Tribological Property of Nano-Cu as Additive in Lubricating Oil

The tribological property of nano-Cu as additive in lubricating oil was investigated on a stock-on-ring testing machine. Friction coefficient and wear mass loss were discussed in order to study tribological property. And the worn surfaces were characterized by scanning electronic microscopy(SEM). Then wear and lubricating mechanism were discussed. The results show that the wear and friction properties of nano-Cu as lubricating oil additive are excellent. And when the adding quantity is 0.04% and 0.03%(mass fraction), the friction coefficient and wear mass loss is best, respectively.

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Frictional Performance of an Ionic Liquid/Graphene Composite Additive in Lubricating Oil

NANO ◽

10.1142/s1793292021501113 ◽

2021 ◽

pp. 2150111

Author(s):

Shengli You ◽

Ming Zhou ◽

Mingyue Wang ◽

Xin Chen ◽

Long Jin ◽

...

Keyword(s):

Friction Coefficient ◽

Friction Pair ◽

Testing Machine ◽

Steel Ball ◽

Wear Scar ◽

Wear Testing ◽

Lubricating Oil ◽

Wear Scar Diameter ◽

Base Oil ◽

Frictional Performance

In this study, we used a four-ball friction and wear testing machine to test the tribological properties of [HPy]BF4 ionic liquids (ILs), low-layer graphene (G), and IL and G compounds (IL/G) as lubricant additives at variousconcentrations, loads, and speeds. The morphology of the wear scar was characterized by a white-light interferometer and a scanning electron microscope (SEM). The results showed that the optimal concentrations of IL and G were 0.10[Formula: see text]wt.% and 0.05[Formula: see text]wt.%, respectively. When the IL concentration was 0.10[Formula: see text]wt.%, the friction coefficient and the wear scar diameter (WSD) reduced by approximately 18% and 8%, respectively, compared to the base oil. When the concentration of G was 0.05[Formula: see text]wt.%, the friction coefficient and WSD reduced by approximately 23% and 12%, respectively, compared to the base oil. After adding the optimal concentration of the IL/G composite additive under the same test conditions, the average friction coefficient of the steel ball reduced by approximately 30%, and the average WSD reduced by approximately 18%. IL/G nanoadditives could be easily attached to the pit area on the friction surface of the steel ball, which made the contact surface of the friction pair smoother and the area of the oil film bearing the load larger, compared to those using the base oil. These two combined phenomena promoted synergistic antifriction and antiwear effects, which significantly improved the frictional performance of the base oil.

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Tribological Properties and Self-Repairing Effect of Palygorskite /Copper Nanocomposites as Lubricating Oil Additive

Materials Science Forum ◽

10.4028/www.scientific.net/msf.694.219 ◽

2011 ◽

Vol 694 ◽

pp. 219-223 ◽

Cited By ~ 1

Author(s):

Xue Mei Wu ◽

Yuan Kang Zhou ◽

Lǜ Yang

Keyword(s):

Abrasive Wear ◽

Mass Loss ◽

Friction And Wear ◽

Lubricating Oil ◽

Wear Properties ◽

Lubricant Oil ◽

Repairing Effect ◽

Average Size ◽

Lubricating Oil Additive ◽

Copper Nanocomposites

Palygorskite/copper nanocomposites were prepared in order to study the friction behaviour and self-repairing effect of HT200 tribopair. The friction and wear behaviors of the lubricant oil containing 4wt% nanocomposites were evaluated on an MMU-10G abrasive-wear tester. Results indicated that the average size of nanoparticles is 200nm and nanoparticle disperses homogeneously. The nanocomposites significantly improve the anti-wear performance.Wear mass loss decreases 41.7%and 63.2% compared with nano-palygoeskite and no additive.SEM and EDX examination of worn surfaces show that the incorporation of nano-copper and nano-palygorskite promote the formation of enriched films which play beneficial role for improving the wear properties.

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Effect of different preparation processes on tribological properties of graphene

Nanomaterials and Nanotechnology ◽

10.1177/1847980420946655 ◽

2020 ◽

Vol 10 ◽

pp. 184798042094665

Author(s):

Yong Liu ◽

Yi Dong ◽

Yangang Zhang ◽

Siyuan Liu ◽

Yu Bai

Keyword(s):

Liquid Phase ◽

Friction Coefficient ◽

Tribological Properties ◽

Friction And Wear ◽

Test Methods ◽

Lubricating Oil ◽

Energy Spectrometer ◽

Microscopic Morphology ◽

Lubricating Oil Additive ◽

Worn Surface

Two processes of physical liquid phase stripping and chemical redox reduction were used to obtain graphene sheets. Fourier transform infrared spectroscopy and Raman spectroscopy test methods were used to compare and analyze the structure and disorder of graphene. The obtained graphene was modified with oleic acid and stearic acid. The dispersion stability of graphene as a lubricating oil additive was investigated by natural sedimentation method and spectrophotometry. The tribological properties of the graphene dispersion were investigated by a four-ball friction and wear tester. Scanning electron microscope and energy spectrometer were used to characterize and analyze the microscopic morphology and composition of the worn surface. The results showed that the modified liquid phase stripping graphene demonstrated the best anti-wear and anti-friction properties of the dispersion, the lowest friction coefficient is 0.0677, and the average friction coefficient is reduced by about 26%.

