scholarly journals The Application of Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribological Behavior Improvement

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 200 ◽  
Author(s):  
Guo ◽  
Peng ◽  
Du ◽  
Shen ◽  
Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Lubricant Additive ◽  
Lubricating Oil ◽  
Liquid Lubricant ◽  
Engine Efficiency ◽  
Oil Additives ◽  
Lubricating Oil Additives ◽  
Ball On Disc

Molybdenum disulfide quantum dots (MoS2 QDs) are a promising lubricant additive for enhanced engine efficiency. In this study, MoS2 QDs were used as lubricating oil additives for ball-on-disc contact and had adequate dispersity in paroline oil, due to their super small particle size (~3 nm). Tribological results indicate that the friction coefficient of paroline oil with 0.3 wt.% MoS2 QDs reached 0.061, much lower than that of pure paroline oil (0.169), which is due to the formation of a stable tribo-film formed by the MoS2, MoO3, FeS, and FeSO4 composite within the wear track. Synergistic lubrication effects of the tribo-film and ball-bearing effect cooperatively resulted in the lowest friction and wear.

scholarly journals Research Progress of Nano Copper Lubricant Additives on Engineering Tribology

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2006
Author(s):  
Junde Guo ◽  
Yingxiang Zhao ◽  
Biao Sun ◽  
Puchao Wang ◽  
Zhijie Wang ◽  
...  
Keyword(s):  
Lubricant Additive ◽  
Friction Reduction ◽  
Research Progress ◽  
Lubricating Oil ◽  
Self Healing ◽  
Boundary Slip ◽  
Copper Particles ◽  
Oil Additives ◽  
Engineering Significance ◽  
Lubricating Oil Additives

Nanoparticles have as characteristics super sliding, extreme pressure, self-healing, etc., which can improve the friction reduction and anti-wear performance of sliding components, when used as lubricating oil additives. Nano-copper particles have a good synergistic effect with other antifriction agents, anti-wear agents, antioxidants and grease additives because of their low shear strength and grain boundary slip effect, showing a better anti-friction and anti-wear effect. However, nanoparticles are prone to conglomerate, and this causes a bottleneck in the application of dispersant for nano-copper in a lubricating oil system. The regulation of nanosized effect and surface properties has great engineering significance in compensating for the precision in manufacturing accuracy. This paper comprehensively reviews the tribological research progress of nano-copper as a lubricant additive, which provides a reference to the application of nano-copper particles as lubricating oil additives on engineering tribology.

Research on Tribological Properties of Serpentine Particles as Lubricating Oil Additives

2011 ◽  
Vol 284-286 ◽  
pp. 1001-1005 ◽  
Author(s):  
Peng Wang ◽  
Jing Lv ◽  
Lian Hai Wang ◽  
Qiang Ma ◽  
Xin He Zhu
Keyword(s):  
Oleic Acid ◽  
Friction And Wear ◽  
Friction Pair ◽  
Volume Ratio ◽  
Lubricating Oil ◽  
Protective Film ◽  
Optimum Dosage ◽  
Oil Additives ◽  
Lubricating Oil Additives ◽  
Friction And Wear Tests

This paper adopts wet method to prepare serpentine particles on the planetary ball mill, executes lipophilic degree tests and friction and wear tests of these particles. The results showed that: 1) as the modification agent, the optimum dosage of oleic acid is when the volume ratio of oleic acid and serpentine particles is 2, and the optimum time of milling (modification) is 24h. 2) 4012 maritime lubricating oil with serpentine particles has obvious anti-wear and friction effect, and the optimum dosage range of serpentine particles is 0.9%-1.0%. According to the outcomes of metallurgical microscope observation and electron microprobe analysis, a conclusion can be drawn: during the process of friction and wear, serpentine particles brought on physical or chemical reactions with the surface of test samples, create a layer of protective film, thus this kind of lubricating oil has filling function to the furrow of friction pair surface, so as to decrease the surface roughness, decrease the degree of friction and wear.

scholarly journals Experimental Analyses of the Additive Effect of TiO2 Nanoparticles on the Tribological Properties of Lubricating Oil

2021 ◽  
Author(s):  
CORINA BIRLEANU ◽  
MARIUS PUSTAN ◽  
MIRCEA CIOAZA ◽  
ANDREEA MOLEA ◽  
FLORIN POPA ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Friction And Wear ◽  
Room Temperature ◽  
Tribological Behavior ◽  
Lubricant Additive ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Wear Volume ◽  
Engine Efficiency ◽  
Base Engine

