MoS2 single sheet lubrication by molybdenum dithiocarbamate

Grossiord, C.; Varlot, K.; Martin, Jean Michel; Mogne, Th. Le; Esnouf, C.; Inoue, Kazuaki

doi:10.1016/s0301-679x(98)00094-2

Cited by 276 publications

(207 citation statements)

References 7 publications

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“…We conducted TOF-SIMS analysis for worn surface of both steel balls and DLC disks after ball-on-disk tests with the engine-oil containing MoDTC and ZnDTP additives excluding TMS/C7H8 coating sample because the TMS/C7H8 sample was worn remarkably and the substrate was partially exposed. MoDTC is decomposed during tribological contact to form MoS2 tribofilm on surfaces, leading friction reduction [10,25,26]. MoDTC decomposes into the core unit of MoDTC molecule, and this forms the oxysulfide [11].…”

Section: Tribofilm Compositions and Friction Behaviormentioning

confidence: 99%

Friction and Wear Properties of Tetrahedral Si-Containing Hydrogenated Diamond-Like Carbon Coating under Lubricated Condition with Engine-Oil Containing ZnDTP and MoDTC

Komori

Umehara

2017

Tribology Online

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In this study, we investigated tribological properties of "tetrahedral" Si-containing hydrogenated DLC coating (TMS coating) during sliding against steel or cast-iron lubricated with engine-oil containing MoDTC and ZnDTP additives. TMS coatings derived from only tetramethylsilane were prepared using PACVD with high-bias process. TMS coating had the highly carbon sp 3 bonded structure induced by Si (over 20 at.%) with high hydrogen content (30 at.%). TOF-SIMS analysis showed that TMS coating could form the additive-derived tribofilm on both of the non-ferrous coating surface and the ferrous counter surface to promote Mo-sulfide formation effectively, leading a low friction coefficient. The tribo-chemical reactions were related not only to Mo-sulfides formation, but also reduction of Mo-oxides. Mo-oxides could react with DLC material and induce hydrogen evolution and transformation into further weak carbon structure, causing an increasing wear of hydrogenated DLCs. TMS coating showed no significant wear in spite of plenty hydrogen content. Si induced sp 3 bond and could act so as not to induce clustering of the sp 2 phase. This could inhibit increasing wear of the DLC in the presence of MoDTC. The effectiveness of TMS coating in friction and wear behavior was shown to depend on tribo-chemical reactions and transformation of carbon bond structure.

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Section: Tribofilm Compositions and Friction Behaviormentioning

confidence: 99%

Friction and Wear Properties of Tetrahedral Si-Containing Hydrogenated Diamond-Like Carbon Coating under Lubricated Condition with Engine-Oil Containing ZnDTP and MoDTC

Komori

Umehara

2017

Tribology Online

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“…Molybdenum dithiocarbamate (MoDTC) and Zinc dialkyldithiophosphates (ZDDP) are well-known friction modifier and anti-wear additives respectively, used for ferrous surfaces. MoS 2 low friction sheets, derived from MoDTC decomposition, provide low friction at the tribological contacts [19][20][21].…”

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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“…And high concentrations of remaining elements indicate formation of compounds by these elements at tribofilm region within themselves or their oxides. [14,25,29]. These products are abrasive and could increase abrasion of the surface once they are dislodged from the surface resulting in three body wear mechanism.…”

Section: Edx Elemental Maps Of Wear Surfacementioning

confidence: 99%

“…The friction reduction mechanism of MoDTC that is generally accepted is by formation of individual MoS2 layers rather than cleavage or slip mechanisms that are prevalent in a MoS2. However, pathways for tribochemical degradation of MoDTC to form MoS2 sheets aren't entirely understood [14]. Tungsten disulfide (WS2) is a dichalcogenide that is used in extreme pressure applications and could potentially be a competitive replacement to MoS2 [15].…”

Section: Introductionmentioning

confidence: 99%

Wear and Friction of Greases Containing Organic and Inorganic Sulfur Carriers

2017

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Lithium based grease formulations are the most common lubricants used in industry today. Sulfur containing additives play a key role in improving wear and friction performance of these greases. The current study is focused on developing an understanding of characteristics of chemical bonding between sulfur carriers (MoS2, WS2 , MoDTC and organo tungstate ) and the interacting surfaces and evaluates their effect as anti-wear and anti-friction agents. ASTM D2266 and spectrum loading tests with varying loads while keeping other tests parameters constant were performed on the grease blends to understand effects of cyclic loading on tribochemical degradation of sulfur carriers. Tribofilms formed on the wear surface were analyzed using surface characterization techniques like SEM, EDS and Stereo Optical Microscopes. Wear scar diameter (WSD) and coefficient of friction (COF) were reported for the tests performed. This research aims to gain better insight on the atomic coordination or oxidation states of sulfur atom in additives and their correlation with anti-wear and extreme pressure performance when blended in greases.

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MoS2 single sheet lubrication by molybdenum dithiocarbamate

Cited by 276 publications

References 7 publications

Friction and Wear Properties of Tetrahedral Si-Containing Hydrogenated Diamond-Like Carbon Coating under Lubricated Condition with Engine-Oil Containing ZnDTP and MoDTC

Friction and Wear Properties of Tetrahedral Si-Containing Hydrogenated Diamond-Like Carbon Coating under Lubricated Condition with Engine-Oil Containing ZnDTP and MoDTC

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

Wear and Friction of Greases Containing Organic and Inorganic Sulfur Carriers

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