Tribological performance of three advanced piston rings in the presence of MoDTC-modified GF-3 oils

Ma, Youguang; Zhao, Wei; Li, Sheng‐Hua; Jin, Yuansheng; Wang, Yucong; Simon, Tung C.

doi:10.1007/s11249-004-1759-6

Cited by 30 publications

(14 citation statements)

References 16 publications

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“…Like ZDDP, MoDTC is relatively indifferent to the nature of the substrate on which it forms MoS 2 . Thus, it reduces friction not just on steel but also on pre-formed ZDDP tribofilms [56], ceramics [57] and DLCs [58]. Graham et al found that the formation of MoS 2 from MoDTC and consequent friction reduction was strongly dependent on the severity of the contact conditions [59].…”

Section: Discussionmentioning

confidence: 99%

On the Mechanism of ZDDP Antiwear Film Formation

2016

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Zinc dialkyldithiophosphate additives are used to control wear and inhibit oxidation in almost all engine oils as well as many other types of lubricant. They limit wear primarily by forming a thick, protective, phosphate glass-based tribofilm on rubbing surfaces. This film formation can occur at low temperatures and is relatively indifferent to the chemical nature of the substrate. There has been considerable debate as to what drives ZDDP tribofilm formation, why it occurs only on surfaces that experience sliding and whether film formation is controlled primarily by temperature, pressure, triboemission or some other factor. This paper describes a novel approach to the problem by studying the formation of ZDDP films in full film EHD conditions from two lubricants having very different EHD friction properties. This shows that ZDDP film formation does not require solid-solid rubbing contact but is driven simply by applied shear stress, in accord with a stress-promoted thermal activation model. The shear stress present in a high-pressure contact can reduce the thermal activation energy for ZDDP by at least half, greatly increasing the reaction rate. This mechanism explains the origins of many practically important features of ZDDP films; their topography, their thickness and the conditions under which they form. The insights that this study provides should prove valuable both in optimising ZDDP structure and in modelling ZDDP antiwear behaviour. The findings also highlight the importance of mechanochemistry to the behaviour of lubricant additives in general.

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Section: Discussionmentioning

confidence: 99%

On the Mechanism of ZDDP Antiwear Film Formation

2016

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“…The friction and wear properties of each disc specimen were investigated using a reciprocating Optimol SRV tribometer [12,14,15] against ASTM 52100 steel balls with a diameter of 10.0 mm and polytetrafluoroethylene (PTFE) balls with a diameter of 9.5 mm. These friction tests were performed under lubrication using a typical oil used in the sliding guide-ways of machine tools.…”

Section: Methodsmentioning

confidence: 99%

Friction and wear properties of Fe–Mo intermetallic compounds under oil lubrication

et al. 2007

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“…Oil is an important class of liquid lubricant while grease falls in the category of semi-solid ones. The lubricating characteristic of oil lubricants is very much controlled by the nature of the base oil and the additives therein (Ref [4][5][6]. Solid lubricants are among the important constituents of additives .…”

Section: Introductionmentioning

confidence: 99%

Lubricated Sliding Wear Behavior of a Cast Iron: Effect of Graphite and/or Talc Fraction in Oil

Prasad

2009

J. of Materi Eng and Perform

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The effects of suspended solid lubricant (graphite and/or talc) particles in oil on the sliding wear response of a cast iron have been studied in this investigation. The role played by the changing concentration of the talc and graphite particles added to the oil separately as well as in combination toward controlling the wear behavior of the cast iron has also been analyzed. The investigation strongly suggests beneficial effects of the solid lubricant particles suspended in lubricating oil in terms of decreasing wear rate, frictional heating, and friction coefficient. Interestingly, increasing concentration of the suspended lubricant particles in oil led to reduction in the mentioned properties initially followed by the attainment of the minimum at a specific concentration of the solid lubricants. At still higher concentrations, the trend reversed in the case of wear rate and friction coefficient while it remained unaffected as far as the influence on frictional heating is concerned. Formation of stable lubricating film/layer was noted to be responsible for the improved wear performance of the samples while rupture of the lubricant film led to deterioration in wear behavior.

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Tribological performance of three advanced piston rings in the presence of MoDTC-modified GF-3 oils

Cited by 30 publications

References 16 publications

On the Mechanism of ZDDP Antiwear Film Formation

On the Mechanism of ZDDP Antiwear Film Formation

Friction and wear properties of Fe–Mo intermetallic compounds under oil lubrication

Lubricated Sliding Wear Behavior of a Cast Iron: Effect of Graphite and/or Talc Fraction in Oil

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