scholarly journals Tribological Behavior of Hydraulic Oils Under Different Motion Modes

2021 ◽  
Vol 233 ◽  
pp. 04021
Author(s):  
An Haizhen ◽  
Chen Li ◽  
Zhen Penghou ◽  
Liu Min
Keyword(s):  
Tribological Properties ◽  
Hydraulic System ◽  
Tribological Behavior ◽  
Test Methods ◽  
Lubricating Oil ◽  
Extreme Pressure ◽  
Wear Performance ◽  
Motion Modes ◽  
Test Parameters ◽  
Selection Of

In order to study the tribological properties of different hydraulic oils under different motion modes, four-ball tester and block-on-ring tester were used to optimize the test parameters and evaluate performance of commercial hydraulic oils. The results showed that the optimized test methods under the form of point and line motion modes can better evaluate the extreme pressure and anti-wear performance of hydraulic oi. There was a negatively correlation between extreme pressure and anti-wear performance; this method can provide a basis for the reasonable selection of lubricating oil in hydraulic system.

Recent Development in Friction Test Methods and Apparatus of Polymer Composites

2011 ◽  
Vol 301-303 ◽  
pp. 494-496
Author(s):  
Ye Tian ◽  
Mei Jia Guo ◽  
Jian She Zhang ◽  
Yu Cheng Li ◽  
Dong Xing Zhang ◽  
...  
Keyword(s):  
Relative Motion ◽  
Friction And Wear ◽  
Epoxy Composite ◽  
Test Methods ◽  
Friction Test Methods ◽  
Friction Contact ◽  
Friction Test ◽  
Wear Performance ◽  
Motion Modes ◽  
Friction Method

Friction and wear performance is very complex. There are many tests methods and tests apparatus. In this paper, some basic of friction contact types and relative motion modes were introduced. Then some important friction tests methods and apparatus for composites were reviewed concisely. At last, a new friction method and equipment used in Kevlar/epoxy composite were proposed.

scholarly journals Tribological properties of synthetic base oil containing polyhedral oligomeric silsesquioxane grafted graphene oxide

RSC Advances ◽  
2018 ◽  
Vol 8 (42) ◽  
pp. 23606-23614 ◽  
Author(s):  
Bo Yu ◽  
Kai Wang ◽  
Yiwen Hu ◽  
Feng Nan ◽  
Jibin Pu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Lubricating Oil ◽  
Wear Performance ◽  
Base Oil ◽  
Oligomeric Silsesquioxane

The dispersion of graphene-based materials in lubricating oil is a prerequisite for improving its friction and wear performance.

scholarly journals RAPESEED OIL VERSUS SOYBEAN OIL – RHEOLOGICAL AND TRIBOLOGICAL PROPERTIES

2017 ◽  
Author(s):  
I. Radulescu ◽  
A.V. Radulescu ◽  
C. Georgescu ◽  
L. Deleanu
Keyword(s):  
Shear Rate ◽  
Soybean Oil ◽  
Tribological Properties ◽  
Rapeseed Oil ◽  
Tribological Behavior ◽  
Test Type ◽  
Tribological Tests ◽  
Test Parameters ◽  
Plate Geometry

The purpose of this paper is a comparison between rapeseed oil and soybean oil, regarding their rheological and tribological properties. Tests were performed on a Brookfield viscometer with cone-plate geometry, having the following test parameters: test type – shear rate imposed, shear rate (100...2000 s–1), temperature values between 20 °C and 75 °C. In parallel, there were proceed tribological tests on a four ball machine, for three speeds (1200, 1500 and 1800 rpm). The results of the tests highlight the better rheologial and tribological behavior of the rapeseed oil, thus it could be recommended in tribological applications.

Tribological Properties of Nano-Sized Molybdenum Disulfide Particles

2005 ◽  
Author(s):  
Xianguo Hu ◽  
Yucheng Wu ◽  
Guangcheng Yuan ◽  
Peng Huang ◽  
Hefeng Jing
Keyword(s):  
Friction Coefficient ◽  
Metal Surface ◽  
Tribological Properties ◽  
Surface Composition ◽  
Load Capacity ◽  
Nano Particles ◽  
Lubricating Oil ◽  
Protective Film ◽  
Extreme Pressure ◽  
Sem Images

This paper summarizes the tribological properties of MoS2 nano-particles with about 30 nm under different frictional conditions. By four-ball tribometer, the results showed that as the nano-MoS2 content is over 0.5 wt% the extreme pressure of lubricating oil is higher than to 30% than that of lubricating oil with same content of common MoS2. The nano-MoS2 particles can decrease the friction coefficient of lubricating oil obviously. However the results showed that their friction reductions have not obvious difference by the ring-on-block tribometer. The analyses of surface composition conducted by XPS and SEM images showed that the nanoparticles form a protective film (WO3) allowing an increase in the load capacity of rubbed pairs. The main advantage of the nanoparticles is ascribed to the release and furnishing of the nanoparticles from the valley onto the rubbing metal surface and their confinement at the interface.

scholarly journals Effect of different preparation processes on tribological properties of graphene

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%.

scholarly journals Preparation and Tribological Properties of WS2 Hexagonal Nanoplates and Nanoflowers

