scholarly journals Tribological investigation of applicability of nano-sized cupricoxide (CuO) ceramic material in automotive vehicles

2021 ◽  
Vol 49 (2) ◽  
pp. 335-343
Author(s):  
Álmos Tóth ◽  
Á.I. Szabó ◽  
R. Kuti ◽  
J. Rohde-Brandenburger
Keyword(s):  
Internal Combustion Engines ◽  
Protective Film ◽  
Combustion Engines ◽  
Wear Scar Diameter ◽  
Friction Modifier ◽  
Working Mechanism ◽  
Base Oil ◽  
Copper Material ◽  
Group 3 ◽  
Ball On Disc

Due to the continuously increasing requirements of the internal combustion engines, the lubricants and their additives have to be further developed. One possible solution is the application of ceramic nanoparticles as friction modifier and wear decreaser additives. This paper presents the tribological investigation of cupricoxide (CuO) nanoparticle mixed in neat Group 3 base oil. To analyse its properties, simplified ball-on-disc friction experiments were carried out in the tribological laboratory in the Széchenyi István University in Győr, Hungary. The arisen wear scars were analysed with different, highresolution microscopes to understand the working mechanism of the nanoparticles. The results have indicated an optimum concentration of nanoparticles at 0.5wt% where both the average friction coefficient and the wear scar diameter were reduced by 15%. The microscopical investigation revealed the reduction of copper material from the CuO material, and it has mended to the rubbing surface forming a protective film on the metal surface.

Efficiency of Application of the Friction Modifier in Internal Combustion Engines by the Results of Field Tests

1980 ◽  
Vol 41 (5) ◽  
pp. 641-646
Author(s):  
J Padgurskas ◽  
◽  
E Jaškauskas ◽  
R Rukuiža ◽  
I Kavaliova ◽  
...  
Keyword(s):  
Internal Combustion Engines ◽  
Field Tests ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Friction Modifier

scholarly journals Graphene Oxide Nanosheets as Effective Friction Modifier for Oil Lubricant: Materials, Methods, and Tribological Results

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Adolfo Senatore ◽  
Vincenzo D'Agostino ◽  
Vincenzo Petrone ◽  
Paolo Ciambelli ◽  
Maria Sarno
Keyword(s):  
Graphene Oxide ◽  
Wide Spectrum ◽  
Frictional Coefficient ◽  
Mineral Oil ◽  
Friction Reduction ◽  
Protective Film ◽  
Graphene Oxide Nanosheets ◽  
Tribological Behaviour ◽  
Friction Modifier ◽  
Base Oil

The tribological behaviour of graphene oxide nanosheets in mineral oil was investigated under a wide spectrum of conditions, from boundary and mixed lubrication to elastohydrodynamic regimes. A ball-on-disc setup tribometer has been used to verify the friction reduction due to nanosheets prepared by a modified Hummers method and dispersed in mineral oil. Their good friction and antiwear properties may possibly be attributed to their small structure and extremely thin laminated structure, which offer lower shear stress and prevent interaction between metal interfaces. Furthermore, the results clearly prove that graphene platelets in oil easily form protective film to prevent the direct contact between steel surfaces and, thereby, improve the frictional behaviour of the base oil. This evidence is also related to the frictional coefficient trend in boundary regime.

scholarly journals Influence of structural factors on the tribological performance of organic friction modifiers

Friction ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 380-400
Author(s):  
Febin Cyriac ◽  
Xin Yi Tee ◽  
Sendhil K. Poornachary ◽  
Pui Shan Chow
Keyword(s):  
Metal Surface ◽  
Internal Combustion Engines ◽  
Chemical Reactivity ◽  
Friction Reduction ◽  
Composition Analysis ◽  
Protective Film ◽  
Structural Factors ◽  
Friction Modifiers ◽  
Base Oil ◽  
Lubrication Performance

