Effect of degradation on tribological performance of engine lubricants at elevated temperatures

Heredia-Cancino, J.A.; Ramezani, Maziar; Álvarez-Ramos, M. E.

doi:10.1016/j.triboint.2018.04.015

Cited by 51 publications

(20 citation statements)

References 21 publications

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“…One typical process for DPF regeneration consists of a thermal treatment where the temperature of exhaust gases increase up to 650 o C (approx.) using delayed injections [22].…”

Section: Introductionmentioning

confidence: 99%

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Tormos

Novella

Gómez-Soriano

et al. 2019

Tribology International

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The engine oil contamination by both particulate matter (PM) and fuel is becoming an important problem since strategies to control pollutant emissions in internal combustion engines (ICE) significantly increase their presence in engine oil. As a consequence, the engine oil loses its tribological properties compromising engine lubrication and leading to potential problems in engine such as wear, corrosion, etc. For that reason, the study of the oil degradation and contamination due to these strategies have a special interest to the engine manufacturers and engine oil formulators. In this paper, the engine oil soot content and fuel dilution is analysed under real engine conditions. The study is addressed from two different but complementary points of views. First, on-line measurements at several engine operating conditions are performed in order to further understand how the soot generation correlates with the oil soot content and other derived problems on oil performance. Then, experimental data available after the experimental campaign is used to calibrate a numerical model, based on Computational Fluid Dynamics (CFD), that estimate the amount of soot particles settled in the engine oil. Results show that soot particles are more present in oil when operating high load-speed conditions and during the Diesel Particulate Filter (DPF) regeneration cycles. Regarding the fuel dilution, delayed post-injections are critical since they significantly increase the amount of fuel in the engine oil. Numerical results also show the relationships between the soot particles generated during combustion and the amount of soot in engine oil, giving an enhanced comprehension of soot-in-oil deposition mechanisms.

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“…One typical process for DPF regeneration consists of a thermal treatment where the temperature of exhaust gases increase up to 650 o C (approx.) using delayed injections [22].…”

Section: Introductionmentioning

confidence: 99%

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Tormos

Novella

Gómez-Soriano

et al. 2019

Tribology International

View full text Add to dashboard Cite

show abstract

“…When the temperature increases to 400 °C, the friction coefficient curve fluctuates drastically, with the mean coefficient reaching a maximum of 0.528. This indicates that the oil is completely decomposed into asphaltene, resin, and amorphous carbon [33]. The addition of surfactant has almost no effect on the lubricating performance under the experimental conditions and results in similar friction coefficient values to pure oil.…”

Section: Resultsmentioning

confidence: 92%

Friction Behavior of Silver Perrhenate in Oil as Lubricating Additive for Use at Elevated Temperatures

Wang

Yan

et al. 2019

Materials

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In this study, we use an aqueous solution synthesis method to prepare silver perrhenate powders and suspend them into a poly alpha olefin (PAO) base oil with polyoxyethylene octylphenyl ether. Four ball tests and ball-on-disk reciprocating mode are performed to determine how silver perrhenate performs tribologically as a lubricating additive over a wide range of temperatures. The physical and chemical properties, as well as the lubricating mechanisms of the silver perrhenate additive, are characterized via X-ray diffraction, scanning electron microscope, Fourier transformation infrared spectroscopy, Raman spectrum, and X-ray photoelectron spectroscopy. The four-ball test results demonstrate that the oil added with silver perrhenate additive is more effective than the base oil in reducing friction and improving wear resistance, and provides the best lubricating performance when at a concentration of 0.5 wt%. The reciprocating mode findings indicate that the hybrid lubricant exhibits distinctively better tribological properties than the base oil at high temperatures, and its low shear strength and chemical inertness allow for low friction at elevated temperatures. The resulting silver perrhenate layer that incorporates native superalloy oxides on the worn surface can provide lubrication by serving as a barrier that prevents direct contact between the rubbing surfaces at elevated temperatures.

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“…In consequence, a study by Mello had considered a part of this issue by testing the stability of a CuO nanolubricant dispersed by toluene and oleic acid, before and after the tribological testing [38]. One more vague issue that needs to be treated is the effect of degradation on the engine lubricant life span, which is observed under specific testing conditions [54,55].…”

Section: Preparation Methods Of Nanolubricantsmentioning

confidence: 99%

Recent Advances in Preparation and Testing Methods of Engine-Based Nanolubricants: A State-of-the-Art Review

et al. 2021

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Reducing power losses in engines is considered a key parameter of their efficiency improvement. Nanotechnology, as an interface technology, is considered one of the most promising strategies for this purpose. As a consumable liquid, researchers have studied nanolubricants through the last decade as potential engine oil. Nanolubricants were shown to cause a considerable reduction in the engine frictional and thermal losses, and fuel consumption as well. Despite that, numerous drawbacks regarding the quality of the processed nanolubricants were discerned. This includes the dispersion stability of these fluids and the lack of actual engine experiments. It has been shown that the selection criteria of nanoparticles to be used as lubricant additives for internal combustion engines is considered a complex process. Many factors have to be considered to investigate and follow up with their characteristics. The selection methodology includes tribological and rheological behaviours, thermal stability, dispersion stability, as well as engine performance. Through the last decade, studies on nanolubricants related to internal combustion engines focused only on one to three of these factors, with little concern towards the other factors that would have a considerable effect on their final behaviour. In this review study, recent works concerning nanolubricants are discussed and summarized. A complete image of the designing parameters for this approach is presented, to afford an effective product as engine lubricant.

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Effect of degradation on tribological performance of engine lubricants at elevated temperatures

Cited by 51 publications

References 21 publications

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Study of the influence of emission control strategies on the soot content and fuel dilution in engine oil

Friction Behavior of Silver Perrhenate in Oil as Lubricating Additive for Use at Elevated Temperatures

Recent Advances in Preparation and Testing Methods of Engine-Based Nanolubricants: A State-of-the-Art Review

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