Tribological Investigation of Nanographite Platelets as Additive in Anti-Wear Lubricant: A Top-Down Approach

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Flavio A. C. Vidal ◽  
Antonio F. Ávila
Keyword(s):  
Friction Coefficient ◽  
Friction Reduction ◽  
Wear Properties ◽  
Top Down ◽  
Base Oil ◽  
Graphene Layers ◽  
Sliding Mechanism ◽  
Wear And Friction ◽  
Different Types ◽  
Mineral Base

A top-down approach is employed to investigate the tribological effect of adding nanographite platelets (NGPs) to mineral base oil (MBO). The performance of the NGP-modified MBO was evaluated by examining the friction and anti-wear properties. Four different types of NGPs produced by two different processes were employed. The optimal NGP-modified MBO attained a significant wear and friction reduction when compared with the MBO without NGPs. The process used to exfoliate the graphite nanoplatelet samples provided better wear properties because of the graphene layers' smoother sliding mechanism. Graphene layers seeped inside the groove marks to keep the friction coefficient low.

scholarly journals Tribology Properties of Synthesized Multiscale Lamellar WS2 and Their Synergistic Effect with Anti-Wear Agent ZDDP

2019 ◽  
Vol 10 (1) ◽  
pp. 115 ◽  
Author(s):  
Na Wu ◽  
Ningning Hu ◽  
Jinhe Wu ◽  
Gongbo Zhou
Keyword(s):  
Friction Coefficient ◽  
Synergistic Effect ◽  
Solid Phase ◽  
Friction Reduction ◽  
Lubricating Oil ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Wear Properties ◽  
Base Oil ◽  
Electron Probe Micro Analyzer

The microscale/nanoscale lamellar-structure WS2 particles with sizes of 2 µm and 500 nm were synthesized by solid-phase reaction method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The synergies between microscale/nanoscale WS2 particles and ZDDP as lubricating oil additives was evaluated by means of UMT-2 tribometer at room temperature. The wear scars were examined with SEM and electron-probe micro-analyzer (EPMA). The results show that the anti-wear properties were improved and the friction coefficient was greatly decreased with the simultaneous addition of WS2 particles and ZDDP, and the largest reduction of friction coefficient was 47.2% compared with that in base oil. Moreover, the presence of ZDDP additive in the lubricant further enhances the friction-reduction and anti-wear effect of microscale/nanoscale WS2. This confirms that there is a synergistic effect between WS2 particles and ZDDP.

scholarly journals Improving the lubrication and anti-corrosion performance of polyurea grease via ingredient optimization

Friction ◽  
2020 ◽  
Author(s):  
Guanlin Ren ◽  
Xiaowen Sun ◽  
Wen Li ◽  
Hao Li ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Performance Characteristics ◽  
Friction Reduction ◽  
Chemical Components ◽  
Load Carrying Capacity ◽  
Wear Properties ◽  
Base Oil ◽  
Lubrication Film ◽  
Load Carrying ◽  
Polyurea Grease ◽  
Organic Amines

Abstract Thickener formulation plays a significant role in the performance characteristics of grease. The polyurea greases (PUGs) were synthesized using mineral oil (500SN) as the base oil, and by regulating the reaction of diphenylmethane diisocyanate (MDI) and different organic amines. The as-prepared PUGs from the reaction of MDI and cyclohexylamine/p-toluidine exhibit the optimum physicochemical and friction-wear properties, confirming that the regulation of thickener formulation can improve the performance characteristics of grease, including friction reduction, wear, corrosion resistance, and load-carrying capacity. The anticorrosion and lubrication properties of as-prepared PUGs depend on good sealing functions and a boundary lubrication film (synergy of grease-film and tribo-chemical reaction film), as well as their chemical components and structure.

Effect of Ultrasonic Vibration on the Friction and Wear Properties of GCr15/45# Steel Frictional Pairs Lubricated by n-Al2O3 Additives

2012 ◽  
Vol 538-541 ◽  
pp. 1920-1923
Author(s):  
Yu Lin Qiao ◽  
Shan Lin Yang ◽  
Yan Zang ◽  
Xin Yu Dong ◽  
Qing Sheng Cui
Keyword(s):  
Friction Coefficient ◽  
Ultrasonic Vibration ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Wear Scar ◽  
Friction Reduction ◽  
Wear Volume ◽  
Wear Properties ◽  
Friction And Wear Properties

The friction and wear properties of GCr15/45# steel frictional pairs lubricated by n- Al2O3 additives under ultrasonic vibration or not were studied. The scanning electron microscope(SEM), X-ray photoelectron spectroscopy(XPS) and energy dispersive spectrometer (EDS) were carried out to analyse the wear scar surface. The effect mechanism of ultrasonic vibration on friction pairs was discussed. The results indicated that ultrasonic vibration could decrease the friction and wear of GCr15/45# friction pairs, when the content of n-Al2O3 was 0.5wt%, the effect of ultrasonic vibration on friction pairs was most obvious. The friction coefficient, wear volume and wear scar depth under ultrasonic vibration decreased 10%, 34% and 13%, respectively. The friction reduction and anti-wear mechanism of n-Al2O3 was single “micro ball bearing” without ultrasonic vibration, and it changed to “micro ball bearing” and adsorption penetration film with ultrasonic vibration, so the friction coefficient and wear volume was reduced.

