Behaviour of Boundary Lubricating Additives on DLC Coatings

Topolovec-Miklozic, Ksenija; Forbus, T. Reg; Lockwood, Frances E.; Spikes, H. A.

doi:10.1115/ijtc2007-44485

Cited by 21 publications

(29 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…boundary friction increasing with mean speed; Figure ) with gear oils 2, 4 and 5 is an indication of the formation of an effective film, derived possibly from organic FM present in these gear oils. Such low‐speed low‐friction behaviour is attributed to adsorbed films from FM as reported in a similar study by Topolovec‐Miklozic et al ., Ingram et al . and Campen et al .…”

Section: Discussionsupporting

confidence: 80%

Influence of temperature on the friction performance of gear oils in rolling-sliding and pure sliding contacts

et al. 2013

View full text Add to dashboard Cite

The friction behaviour of five different gear oils in rolling–sliding and pure sliding contacts and how temperature influences their friction properties were investigated. It is found that increasing temperature decreases boundary friction with gear oils that contain friction modifiers while not for other gear oils, at all contact pressures investigated. In mixed lubrication region, temperature decreases friction at low contact pressures while increases friction at high contact pressures. The effect of slide–roll ratio on friction is significant in boundary lubrication region especially at higher temperature while less significant in mixed lubrication region at both low and high temperatures. The ranking of gear oils for friction in boundary and mixed lubrication regimes is similar both in rolling–sliding and pure sliding contacts, regardless of temperature. Copyright © 2013 John Wiley & Sons, Ltd.

show abstract

Section: Discussionsupporting

confidence: 80%

Influence of temperature on the friction performance of gear oils in rolling-sliding and pure sliding contacts

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The absence of any formed tribolm on non-doped H-DLC was reported extensively in the literature, [37][38][39][40][41][42] whereas other studies found that some thin tribolms can be formed. [43][44][45][46][47][48][49] The formation and composition of such lms will be investigated further using the in situ surface analysis of XANES P and S kedges, which is discussed in detail in the subsequent sections.…”

Section: Friction and Wear Performancementioning

confidence: 99%

In situ synchrotron XAS study of the decomposition kinetics of ZDDP triboreactive interfaces

et al. 2018

View full text Add to dashboard Cite

One of the major obstacles in replacing the widely used zinc dialkyldithiophosphate (ZDDP) antiwear additive with a more environmentally friendly one is the difficulty of time-resolving the surface species resulting from its decomposition mechanism under high contact pressure and temperature. To tackle this issue, a newly developed miniature pin-on-disc tribotester was coupled with synchrotron X-ray absorption spectroscopy (XAS) to perform in situ tribological tests while examining the composition of the formed triboreactive films. The results showed that in the case of bare steel surfaces the initial decomposition products are mainly zinc sulfate species, which with further shearing and heating are reduced to zinc sulfide mixed with metal oxides. The mixed base layer seems to enhance the tenacity of the subsequently formed zinc phosphate layers composing the main bulk of the protective triboreactive film. This base layer was not observed in the case of coated substrates with hydrogenated diamond-like carbon (a-C:H DLC) coating, which results in the formation of less durable films of small volume barely covering the contacting surfaces and readily removed by shear. Comprehensive decomposition pathways and kinetics for the ZDDP triboreactive films are proposed, which enable the control and modification of the ZDDP triboreactive films.

show abstract

“…Since the molecular chemistry of the ionic liquid additive in both lubricant mixtures is identical, better tribological behaviour was contributed to the higher concentration, and hence, higher reserve of the additive, which can form durable protective film. This mechanism was already adopted for the certain group of the friction modifiers, [36][37][38][39][40] and it was proven in our previous work. 19 The additional data that confirm the better performance of the protective film generated from the C8-ImIL/I mixture are gained from the ECR measurements ( Figure 7).…”

Section: Discussionmentioning

confidence: 99%

Frictional behaviour of imidazolium sulfate ionic liquid additives under mixed slide to roll conditions: part 2 — influence of concentration and chemical composition of ionic liquid additive

Pejaković

Igartua

Kalin

2015

Lubrication Science

View full text Add to dashboard Cite

Current work presents the investigation of frictional behaviour of ionic liquid lubricant mixtures under mixed slide to roll ratio. On the contrary to the previous study, which focuses on determination of the most suitable ionic liquid additive for identical ionic liquid weight concentration in lubricant mixture, this work had two scopes. The first one was to determine the optimal chemical composition of ionic liquid additive by investigating the lubricant mixtures with identical molar ratio, and the second one, to optimise additive concentration for certain ionic liquid structure. The changes were observed by two means. Namely, in frictional behaviour, ionic liquid concentration plays significant role. On the contrary, for the mixtures with identical molar concentration, the chemical structures with longer alkyl substituent do not always exhibit improvement. Experiments also revealed correlation between ionic liquid structures, concentration and wear. Atomic force microscopy (AFM) analysis of worn surfaces confirmed the above statements. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Behaviour of Boundary Lubricating Additives on DLC Coatings

Cited by 21 publications

References 0 publications

Influence of temperature on the friction performance of gear oils in rolling-sliding and pure sliding contacts

Influence of temperature on the friction performance of gear oils in rolling-sliding and pure sliding contacts

In situ synchrotron XAS study of the decomposition kinetics of ZDDP triboreactive interfaces

Frictional behaviour of imidazolium sulfate ionic liquid additives under mixed slide to roll conditions: part 2 — influence of concentration and chemical composition of ionic liquid additive

Contact Info

Product

Resources

About