-DTC [20]. Similar to ambient temperature, formation of MoS 2 -containing tribolayer in the temperature range of 50°C -100°C decreases the friction (µ~0.02 -0.14) of various metaldoped (such as Si-doped, Ti-doped and W-doped) DLC coatings under different test conditions [10], [21].…”

Section: Introductionmentioning

confidence: 99%

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Friction and wear behaviour of Mo–W doped carbon-based coating during boundary lubricated sliding

Hovsepian

Mandal

Ehiasarian

et al. 2016

Applied Surface Science

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A molybdenum and tungsten doped carbon-based coating (Mo−W−C) was developed in order to provide low friction in boundary lubricated sliding condition at ambient and at high temperature. The Mo−W−C coating showed the lowest friction coefficient among a number of commercially available state-of-the-art DLC coatings at ambient temperature. At elevated temperature (200°C), Mo−W−C coating showed a significant reduction in friction coefficient with sliding distance in contrast to DLC coatings. Raman spectroscopy revealed the importance of combined Mo and W doping for achieving low friction at both ambient and high temperature. The significant decrease in friction and wear rate was attributed to the presence of graphitic carbon debris (from coating) and 'in-situ' formed metal sulphides (WS 2 and MoS 2 , where metals were supplied from coating and sulphur from engine oil) in the transfer layer.

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“…The transfer layer contains a lubricious MoS 2 compound, which is a product of the thermal decomposition of Mo-DTC used as friction modifier [20]. However the decomposition also …”

Section: Importance Of Combined Mo and W Dopingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Friction and wear behaviour of Mo–W doped carbon-based coating during boundary lubricated sliding

Hovsepian

Mandal

Ehiasarian

et al. 2016

Applied Surface Science

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“…In addition, DLC coatings have been reported to be chemically inert using a steel pin sliding against DLC-coated disks lubricated in oil containing ZDDP and/or MoDTC [25]. In contrast, in recently published works, molybdenum-based friction modifiers have been reported to form low friction MoS 2 sheets and ZDDPderived compounds were detected on the DLC coating providing low friction and better wear performance under boundary lubrication conditions [26][27][28][29][30][31][32][33]. Therefore, the published results have been found to be contradictory and a comprehensive understanding of DLC tribochemistry is still to be clearly produced.…”

Section: Introductionmentioning

confidence: 99%

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Kosarieh

Morina

Lainé

et al. 2013

Surface and Coatings Technology

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Abstract:Diamond-like carbon (DLC) coatings show extremely good promise for a number of applications in automotive components as they exhibit excellent tribological properties such as low friction and good wear resistance. This can impact on improved fuel economy and durability of the engine components. Much work has been reported on the dry sliding of DLC coatings with less so in lubricated contacts and, as such, there is a need to further understand the tribochemistry of lubricated DLC contacts. Commercially-available oils are normally optimized to work on ferrous surfaces. Previous studies on DLC lubricated contacts have tended to use model oil systems rather than fully formulated lubricants and from this an interesting picture of lubrication mechanisms is emerging. Optimising compatibility between a surface and a set of lubricant additives may lead to excellent durability (wear) as well as increased fuel economy (low friction). In this work, the friction and wear properties of a DLC coating under boundary lubrication conditions have been investigated and the tribological performance compared with that of an uncoated steel system. A pin-on-plate tribotester was used to run the experiments using High speed steel (HSS) M2 grade plates coated with 15 at.% hydrogenated DLC (a-C:15H) sliding against cast iron pins. A Group III mineral base oil, fully synthetic Group IV PAO and four different fully formulated oils were used in this study. Furthermore optical and scanning electron microscopes (SEM) were used to observe the wear scar and to assess the durability of the coatings. Energy-Dispersive X-ray analysis (EDX), X-ray Photoelectron Spectroscopy (XPS) and Raman spectroscopy analyses were performed on the tribofilms to understand the tribochemical interactions between oil additives and the a-C:15H coating.This study show that the durability of the a-C:15H coating strongly depends on the selected additive package in the oils. In addition the effect of detergent, dispersant and antioxidants on the performance of the Molybdenum-based friction modifier (Mo-FM) and ZDDP anti-wear additive were investigated and results are reported in this paper.

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“…The fabrication of DLC films containing silicon and other elements at the interface between substrates and films has been proposed. The tribological properties of these DLC films were investigated [6][7][8] . As additive materials in DLC films, metals such as titanium, and ferrous (Fe) in DLC films, can improve boundary lubrication properties 8) .…”

Section: Introductionmentioning

confidence: 99%

“…The tribological properties of these DLC films were investigated [6][7][8] . As additive materials in DLC films, metals such as titanium, and ferrous (Fe) in DLC films, can improve boundary lubrication properties 8) . Furthermore, the improvement in the boundary lubrication properties of DLC films is also expected with the incorporation of some metals such as titanium.…”

Section: Introductionmentioning

confidence: 99%

Boundary Lubrication Characteristic of Metal-Containing Diamond-Like Carbon (DLC) Films with Poly Alpha Olefin (PAO) Lubricant

et al. 2008

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Improvement of boundary lubrication properties of diamond-like carbon (DLC) films due to metal addition

Cited by 92 publications

References 13 publications

Friction and wear behaviour of Mo–W doped carbon-based coating during boundary lubricated sliding

Friction and wear behaviour of Mo–W doped carbon-based coating during boundary lubricated sliding

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Boundary Lubrication Characteristic of Metal-Containing Diamond-Like Carbon (DLC) Films with Poly Alpha Olefin (PAO) Lubricant

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