Research on Ultrafine PTFE Particles with Grease Tribological Properties

2011 ◽  
Vol 194-196 ◽  
pp. 454-457
Author(s):  
Zhen Jiang Ma ◽  
Ji Hui Yin ◽  
Yang Jiang
Keyword(s):  
Friction And Wear ◽  
Friction Reduction ◽  
Frictional Surface ◽  
Wear Properties ◽  
Lubricating Grease ◽  
Particle Layer ◽  
Wear And Friction ◽  
Friction And Wear Properties ◽  
Steel Balls ◽  
Worn Surface

This article presents a research on friction and wear properties of titanium composite lubricating grease containing ultrafine PTFE particles by using scanning electron microscopy to observe surface morphology of the worn steel balls and EDS to analysis the main elements in the worn surface of steel ball. The results show that the compound titanium grease with 3% ultrafine PTFE has the best wear and friction reduction properties. Its friction coefficient decrease about 25.5%, the diameter of wear scar decrease about 23.2%. The appropriate amount of PTFE particles go into the frictional surface with the grease, form the PTFE particle layer on the frictional surface, which reduces the direct contact of metal to metal, effectively reduces the friction and wear.

Wear Characterization of Aluminum Lubricated with Palm Olein at Different Normal Load

2014 ◽  
Vol 554 ◽  
pp. 401-405 ◽  
Author(s):  
Samion Syahrullail ◽  
Ahmad Mohd Azmi ◽  
Norzahir Sapawe ◽  
Amir Khalid
Keyword(s):  
Friction Coefficient ◽  
Palm Olein ◽  
Normal Load ◽  
Pure Aluminum ◽  
Experimental Conditions ◽  
Sliding Mechanism ◽  
Different Types ◽  
Pin On Disk ◽  
Wear Characterization

The pin-on-disk tester is a method used for investigating wear. The sliding mechanism between the pin and the disc experimentally creates wear. In this paper, the wear characteristics of an aluminium pin sliding on an SKD11 disc lubricated with double fraction palm olein were investigated. The pin was made from pure aluminum A1100. The results were compared with those of tests in which the disc was lubricated with commercial hydraulic oil. In both sets of experimental conditions, the normal load varied from 4 to 10 kg. Rotational speed was set to 1200 rpm. From this study, it was found that different types of lubricant affect the wear progression and friction coefficient during a sliding movement. The wear progression and friction coefficient depend also on the load applied, surface roughness, pressure applied and contact surface area.

Anti-Wear and Friction-Reducing Behavior of Nano-ZrO2 Additive

2009 ◽  
Vol 79-82 ◽  
pp. 605-608 ◽  
Author(s):  
Fei Fei Zhang ◽  
Shao Hua Zheng ◽  
Yan Sheng Yin ◽  
Bin Liu
Keyword(s):  
Electron Microscopy ◽  
Protective Layer ◽  
Wear Test ◽  
Friction Reduction ◽  
Ring Test ◽  
Test Machine ◽  
Base Oil ◽  
Transmission Electron ◽  
Wear And Friction ◽  
Before And After

Nano-ZrO2 particles were modified by KH-570 (γ-methacryloxypropyltrimethoxysilane). The nano-ZrO2 before and after modified were characterized by UV-VIS spectrophotometer and transmission electron microscopy (TEM). The anti-wear and friction reduction properties of nano-ZrO2 used as additive in lubrication were analyzed by friction and wear test machine of MMU-10G. The results show that the polarity of nano-ZrO2 after modified is changed, the surface free energy is reduced, and both the dispersity and stability of the modified nano-ZrO2 in organic media are improved. The modified nano-ZrO2 can increase the anti-wear and friction reduction properties of the base oil. Lubrications containing 0.10wt% and 0.05wt% nano-ZrO2 have the best tribological properties in the four-ball test and the thrust-ring test, respectively. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) was used to analyze the protective layer formed on the rubbed surface, and Zr elements were found on the rubbed surface.

Effect of Ultrasonic Vibration on Friction and Wear Properties of GCr15/45# Steel Frictional Pairs under Oil Lubrication

2011 ◽  
Vol 295-297 ◽  
pp. 2102-2105 ◽  
Author(s):  
Yu Lin Qiao ◽  
Shan Lin Yang ◽  
Yan Zang ◽  
Dong Wang
Keyword(s):  
Friction Coefficient ◽  
Ultrasonic Vibration ◽  
Friction And Wear ◽  
Friction Reduction ◽  
Wear Volume ◽  
Oil Lubrication ◽  
Wear Properties ◽  
Friction And Wear Properties ◽  
Surface Morphologies ◽  
Scanning Electron

Ultrasonic vibration friction and wear experiments were carried out by MFT-R4000 reciprocating friction and wear tester bonded with ultrasonic device. The surface morphologies of wear scars were examined by scanning electron microscope (SEM). The influences of ultrasonic vibration on friction reduction and anti-wear properties of GCr15/45# steel frictional pairs under different loads were discussed. The experimental results showed that, the friction of GCr15/45# steel frictional pairs could be reduced by ultrasonic vibration, and the reduction of friction coefficient became more obvious as the loads increasing. The friction coefficient measured under ultrasonic vibration is 12% lower than it measured without ultrasonic vibration when the load was 50N. However, the wear of frictional pairs increased under ultrasonic vibration, and the amplitude of wear volume enlarged with the loads increase, which is 63% at the load of 50N.

