The effects of diesel contaminants on tribological performance on sliding steel on steel contacts

Ramkumar, P.; Harvey, Terry J.; Wood, R.J.K.; Nelson, Kenneth; Powrie, H.E.G.

doi:10.1177/1350650111409825

Cited by 31 publications

(18 citation statements)

References 55 publications

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“…These results suggest that the presence of CB in the oil will not necessarily cause severe wear during the tribological tests due to abrasion or mechanical action. Thus, the results presented in this study contradict the concept that suggests abrasion-induced wear is the main mechanism [13,15,17,18,53].…”

Section: Accepted Manuscriptcontrasting

confidence: 97%

“…That is to say although in both tests 1wt% CB was present in oil, the wear behaviour was different. Many studies [13,15,17,18,53] have reported that the increase in wear by soot was related to the abrasive nature of soot. The results presented in this study demonstrated that the tests which were conducted with the same levels of CB particles (1wt%) showed different levels of wear.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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The effect of soot and diesel contamination on wear and friction of engine oil pump

Salehi

Morina

Neville

2017

Tribology International

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The effect of oil contamination and oil degradation on friction and wear of engine oil pump are addressed in this paper. It provides a summary of an experimental study on the effects of oil contamination and oil degradation on tribological performance of a Variable Displacement Vane Pump (VDVP); a particular focus is on the vane-rotor contact. Firstly, a lab-based artificial ageing of fully-formulated engine oil (FFO) with the addition of contaminants such as carbon black (CB) and diesel is conducted. Secondly, the impact of these contaminants on the bulk property of the oil during the ageing process is investigated, using rheometry and Attenuated Total Reflectance/ Fourier Transform Infrared Spectroscopy (ATR/FTIR). Thirdly, the performance of these oils on friction and wear of the vane-rotor contact under boundary lubrication regime is evaluated. The wear mechanism and chemical nature of tribofilms formed in tribological tests are addressed using Scanning Electron Microscopy/Energy Dispersive Xray analysis (SEM/EDX) and Raman spectroscopy. It is found that the consumption of the additives by soot (additive adsorption) in the engine oil during the ageing process has a significant effect on wear of the components. This mechanism has a higher impact on producing high wear than abrasion by soot particles.

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Section: Accepted Manuscriptcontrasting

confidence: 97%

Section: Accepted Manuscriptmentioning

confidence: 99%

The effect of soot and diesel contamination on wear and friction of engine oil pump

Salehi

Morina

Neville

2017

Tribology International

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“…However, abrasive wear was observed on the worn surface. Because BDS can fill the friction pairs and act as a balling bearing, the aggregation of BDS can cause abrasive wear [38,39]. Apart from the spacing and ball bearing effect, the carbon onion-like nanoparticles (NA-BDS-OLA) possibly alleviated the friction shearing through their exfoliating behavior [40], which is in accordance with the results shown in Figure 10.…”

Section: Resultssupporting

confidence: 64%

Novel Carbon Nanoparticles Derived from Biodiesel Soot as Lubricant Additives

Wang

et al. 2019

Nanomaterials

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The objective of this study was to investigate the roles and tribological mechanisms of onion-like carbon nanoparticles derived from biodiesel soot (BDS) when applied in water (H2O) and liquid paraffin (LP). In this study, we prepared nitric acid-treated BDS (NA-BDS) as an additive to H2O and NA-BDS modified with oleylamine (NA-BDS-OLA) as an additive to LP. Raman spectroscopy, field-emission transmission electron microscopy, Fourier transform infrared spectroscopy, and zeta potentiometry were used to characterize the results of the nitric acid treatment and oleylamine modification. The tribological behaviors and corresponding mechanisms of the new onion-like carbon nanoparticles were evaluated using a ball-on-disc reciprocating tribometer, as well as field-emission scanning electron microscopy, three-dimensional laser scanning microscopy, and Raman spectroscopy. The results indicated that the additives NA-BDS and NA-BDS-OLA, which were onion-like carbon nanoparticles with sizes ranging from 35 to 40 nm, enhanced the antiwear and friction reduction properties of H2O and LP, respectively. Through tribo-mechanisms, these types of soot can serve as spacers and ball bearings between the rubbing surfaces. Moreover, exfoliation under a high load as a result of the formation of a graphitic layer facilitates easy shearing.

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“…The post-test analysis indicates that the steel pins are susceptible to corrosive wear and pitting, both of which are tribochemical in nature, which conceivably would increase the charge observed, as tribochemical reactions involve ionic (charged) species. 16…”

Section: Resultsmentioning

confidence: 99%

Factorial study of diesel engine oil contamination effects on steel and ceramic sliding contacts

Ramkumar

Harvey

Wood

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present work investigates the effects of diesel contaminants and their interaction on tribological properties for bearing steel (En31) and ceramic (Si 3 N 4) sliding contacts using a factorial study. The contaminants are soot, sulphuric acid, moisture and oxidation, and each contaminant has three different level of concentration (low, medium and high) in the test matrix. The factorial test matrix consisted of 20 tests, constructed from a quarter fractional factorial test matrix with four points at the medium values for the contaminants. Results from this matrix required six further tests to elucidate aliased pairs of interactions using Bayesian model selection. A pin-on-disc tribometer was used to carry out all the experiments. All tests were carried out under ambient conditions at 5 m/s sliding speed and contact stress of 1.5-2.05 GPa to simulate a valve-train in a diesel engine with fully formulated heavy-duty diesel engine oil used as lubricant. Four different tribological properties were studied. The factorial study showed that charge was influenced by tribocouple material; the silicon nitride discs produced higher charge than steel discs. However, it was opposite for friction; the silicon nitride disc gave lower friction and the pins showed higher friction than their steel counterparts. For wear scar and temperature, soot contaminant was found to be important. The two important interactions were found for the charge response, with the interaction between sulphuric acid and pin material being more important than sulphuric acidoxidation interaction. Similarly to charge, an interaction between sulphuric acid and pin material interaction was found for friction.

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The effects of diesel contaminants on tribological performance on sliding steel on steel contacts

Cited by 31 publications

References 55 publications

The effect of soot and diesel contamination on wear and friction of engine oil pump

The effect of soot and diesel contamination on wear and friction of engine oil pump

Novel Carbon Nanoparticles Derived from Biodiesel Soot as Lubricant Additives

Factorial study of diesel engine oil contamination effects on steel and ceramic sliding contacts

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