Fuel Efficient Engine Oils, Additive Interactions, Boundary Friction, and Wear

Korček, Š.; Jensen, R. K.; Johnson, M. D.; Sorab, Jagadish

doi:10.1016/s0167-8922(99)80024-8

Cited by 27 publications

(18 citation statements)

References 5 publications

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“…The MoS 2 tribofilm has a lattice-layered structure with low shear strength which makes it possible for low friction between the tribology components. 6,[11][12][13][14] MoS 2 within the MoDTC tribofilm was reported to form on the rubbing surfaces in the presence of air and oxygen. 6 Graham et al 7 concluded that the friction-reducing capability of the MoDTC tribofilm is highly dependent upon the temperature and MoDTC concentration.…”

Section: Introductionmentioning

confidence: 99%

Transient processes of MoS₂ tribofilm formation under boundary lubrication

Rai

Neville

Morina

2016

Lubrication Science

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A tribochemistry study that involves the application of Raman spectroscopy surface analysis has been undertaken to understand the time-dependent tribochemical reactions, for lubrication by Molybdenum dialkyl-dithiocarbamate (MoDTC) occurring in boundary lubricated conditions. Under the conditions of rubbing and high temperature, time-resolved Raman spectroscopy results show the intermediate steps that lead to the MoDTC additive to be tribochemically structured on the wear scar of the contacting surface. A MoS2 tribofilm with a lattice layer structure is observed on the wear scar whenever the lowest friction was achieved. An apparent shift of the A1g and E2g Raman modes, indicating qualitative and quantitative information on the MoS2 tribofilm formed, is observed to be related to low friction. Detailed analyses of Raman spectra obtained on wear scars at different test durations and temperatures indicate that both temperature and rubbing are needed for the formation of low friction MoS2 tribofilm.

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Section: Introductionmentioning

confidence: 99%

Transient processes of MoS₂ tribofilm formation under boundary lubrication

Rai

Neville

Morina

2016

Lubrication Science

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“…Despite this not much is known about the tribofilms' kinetics of formation and removal. Tribofilm formation is a dynamic process which involves creation, removal and replenishment [7], and so in order to understand the formation of stable tribofilms it is very important to understand the kinetics of these processes. This study focuses only on the tribofilms formed from model lubricants that contain only ZDDP, MoDTC and ZDDP/MoDTC.…”

Section: Introductionmentioning

confidence: 99%

Tribofilms: aspects of formation, stability and removal

Morina¹,

Neville²

2007

J. Phys. D: Appl. Phys.

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There has been much attention paid to the lubricant additives zinc dialkyldithiphosphate and molybdenum dialkyldithiocarbamate as the most commonly used antiwear/antioxidant and friction modifiers. The mechanism by which they function has been the subject of much research work. As a result of these efforts the tribofilms formed from the above additives are fully chemically characterized but understanding the physical properties and the dynamics of their formation, stability and removal is still not satisfactory and needs more research. This paper reviews the general characteristics of tribofilms formed from these additives in single component systems and also on their interactions as well as the current understanding of the dynamics of their formation. Experimental work is then presented alongside discussion of the literature to present a current status of understanding of the stability and the removal of tribofilms. The effect of temperature and additive interactions on the thickness of the steady state tribofilms, and consequently the effect on friction performance, is evaluated. The results of this study show that temperature and additive interactions play a significant role on the dynamic process of tribofilm formation as well as its chemical properties. This study also highlights the areas in which further development is needed to ensure progress in understanding of the tribofilm's formation and removal processes.

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“…Tribotest joirvrinl 7-3, Mnvcli 2001. (7) 288 ISSN 1354-4063 $8.00 + $8.00 The fuel efficiency of engines can be improved by various means, such as engine design, material selection, application of coatings, surface modification, and also through the use of fuel-efficient engine oils. In this process, engine oil has become a central design parameter and tribology a highly significant tool.…”

Section: Fuel Efficiency Of Engines and Tribologymentioning

confidence: 99%

“…It has previously been _ I Tribotestjoiirrinl7-3, Mnrch 2001. (7) 199 ZSSN 1354-4063 $8.00 + $8.00 shown in laboratory experiments that consumption of these two compounds can be slowed down by other antioxidant additives that trap peroxyl radicals" or decompose peroxides. The best results so far have been obtained using sulphur-containing peroxide-decomposing additives.12 However, even in this case, the protection of MoDTC/ZnDTP additive systems is not sufficient to prevent the premature loss of friction-reducing capability in larger engines ( Figure 10).…”

Section: Retention Of Friction-reducing Capabilitiesmentioning

confidence: 99%