Tribological properties of nano-sized ZrO2 ceramic particles in automotive lubricants

Tóth, Álmos Dávid; Szabó, Ádám István; Kuti, Rajmund

doi:10.5937/fme2101036t

Cited by 16 publications

(20 citation statements)

References 17 publications

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“…This plastic deformation offered positive tribological properties to the tribological system, it increased the area of the contacting surfaces resulting in a lower surface pressure of the tribological system. Compared with previous experiments with the same tribological methodology [18,26] this kind of plastic deformation could not be observed in the presence of another nanoceramic doped lubricant samples.…”

Section: Elementcontrasting

confidence: 66%

“…The ball specimen was moved on the flat surface of the disc with a 1 mm stroke and 50 Hz frequency oscillation movement pattern. Both the specimens and the lubricant were heated up to 100 • C temperature separately; 50 N loading force was applied between the surfaces for 30 s and then increased to 100 N for 2 h [18]. The applied testing machine with the realized oil circuit is presented in Figure 4.…”

Section: Investigation Methods and Materialsmentioning

confidence: 99%

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Tribological Properties of the Nanoscale Spherical Y2O3 Particles as Lubricant Additives in Automotive Application

et al. 2022

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The continuous tribological development of engine lubricants is becoming more and more vital due to its fuel efficiency improvement and lifetime increasing potential. The antiwear additives play a high role in the lubricants to protect the contacting surfaces even in the presence of thinner oil film. Nanoscale spherical particles in the lubricant may increase the necessary protecting effect. This paper presents the results of the experimental tribological investigation of nanoscale spherical Y2O3 (yttria) ceramic particles as an engine lubricant additive. The ball-on-disc tribological measurements have revealed an optimum concentration at 0.5 wt% with about 45% wear scar diameter and 90% wear volume decrease, compared to the reference, neat Group III base oil. The high-magnitude SEM analysis revealed the working mechanisms of yttria: the particles collected in the roughness valleys resulted in a smoother contacting surface, they were tribo-sintered and they have also caused slight plastic deformation of the outer layer of the metallic surface.

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Section: Elementcontrasting

confidence: 66%

Section: Investigation Methods and Materialsmentioning

confidence: 99%

Tribological Properties of the Nanoscale Spherical Y2O3 Particles as Lubricant Additives in Automotive Application

et al. 2022

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“…The nanolubricant of ZnO succeeded in forming a tribo-film with adequate coverage alongside the contacted areas of the sliding pairs. In a recent study by Tóth [103], the formation of a tribo-film had been verified by SEM/EDX analyses. A considerable number of ZrO nanoparticles formed a cluster on the surface grooves, as shown in Figure 12.…”

Section: Tribological Performance Of Nanolubricantsmentioning

confidence: 88%

“…In a recent study by Tóth [103], the formation of a tribo-film had been verified by SEM/EDX analyses. A considerable number of ZrO 2 nanoparticles formed a cluster on the surface grooves, as shown in Figure 12.…”

Section: Tribological Performance Of Nanolubricantsmentioning

confidence: 88%

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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“…In the Department of Internal Combustion Engines and Propulsion Technology, such tests are used for various oil qualification, oil comparison tests, and the effects of oil additives and contaminants. These tests are performed on an Optimol SRV®5 tribometer [14]. In the last years, more than 500 new, used, aged and contaminated oil samples have been compared with this test, and the results showed a significant difference between different new (unused, uncontaminated, unaged) oils as well as between differently contaminated and used oils in terms of both friction and wear.…”

Section: Figure 1 Ball-on-disc Specimensmentioning

confidence: 99%

Development of comparative investigation method for timing chain wear analysis using oscillating tribometer

Paulovics

Kuti

Rohde-Brandenburger

et al. 2021

Acta Tech. Jaurinensis

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This paper presents the development of a test procedure to investigate timing chain components under abrasive stress on a tribometer. Engine developers use cost and time expensive engine dynamometer tests to investigate timing chain life expectancy under different conditions. Tribometer tests are fast and cost effective, but these use standardized specimen material and geometry that greatly differ from the original tribological system of the timing chain. Manufacturing specimens from the original chain material using the original technology is complicated; surface quality and hardness properties cannot be guaranteed. The aim of research was to develop a test method for rapid and cost-effective comparison of engine lubricants, timing chain materials or coatings, as well as to assess the wear resistance of the chain to contaminants. Various uncontaminated and carbon black blended lubricants were compared using standard-based ball-on-disc tribometer tests to tribometer tests using actual timing chain components (bush-on-pin test) of a Diesel engine. Lubricants were ranked in terms of coefficient of friction and wear. Results showed that bush-on-pin tests were comparably suitable for testing lubricants when evaluated against standard ball-on-disc tribometer tests.

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Tribological properties of nano-sized ZrO2 ceramic particles in automotive lubricants

Cited by 16 publications

References 17 publications

Tribological Properties of the Nanoscale Spherical Y2O3 Particles as Lubricant Additives in Automotive Application

Tribological Properties of the Nanoscale Spherical Y2O3 Particles as Lubricant Additives in Automotive Application

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

Development of comparative investigation method for timing chain wear analysis using oscillating tribometer

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