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Effects of Ag-Carried Content in P/Ag Nanocomposites on Tribological Properties of 45 Mild Steel Friction Pairs

Materials Science Forum ◽

10.4028/www.scientific.net/msf.694.17 ◽

2011 ◽

Vol 694 ◽

pp. 17-22 ◽

Cited By ~ 1

Author(s):

Lǜ Yang ◽

Yi Li ◽

Yuan Kang Zhou ◽

Xue Mei Wu

Keyword(s):

Friction Coefficient ◽

Mild Steel ◽

Mass Loss ◽

Tribological Properties ◽

Silver Content ◽

Testing Machine ◽

Lubricant Additive ◽

Wear Properties ◽

Surface Topographies ◽

The One

In this paper, some Ag-carried palygorskite nanocomposites P/Ag were prepared, their silver content were 1.3%, 4.61%, 9.54% separately. To investigate the effects of the silver content on tribological properties of 45 mild steel pairs, the P/Ag carried different Ag content were used as lubricant additive and their tribological properties were tested on the MMU-10G testing machine. The wear mass loss is used to assess the anti-wear properties of different additives. The surface topographies and main elements are analyzed through SEM and EDS after running for 30 hours. The results show that the friction coefficient and the wear mass loss significantly decrease along with the increase of silver content in the P/Ag: the average friction coefficient of the P/Ag with 9.54% silver reduces about 65% as much as the one with 1.3% silver, meanwhile, the wear mass loss decreases 57% likewise. The surfaces after rubbing 30 hours, some kind of auto-restoration films that contains sort of characteristic elements such as O, Si, Mg, Al, Ag etc. are formed on the surfaces. With the help of this kind of films, the anti-wear properties of the friction pairs are finally improved. The factors that cause the improvement of anti-friction properties of the friction pairs lie in the quality and the silver content of the auto-restoration films formed on the surfaces of friction pairs.

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The Dependence of the Friction Coefficient on the Size and Course of Sliding Speed

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.693.305 ◽

2014 ◽

Vol 693 ◽

pp. 305-310 ◽

Cited By ~ 3

Author(s):

Eva Labašová

Keyword(s):

Friction Coefficient ◽

Normal Load ◽

Testing Machine ◽

Current Component ◽

Sliding Speed ◽

Rectangular Shape ◽

Coefficient Increase ◽

The Coefficient Of Friction ◽

Ring Method ◽

Run Up

The coefficient of friction for the bronze material (CuZn25Al6) with insert graphite beds and other bronze material (CuSn12) are investigated in this paper. Friction coefficient was investigated experimentally by the testing machine Tribotestor`89 which uses the principle of the ring on ring method. The external fixed bushing was exposed to the normal load of the same size in all tests. Process of load was increased from level 50 N to 600 N during run up 300 s, after the run up the appropriate level of load was held. The internal bushing performed a rotational movement with constant sliding speed. The value of sliding speed was changed individually for every sample (v = 0.2 (0.3, 0.4) m.s-1). The forth test had a rectangular shape of sliding speed with direct current component 0.3 m.s-1 and the amplitude 0.1 m.s-1 period 300 s, the whole test took 2100 s. The obtained results reveal that friction coefficient increase with the increase of sliding speed.

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Experimental Study on the Tribological Characteristics of Nanometer WS2 Lubricating Oil Additive Based on Engine Oil

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.328-330.203 ◽

2011 ◽

Vol 328-330 ◽

pp. 203-208 ◽

Cited By ~ 1

Author(s):

Cheng Bin Chen ◽

Da Heng Mao ◽

Chen Shi ◽

Yang Liu

Keyword(s):

Raw Materials ◽

Viscosity Index ◽

Engine Oil ◽

Lubricating Oil ◽

Contrast Study ◽

Base Oil ◽

Grinding Conditions ◽

Lubricating Oil Additive ◽

Great Wall ◽

Better Than

Nano-WS2(tungsten disulfide nanoparticles)lubricating oil additive, prepared by the nanometer WS2particulates and semi-synthetic engine base oil as raw materials, was added into Great Wall engine oil with different mass ratio. With a contrast study on these oil samples, the results show that it can improve the extreme pressure, antiwear and viscosity-temperature properties of the engine oil effectively by adding a certain amount of nano-WS2additive, and the optimal concentration is 2wt%. The oil film strength, sintering load and viscosity index of this lubricating oil is respectively 1.35 times, 1.58 times and 1.05 times as that of Great Wall engine oil. In addition, when tested under the grinding conditions of 392 N, 1450 r /min and 30 min, the diameter of worn spot reduces 0.018mm, and the average friction coefficients of friction pairs decrease 16.3%, both of which are lubricated by the oil containing nano-WS2additive. Meanwhile, the experiments testify that the tribological and viscosity-temperature properties of the nano-WS2additive are better than that of the Henkel MoS2additive.

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Effects of Load and Rotate Speed on the Friction of NBR by 45# Steel in Crude Oil Medium

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.230-232.1079 ◽

2011 ◽

Vol 230-232 ◽

pp. 1079-1083

Author(s):

Yi Zhang ◽

Shi Jie Wang ◽

Zhong Feng Guo ◽

Zhong Wei Ren

Keyword(s):

Friction Coefficient ◽

Crude Oil ◽

Constant Temperature ◽

Testing Machine ◽

Butadiene Rubber ◽

Nitrile Butadiene Rubber ◽

Friction Testing ◽

Low Load ◽

Test Result

Select two types of nitrile-butadiene rubber (NBR) which they are different in ingredients, under two types of crude oil medium respectively, the test is carried out on the friction testing machine. The test result shows that under the constant intermediate-low rotate speed and constant temperature, the friction coefficient decreases as the load increases; under the constant intermediate-low load and constant temperature, the friction coefficient increases as the rotate speed increases.

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