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 840 ◽  
Author(s):  
Xianghua Zhang ◽  
Jiangtao Wang ◽  
Hongxiang Xu ◽  
Heng Tan ◽  
Xia Ye
Keyword(s):  
Electron Microscopy ◽  
Tribological Properties ◽  
Tribological Performance ◽  
Lubricating Oil ◽  
X Ray Diffraction ◽  
Wear Performance ◽  
Paraffin Oil ◽  
Transmission Electron ◽  
Special Morphology ◽  
Hexagonal Nanoplates

This paper presents the facile synthesis of two different morphologies of WS2 nanomaterials—WS2 hexagonal nanoplates and nanoflowers—by a sulfurization reaction. The phases and morphology of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The tribological performance of the two kinds of WS2 nanomaterials as additives in paraffin oil were measured using a UMT (Universal Mechanical Tester)-2 tribotester. The results demonstrated that the friction and wear performance of paraffin oil can be greatly improved with the addition of WS2 nanomaterials, and that the morphology and content of WS2 nanomaterials have a significant effect on the tribological properties of paraffin oil. The tribological performance of lubricating oil was best when the concentration of the WS2 nanomaterial additive was 0.5 wt %. Moreover, the paraffin oil with added WS2 nanoflowers exhibited better tribological properties than paraffin oil with added WS2 hexagonal nanoplates. The superior tribological properties of WS2 nanoflowers can be attributed to their special morphology, which contributes to the formation of a uniform tribo-film during the sliding process.

Tribological Performance of AlN Nanoparticles as Lubricating Oil Additive

2011 ◽  
Vol 366 ◽  
pp. 238-242
Author(s):  
Heng Wang ◽  
Yu Min Wang
Keyword(s):  
Tribological Performance ◽  
Lubricating Oil ◽  
Test Machine ◽  
Extreme Pressure ◽  
Fatigue Wear ◽  
Wear Performance ◽  
Base Oil ◽  
Long Time ◽  
Lubricating Oil Additive ◽  
Worn Surface

By using Four-ball test machine, the anti-wear and extreme pressure performance of the lubricating oil that contain the ceramics nanoparticles additives were investigated. With the help of scanning electron microscopy (SEM), the worn surface is observed, and its tribological performance is studied. The experimental results show that nanoparticles additives can effectively improve extreme pressure and anti-wear performance of the lubricating oil, and the optimal concentration of it in the base oil is 3 wt%. With ZDDP additive contrast experiment show that under low-load and long time conditions, ZDDP additive is far inferior to nanoparticles additives, and containing AlN nanoparticles additives lubricating oil mainly happen Fatigue wear and scratch.

scholarly journals Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Kodanda Rama Rao Chebattina ◽  
V. Srinivas ◽  
N. Mohan Rao
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Ball Milling ◽  
Multiwalled Carbon Nanotubes ◽  
Tribological Properties ◽  
Extreme Pressure ◽  
Multiwalled Carbon ◽  
Pristine Mwcnts ◽  
Gear Oil ◽  
The Stability

The aim of the paper is to investigate the effect of size of multiwalled carbon nanotubes (MWCNTs) as additives for dispersion in gear oil to improve the tribological properties. Since long pristine MWCNTs tend to form clusters compromising dispersion stability, they are mildly processed in a ball mill to shorten the length and stabilized with a surfactant before dispersing in lubricant. Investigations are made to assess the effect of ball milling on the size and structure of MWCNTs using electron microscopy and Raman spectroscopy. The long and shortened MWCNTs are dispersed in EP 140 gear oil in 0.5% weight. The stability of the dispersed multiwalled carbon nanotubes is evaluated using light scattering techniques. The antiwear, antifriction, and extreme pressure properties of test oils are evaluated on a four-ball wear tester. It is found that ball milling of MWCNTs has a strong effect on the stability and tribological properties of the lubricant. From Raman spectroscopy, it is found that ball milling time of up to 10 hours did not produce any defects on the surface of MWCNTs. The stability of the lubricant and the antiwear, antifriction, and extreme pressure properties have improved significantly with dispersion shortened MWCNTs. Ball milling for longer periods produces defects on the surface of MWCNTs reducing their advantage as oil additives.

scholarly journals Comparison of Two Intergranular Corrosion Tests on EN AW-6016 Sheet Material

2021 ◽  
Vol 11 (11) ◽  
pp. 5294
Author(s):  
Peer Decker ◽  
Ines Zerbin ◽  
Luisa Marzoli ◽  
Marcel Rosefort
Keyword(s):  
Optical Microscopy ◽  
Intergranular Corrosion ◽  
Sheet Material ◽  
Test Methods ◽  
Standard Test ◽  
Corrosion Depth ◽  
Corrosion Tests ◽  
Automotive Company ◽  
Test Parameters

Two different intergranular corrosion tests were performed on EN AW-6016 sheet material, an ISO 11846:1995-based test with varying solution amounts and acid concentrations, and a standard test of an automotive company (PV1113, VW-Audi). The average intergranular corrosion depth was determined via optical microscopy. The differences in the intergranular corrosion depths were then discussed with regard to the applicability and quality of the two different test methods. The influence of varying test parameters for ISO 11846:1995 was discussed as well. The determined IGC depths were found to be strongly dependent on the testing parameters, which will therefore have a pronounced influence on the determined IGC susceptibility of a material. In general, ISO 11846:1995 tests resulted in a significantly lower corrosion speed, and the corrosive attack was found to be primarily along grain boundaries.

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