Effect of ZDDP concentration on the thermal film formation on steel, hydrogenated non-doped and Si-doped DLC

Akbari, Saeed; Kovač, Janez; Kalin, Mitjan

doi:10.1016/j.apsusc.2016.04.182

Cited by 18 publications

(13 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A peak at 1087 cm −1 is detected, and it can be assigned to the asymmetric vibration of either PO 3 or SO 4 . The peak at 1125 cm −1 can be assigned to either the stretching vibration of POSi, asymmetric vibration of PO 3 −2 , or an overlap of both peaks. For the longest period, 24 hours, a new weak peak is obtained at 750 cm −1 , which can be assigned to the symmetric vibration of POP .…”

Section: Resultsmentioning

confidence: 95%

“…The results show that among the five conditions, only for 2 hours at 175°C, 6 hours at 175°C, and 24 hours at 150°C were peaks detected and showed the presence of a thermal film. The peak at 926 cm −1 can be assigned to either stretching vibration of PO or the asymmetric vibration of POP . A peak at 1087 cm −1 is detected, and it can be assigned to the asymmetric vibration of either PO 3 or SO 4 .…”

Section: Resultsmentioning

confidence: 97%

“…In contrast to ILs, a large number of previous papers have focused on the lubrication mechanism of ZDDP . Some have focused on the reactivity of ZDDP with steel or hard coatings at elevated temperatures to obtain a full understanding of its lubrication mechanism. The results have shown that ZDDP is capable of interacting with the examined surfaces and forms a thermal film; the thickness of this film is increased with increasing time while the chemistry is strongly influenced by temperature .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reactivity of oil‐soluble IL with silicon surface at elevated temperature

Al-Sallami

Parsaeian

Neville

2019

Lubrication Science

View full text Add to dashboard Cite

The reactivity of an oil‐miscible ionic liquid, phosphonium phosphate (PP), and the common anti‐wear additive zinc dialkyl dithio phosphate (ZDDP) with a solid surface at elevated temperature in the absence of any tribological motion is investigated. Understanding the thermal film build up, composition, and relative thickness will help in the understanding of lubrication mechanisms once tribological effects are introduced. Attenuated total reflection–Fourier transform infrared (ATR‐FTIR), scanning electron microscopy–energy dispersive spectroscopy (SEM‐EDS), and X‐ray photoelectron spectroscopy (XPS) are employed to characterise silicon surfaces before and after the experiments in terms of surface chemistry and surface morphology. The results show that both additives react with the silicon surface to produce thermal films. However, ZDDP forms a thicker film. PP reacts with the silicon and forms a thermal film, but the reaction rate is self‐limited such that an increase of time to 24 hours does not significantly increase the film thickness.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reactivity of oil‐soluble IL with silicon surface at elevated temperature

Al-Sallami

Parsaeian

Neville

2019

Lubrication Science

View full text Add to dashboard Cite

show abstract

“…The results are in line with several previous studies, which reported that the P-based additives such as ZDDP can react and form thin tribolms on DLC coatings even without containing any doped cations. 43,44,46,47,49 In contrast, other studies found that no tribolms can be formed on non-doped DLC coatings without metallic cations. 37,[40][41][42] The main factor behind the wide disparity between the formation and absence of tribolms on DLC coatings appears to be related to the tribolm tenacity as discussed earlier.…”

Section: Zddp Tribolms Formed At 80 C and 10 Gpa: Dlc Coated Countementioning

confidence: 88%

“…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

High temperature solid/liquid lubrication behaviours of DLC films

Zhu

Dong

Zeng

2021

Lubrication Science

View full text Add to dashboard Cite

The high temperature solid/liquid lubrication performances of DLC (diamond like carbon) films were investigated by a ball‐on‐disc tribometer under perfluoropolyether (PFPE) oil. The friction and wear behaviours of DLC films sliding against a Si3N4 ball at different friction pairs, sliding speeds and temperatures were evaluated systematically under dry friction. Moreover, tribological properties of DLC films were investigated under PFPE oils lubrication at elevated temperature. The experimental results show that the solid–liquid synergy lubrication is beneficial to improve the tribological properties of the steel‐related friction system and the tribological properties of the friction pair are significantly influenced by lubrication modes under PFPE oil lubrication, especially at high temperature. Tribotests show that the friction system exhibited low friction behaviours under PFPE oil due to the excellent thermal stability of PFPE oil. Coefficient of friction (CoF) of the friction system is as super low as 0.029 under PFPE oil.

show abstract

Effect of ZDDP concentration on the thermal film formation on steel, hydrogenated non-doped and Si-doped DLC

Cited by 18 publications

References 52 publications

Reactivity of oil‐soluble IL with silicon surface at elevated temperature

Reactivity of oil‐soluble IL with silicon surface at elevated temperature

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

High temperature solid/liquid lubrication behaviours of DLC films

Contact Info

Product

Resources

About