Abstract Titanium dioxide (TiO2) is a promising lubricant additive for enhanced engine efficiency. In this study, pure base engine oil 10 W-30 was improved with titanium dioxide (TiO2) nanoparticles at different concentrations and experimentally evaluated with the scope of tribological behavior improvement. The tribological tests were performed at ambient temperature as well as at 75°C using a four ball tribometer for 30 minutes. Due to their small particle size (approx. 21 nm), the TiO2 nanoparticles were properly dispersed in oil based on optical microscopy evaluation. The tribological results indicate that the friction coefficient of engine oil with 0.075 wt.% TiO2 reached 0.05 at 75°C, which was much lower that of pure oil (1.20), and at room temperature (23°C), it decreased from 1.8 for pure oil to 0.4 for oil with 0.075 wt.% TiO2 due to the formation of a stable tribofilm formed by the MoS2, MoO3, FeS, and FeSO4 composite within the wear track. The lowest wear volume was measured on samples tested at 75°C for the oil with 0.075 wt.% TiO2. The TiO2 additive lubricant effect on the tribofilm properties led to a decrease in friction and wear at an operating temperature of 75°C. The main objective of the paper is to present the recent progress and, consequently, to develop a comprehensive understanding of the tribological behavior of engine oil mixed with TiO2 nanoparticles.

Tribological Properties of Zirconium Oxide, Spinel and Mullite Nanopowders as Lubricating Oil Additives

2016 ◽  
Vol 721 ◽  
pp. 451-455
Author(s):  
Armands Leitans ◽  
Eriks Palcevskis
Keyword(s):  
Tribological Properties ◽  
Zirconium Oxide ◽  
Friction Pair ◽  
Synthesis Method ◽  
Lubricating Oil ◽  
Nanosized Powders ◽  
Base Oil ◽  
Oil Additives ◽  
Oxide Spinel ◽  
Lubricating Oil Additives

In work investigated effects of zirconium oxide (ZrO2), spinel (MgAl2O4) and mullite (Al6Si2O13) nanosized powders on the base oil tribological properties. The nanosized (30-40nm) powders manufactured by plasma chemical synthesis method. Tribological experiments used on ball-on-disc type tribometer, measured coefficient of friction and determined metalic disc wear. Base oil used selectively purified mineral oil (conform SAE-20 viscosity) without any functional additives. Nanosized powders dispersed in base oil at 0.5; 1.0; 2.0; wt.%. At work cocluded, that the adition nanoparticles in base oil, possible reduced friction pair wear and friction coefficient. As the main results include spinel (MgAl2O4) nanoparticles 0.5 and 1.0 wt. % concentration ability reduced friction coeffiecient value.

Tribological performance of nanoparticles as lubricating oil additives

2016 ◽  
Vol 18 (8) ◽  
Author(s):  
M. Gulzar ◽  
H. H. Masjuki ◽  
M. A. Kalam ◽  
M. Varman ◽  
N. W. M. Zulkifli ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Lubricating Oil ◽  
Oil Additives ◽  
Lubricating Oil Additives

Synthesis and Tribological Properties of S- and P-Free Borate Esters With Different Chain Lengths

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Guangbin Yang ◽  
Zhanming Zhang ◽  
Guihui Li ◽  
Jinfeng Zhang ◽  
Laigui Yu ◽  
...  
Keyword(s):  
Alkyl Chain ◽  
Liquid Paraffin ◽  
Alkyl Chain Length ◽  
Lubricating Oil ◽  
Oil Additives ◽  
Borate Esters ◽  
Lubricating Oil Additives ◽  
Steel Balls ◽  
Chain Lengths ◽  
Antiwear Ability

Three kinds of S- and P-free borate esters containing N with different alkyl chain lengths were prepared by using boric acid, ethanolamine, and alkyl-alcohol as the starting materials. The chemical structure of the products was analyzed by means of Fourier transformation infrared spectrometry, elemental analysis, and so on. The thermal stability of the products was evaluated by thermogravimetric analysis. The tribological properties of the synthesized borate esters as lubricating oil additives in liquid paraffin were evaluated using a four-ball friction and wear tester while the morphologies of the worn scars of the steel balls were observed using a scanning electron microscope. The chemical components on the worn surfaces of the steel balls were analyzed using an X-ray photoelectron spectroscopy. Results show that all the three kinds of synthetic borate esters as additives in liquid paraffin possess good antiwear performance and may be used as promising S- and P-free environmentally acceptable lubricating oil additives. Particularly, borate ester with short alkyl chain length at a low concentration in liquid paraffin was more effective in reducing wear, and the antiwear ability of the additives decreased with increasing alkyl chain length. The antiwear ability of the N-containing borate esters as additives in liquid paraffin might be closely related to the formation of hydrogen bonds via N with a high electronegativity and small atomic radius and the easy permeation of electron-deficient B on the rubbing steel surfaces.

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