Frictional properties of organomolybdenum compounds in the presence of ZDTPs under sliding conditions

Muraki, Masayoshi; Wada, Hisayuki

doi:10.1016/s0167-8922(08)70647-3

Cited by 23 publications

(25 citation statements)

References 9 publications

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“…It was reported that the ZnDTP-derived tribofilm typically could be form even on the non-ferrous DLC surfaces [10], and ZnDTP had the important role to provide the sulfur atoms to promote the sulfuration of the oxysulphide [11]. It has been also reported that ZnDTP can increase the tribo-chemical formation of MoS2 on the steel surfaces in the combination with MoDTC [2][3][4]11,23,30]. However, TMS-A sample showed small intensities of P-oxides (PO2 − and PO3 − ) on the counter steel ball surface, as shown in Fig.…”

Section: Fig4 Optical Micrograph Of Wear Tracks On the Dlc-coated DImentioning

confidence: 99%

“…Molybdenum dithiocarbamate (MoDTC) was also applied to automotive lubricants and greases as a friction-modifier to improve the fuel efficiency. These have been widely spread to automotive lubrication blends [2][3][4]. Automotive lubrication trend is directed toward the application of low-viscosity oils for further improving fuel efficiency [5,6].…”

Section: Introductionmentioning

confidence: 99%

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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: Fig4 Optical Micrograph Of Wear Tracks On the Dlc-coated DImentioning

confidence: 99%

Section: Introductionmentioning

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) are applied to automotive lubricants and greases as a friction modifier to improve the fuel efficiency and the durability, later. Today, they are widely spread to automotive lubrication blends [2][3][4]. In addition, recent automotive lubrication trends shift toward the application of low-viscosity oils to improve fuel efficiency [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of surface morphology of diamond-like carbon coating on friction, wear behavior and tribo-chemical reactions under engine-oil lubricated condition

Komori

Umehara

2015

Tribology International

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“…Blending an optimum amount of friction modifiers into lubricant is one of the general measures to reduce fuel consumption induced by the friction loss. It is known that the friction coefficient on the metal surface can be reduced by adding some molybdenum compounds such as molybdenum dithiocarbamate (MoDTC) and molybdenum dithio-phosphate (MoDTP) [1][2][3][4] . However, these additives only show good friction-reducing effect in a fresh state and deteriorate quickly with time.…”

Section: Introductionmentioning

confidence: 99%

Analyses of the Adsorption Structures of Friction Modifiers by Means of Quantitative Structure-Property Relationship Method and Sum Frequency Generation Spectroscopy

et al. 2010

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Blending an optimum amount of friction modifiers into lubricant is one of the important measures to reduce fuel consumption induced by the frictional loss for automobiles. However, the agents containing metal or phosphorus compounds can cause catalyst poisoning and clogging in the filters of the exhaust gas refining system. Thus, development of metal-free and phosphorus-free agents with a long-term stability under real working condition is highly desirable. In the present work, the friction coefficients on the metal surface in lubricants containing different friction modifiers were investigated by the reciprocating friction test in detail. A statistical method based on the quantitative structure-property relationship (QSPR) analysis has been employed to correlate the chemical nature of additives with their effect on the friction reduction behaviors. An empirical equation relating the molecular structure and its friction reduction efficiency has been proposed as a standard for a good friction modifier. Furthermore, a surface-sensitive vibration spectroscopy, sum frequency generation (SFG) spectroscopy, has been used to analyze the molecular structures of the lubricants adsorbed on the metal surface. The SFG observation suggested that a certain relationship between the adsorption structure and friction reduction effect of these agents.

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Frictional properties of organomolybdenum compounds in the presence of ZDTPs under sliding conditions

Cited by 23 publications

References 9 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

Effect of surface morphology of diamond-like carbon coating on friction, wear behavior and tribo-chemical reactions under engine-oil lubricated condition

Analyses of the Adsorption Structures of Friction Modifiers by Means of Quantitative Structure-Property Relationship Method and Sum Frequency Generation Spectroscopy

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