Effects of Friction Load and Ultrasonic Vibration on the Tribological Properties of Al2O3/Al2O3 Ceramic Friction Pairs under Liquid Paraffin Lubrication

2013 ◽  
Vol 652-654 ◽  
pp. 1881-1885
Author(s):  
Xin Yu Dong ◽  
Yu Lin Qiao ◽  
Yan Zang ◽  
Qing Sheng Cui
Keyword(s):  
Friction Coefficient ◽  
Ultrasonic Vibration ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Liquid Paraffin ◽  
Friction Reduction ◽  
Wear Volume ◽  
Oil Lubrication ◽  
Wear Properties ◽  
Load Range

The effects of friction load and ultrasonic vibration on friction reduction and anti-wear properties of Al2O3/Al2O3 ceramic frictional pairs under oil lubrication were investigated by a modified MFT-R4000 reciprocating friction and wear tester. The mechanism of friction reduction and anti-wear under ultrasonic vibration was discussed. The results showed that, the ultrasonic vibration could influence the friction reduction and anti-wear properties of Al2O3/Al2O3 ceramic friction pairs due to it could reduce the stress between the friction pairs and destroy the oil film on the surface of samples. When the friction frequency was 2Hz, the ultrasonic vibration could reduce the friction coefficient within experiment load range. When the loads were 70N, 80N, 90N and 100N, the average friction coefficient were reduced by 16.1%, 14.5%, 9.7% and 2.6%,and wear volume of frictional pairs decreased 35%、32%、31% and 12%.

Influence of Grease Characteristics on Gear Friction Loss

2015 ◽  
Author(s):  
Yoichi Matsumoto ◽  
Haruo Houjoh
Keyword(s):  
Friction Coefficient ◽  
Kinematic Viscosity ◽  
Friction Loss ◽  
Cone Penetration ◽  
Base Oil ◽  
Aluminum Complex ◽  
Gear Teeth ◽  
Gear Mesh ◽  
Lithium Soap ◽  
Mineral Base

In a previous study, we analyzed the mechanical loss factors of a small-sized geared motor comprising an induction motor and a parallel gear reducer. The load dependent loss is mainly caused by gear mesh friction, which is related to grease characteristics. This study investigates how the grease characteristics influence the friction loss of the gear mesh. The important grease characteristics are the cone penetration, kinematic viscosity, type of base oil, and type of thickener. The loss of gear mesh friction was evaluated in terms of the average friction coefficient between the gear teeth and was found to be unrelated to the cone penetration and kinematic viscosity of the base oil. The average friction coefficient of grease combined with lithium soap/poly urea and mineral base oil was 0.09–0.11; when combined with aluminum complex soap and synthetic base oil, the friction coefficient reduced to 0.07–0.08.

Influence of Aluminum Nanoparticles Additives on Tribological Properties of Base Oil

2017 ◽  
Vol 737 ◽  
pp. 184-191 ◽  
Author(s):  
Vu Nguyen Anh Le ◽  
Jau Wen Lin
Keyword(s):  
Oleic Acid ◽  
Wear Rate ◽  
Rotational Speed ◽  
Energy Dispersive Spectrometer ◽  
Optical Microscope ◽  
Friction Reduction ◽  
Aluminum Nanoparticles ◽  
Wear Properties ◽  
Base Oil ◽  
Pin On Disc

This study investigates the influence of aluminum nanoparticles, oleic acid as dispersants, and rotational speed on the tribological behavior of a lubricant. The experiments are performed on a pin-on-disc tribotester at a normal force of 90 N and a rotational speed ranging from 150 rpm to 600 rpm. Both the aluminum nanoparticles and oleic acid are in concentrations from 0 to 1 wt% and are added to the SN150 base oil. The results revealed that the addition of aluminum nanoparticles and oleic acid to the base oil will lead to significant friction reduction and anti-wear properties. The coefficient of friction (COF) and wear rate decreased after an increase in the concentration of nanoparticles and oleic acid, and an optimum concentration level was exhibited in which both COF and wear-rate were lowest. The viscosity and temperature of the lubricant are also evaluated. Further, the topography of discs after performance of sliding test have been analyzed through the use of an optical microscope, a scanning electron microscope (SEM), and an energy dispersive spectrometer (EDS) in order to interpret the mechanisms of nanoparticle action used to prevent friction and subsequent wear.

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