ZDDP and MoDTC interactions in boundary lubrication—The effect of temperature and ZDDP/MoDTC ratio

Morina, Ardian; Neville, Anne; Priest, Martin; Green, J.H.

doi:10.1016/j.triboint.2006.03.001

Cited by 185 publications

(141 citation statements)

References 27 publications

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“…Temperature is reported to affect the tribological performance of ZDDP [53,54]. To study the effect of temperature on the durability of the tribofilm, tribological tests were carried out with the same conditions to form the tribofilm on the surfaces.…”

Section: Effect Of Temperaturementioning

confidence: 99%

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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Understanding the true interfacial mechanisms involved in the growth of tribofilms generated by Zinc Dialkyl Dithiophosphate (ZDDP) is important because it is the most widely used antiwear additive and there is legislative pressure to find efficient environmentally-friendly replacements. The main focus of this study is to investigate the durability of the ZDDP tribofilm and correlate it to the chemical and physical properties of the glassy polyphosphates.A novel experimental method has been developed to study the effect of lubricant temperature and contact load on tribofilm growth and durability. Results show that physical parameters such as temperature and pressure significantly influence the tribofilm durability. XPS analyses were carried out before suspending the test and after changing the oil to assess the difference in chemical structure of the tribofilm before and after stopping the test. The chemical analyses suggest that there are different chemical properties across the thickness of the tribofilm and these determine the durability characteristics.

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Section: Effect Of Temperaturementioning

confidence: 99%

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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“…The ball-on-disk tests were conducted intentionally at the lower temperature as 40°C. It was reported that MoDTC and ZnDDP additives became active on steel surface to form tribofilm at the higher temperature more than 80°C [23]. In this ball-on-disk test, we investigated how the chemical reactions induced by thermal and strain effects during sliding contact varied essentially due to difference in characteristics of DLC coatings.…”

Section: Tribological Tests and Surface Analysis 241 Ball-on-disk Testmentioning

confidence: 99%

“…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%

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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“…Previous studies [34] have shown that fully formulated oil with 700 ppm of MoDTC reduced the friction torque by 29% and the friction torque were independent of camshaft speed/surface coatings. This was attributed to the formation of MoS 2 sheets which have weak Van der Waals interactions between layers and covalent bond between atomic species [34,39]. These tribolayers control friction on interacting surface [34].…”

Section: Effects Of Engine Oil Formulationmentioning

confidence: 99%

Development of valve train rig for assessment of cam/follower tribochemistry

Ofune

Banks

Morina

et al. 2016

Tribology International

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Component bench tests are a crucial part of a tribology assessment experimental programme for most engines and subsystems. This is because they test the components under conditions simulating the operating characteristics of the system. These have become very important as they shed more light into the friction, wear, lubrication and importantly for this study, the tribochemistry of valve train systems. This work outlines the procedure for the development of a single cam rig (SCR) from a 1.25L FORD Zetec (SE) engine. Friction plots were used to validate the data obtained from the newly developed single cam rig with Mn-phosphate coated and polished follower against a cast iron camshaft. The tribofilm formed using normal and mid Sulphated Ash, Phosphorus and Sulphur (SAPS) 5W-30 oils were evaluated and correlated to the friction and wear properties of the tribopair.Raman and FIB-SEM/EDX investigations of the tribochemical films showed that the normal SAPS oil produced patchy, thick (80-100 nm) and well dispersed tribofilm with better wear prevention capabilities. It was observed that Mid SAPS oil had lower wear prevention due to loosely dispersed and thin tribofilms. Absence of tribofilms at the centre of the insert with this oil also suggests that formation and removal processes are an integral part of the wear mechanisms in highly loaded cam follower systems.

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ZDDP and MoDTC interactions in boundary lubrication—The effect of temperature and ZDDP/MoDTC ratio

Cited by 185 publications

References 27 publications

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

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

Development of valve train rig for assessment of cam/follower tribochemistry

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