AbstractThe influence of structural factors on the lubrication performance of organic friction modifiers (OFMs) formulated in Group V (polyol ester oil) base oil was studied using a ball-on-disk tribometer. The results show that OFMs can mitigate friction under heavy loads, low sliding speeds, and high temperatures. These conditions are commonly encountered in internal-combustion engines between cylinder liners and piston rings. The reduction in friction is ascribed to the boundary lubrication film containing the OFM. The chemical composition analysis of the metal disk surface using energy dispersive X-ray spectroscopy (EDS) confirmed the presence of a protective film of OFM on the wear track, albeit inconsistently deposited. Although the adsorption of the OFM on the metal surface was observed to be dependent on the chemical reactivity of the functional groups, levels of unsaturation, and hydrocarbon chain length of the OFM, the frictional performance was not always directly correlated with the surface coverage and tribofilm thickness. This implies that the friction reduction mechanism can involve other localized processes at the interface between the metal surface and lubricant oil. The occasional variation in friction observed for these OFMs can be attributed to the stability and durability of the boundary film formed during the rubbing phase.

scholarly journals Preparation and Tribological Properties of Carbon-Coated WS2 Nanosheets

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2835 ◽  
Author(s):  
Zheng Li ◽  
Fanshan Meng ◽  
Haohao Ding ◽  
Wenjian Wang ◽  
Qiyue Liu
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Hydrothermal Reaction ◽  
Matrix Material ◽  
Lubricant Additive ◽  
Wear Scar ◽  
Protective Film ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
Carbon Coated

WS2-C is produced from a hydrothermal reaction, in which WS2 nano-sheets are coated with carbon, using glucose as the carbon source. In order to investigate the tribological properties of WS2-C as a lubricant additive, WS2-C was modified by surfactant Span80, and friction tests were carried out on an MRS-10A four-ball friction and wear tester. The results show that Span80 can promote the dispersibility of WS2-C effectively in base oil. Adding an appropriate concentration of WS2-C can improve the anti-wear and anti-friction performance of the base oil. The friction coefficient reached its lowest point upon adding 0.1 wt % WS2-C, reduced by 16.7% compared to the base oil. Meanwhile, the wear scar diameter reached its minimum with 0.15 wt % WS2, decreasing by 26.45%. Moreover, at this concentration, the depth and width of the groove and the surface roughness on the wear scar achieved their minimum. It is concluded that WS2-C dispersed in oil could enter friction pairs to avoid their direct contact, thereby effectively reducing friction and wear. At the same time, WS2-C reacts with the friction matrix material to form a protective film, composed of C, Fe2O3, FeSO4, WO3, and WS2, repairing the worn surface.

DIESEL ENGINE OPERATION IN USE OF FUEL WITH ADDITIVES

2018 ◽  
pp. 18-24
Author(s):  
Petar Kazakov ◽  
Atanas Iliev ◽  
Emil Marinov
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Combustion Engines ◽  
Engine Operation ◽  
Factors Affecting ◽  
Operating Modes ◽  
Positive Effects

Over the decades, more attention has been paid to emissions from the means of transport and the use of different fuels and combustion fuels for the operation of internal combustion engines than on fuel consumption. This, in turn, enables research into products that are said to reduce fuel consumption. The report summarizes four studies of fuel-related innovation products. The studies covered by this report are conducted with diesel fuel and usually contain diesel fuel and three additives for it. Manufacturers of additives are based on already existing studies showing a 10-30% reduction in fuel consumption. Comparative experimental studies related to the use of commercially available diesel fuel with and without the use of additives have been performed in laboratory conditions. The studies were carried out on a stationary diesel engine СМД-17КН equipped with brake КИ1368В. Repeated results were recorded, but they did not confirm the significant positive effect of additives on specific fuel consumption. In some cases, the factors affecting errors in this type of research on the effectiveness of fuel additives for commercial purposes are considered. The reasons for the positive effects of such use of additives in certain engine operating modes are also clarified.

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