Synthesis and Lubrication Characteristics of Aryloxycyclophosphazenes Substituted With Imidazolium

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Jinlong Li ◽  
Feng Zhou ◽  
Dapeng Feng ◽  
Yanqiu Xia ◽  
Weimin Liu
Keyword(s):  
Ionic Liquids ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Ambient Condition ◽  
Wear Volume ◽  
Tribochemical Reaction ◽  
Lubricating Film ◽  
Strong Adsorption ◽  
Contact Surfaces ◽  
Lubrication Characteristics

A series of new aryloxycyclophosphazene derivatives substituted with imidazolium ionic liquids was synthesized. Their tribological properties were investigated on an Optimol SRV IV oscillating friction and wear tester in ambient condition. An electric field was imposed between the ball and disk to monitor the tribochemical reaction by means of “contact resistance.” These ionic liquids substituted cyclophosphazene derivatives present lower friction coefficient and wear volume loss than tetrakis-(3-trifluoromethylphenoxy)-bis(4-fluorophenoxy)cyclotriphosphazene. The polarity of ionic liquids is believed to provide strong adsorption to contact surfaces and can form a boundary lubricating film leading to friction and wear reductions. Introducing the ionic liquids to cyclophosphazene may be a new method to improve the tribological properties of cyclophosphazene derivatives.

Investigation of the Tribological Properties of Surfactant-Modified MoS2 Microsized Spheres in Base Oil 500 SN

2007 ◽  
Vol 129 (4) ◽  
pp. 913-919 ◽  
Author(s):  
Xun Fu ◽  
Xiaodong Zhou ◽  
Huaqiang Shi ◽  
Danmei Wu ◽  
Zhengshui Hu
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Friction Reduction ◽  
Wear Volume ◽  
Reaction Products ◽  
Tribochemical Reaction ◽  
Adsorption Film ◽  
Base Oil ◽  
Flat Disk

The tribological properties of MoS2 microsized spheres (MS-MoS2) with diameter of 0.5–3μm modified by self-prepared surfactant quaternary ammonium salt of 2-undecyl-1-dithioureido-ethyl-imidazoline (SUDEI) as an additive in base oil 500 SN were investigated and compared with those of commercial colloidal MoS2(CC-MoS2) on a four-ball tester and an Optimol SRV oscillating friction and wear tester in a ball-on-disk contact configuration. The worn surfaces of the bottom flat disk were examined with scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that the MoS2 microsized spheres product was a much better extreme-pressure additive and antiwear and friction-reduction additive in 500 SN than commercial colloidal MoS2(CC-MoS2). Under the appropriate concentration of 0.1% and 0.25% for MS-MoS2 and CC-MoS2 and the load of 400N, the friction coefficient of MS-MoS2/oil and CC-MoS2/oil decreased about 25.0% and 12.5% and the wear volume loss decreased about 50.4% and 12.9% compared with the pure base stock. The boundary lubrication mechanism could be deduced as the effective chemical adsorption film formed by the long chain alkyl (C11H23) and active elements (S and N) in the surfactant SUDEI and tribochemical reaction film composed of the tribochemical reaction products.

scholarly journals Tribological properties of novel palygorskite nanoplatelets used as oil-based lubricant additives

Friction ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 332-343 ◽  
Author(s):  
Kunpeng Wang ◽  
Huaichao Wu ◽  
Hongdong Wang ◽  
Yuhong Liu ◽  
Lv Yang ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Magnesium Silicate ◽  
Treatment Method ◽  
Lubricant Additives ◽  
Wear Volume ◽  
Wear Scar Diameter ◽  
Tribochemical Reaction ◽  
Base Oil ◽  
Transmission Electron ◽  
Ball Surface

AbstractLayered palygorskite (PAL), commonly called attapulgite, is a natural inorganic clay mineral composed of magnesium silicate. In this study, an aqueous miscible organic solvent treatment method is adopted to prepare molybdenum-dotted palygorskite (Amo-PMo) nanoplatelets, which greatly improved the specific surface area of PAL and the dispersion effect in an oil-based lubricant system. Their layered structure and size were confirmed using transmission electron microscopy (TEM) and atomic force microscopy. Following a tribological test lubricated with three additives (PAL, organic molybdenum (SN-Mo), and Amo-PMo), it was found that the sample of 0.5 wt% Amo-PMo exhibited the best tribological properties with a coefficient of friction of 0.09. Moreover, the resulting wear scar diameter and wear volume of the sliding ball surface were 63% and 49.6% of those lubricated with base oil, respectively. Its excellent lubricating performance and self-repairing ability were mainly attributed to the generated MoS2 adsorbed on the contact surfaces during the tribochemical reaction, thereby effectively preventing the direct collision between asperities on sliding solid surfaces. Thus, as-prepared Amo-PMo nanoplatelets show great potential as oil-based lubricant additives, and this study enriches the existing application of PAL in industry.

scholarly journals Tribological Behavior of Si3N4/Ti3SiC2Contacts Lubricated by Lithium-Based Ionic Liquids

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Haizhong Wang ◽  
Zenghong Song ◽  
Dan Qiao ◽  
Dapeng Feng ◽  
Jinjun Lu
Keyword(s):  
Ionic Liquids ◽  
Elevated Temperature ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Room Temperature ◽  
Tribological Behavior ◽  
Tribological Performance ◽  
Experimental Conditions ◽  
Thermal Stabilities ◽  
Protective Films

The tribological performance of Si3N4ball sliding against Ti3SiC2disc lubricated by lithium-based ionic liquids (ILs) was investigated using an Optimol SRV-IV oscillating reciprocating friction and wear tester at room temperature (RT) and elevated temperature (100°C). Glycerol and the conventional imidazolium-based IL 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (L-F106) were used as references under the same experimental conditions. The results show that the lithium-based ILs had higher thermal stabilities than glycerol and lower costs associated with IL preparation than L-F106. The tribotest results show that the lithium-based ILs were effective in reducing the friction and wear of Si3N4/Ti3SiC2contacts. [Li(urea)]TFSI even produced better tribological properties than glycerol and L-F106 both at RT and 100°C. The SEM/EDS and XPS results reveal that the excellent tribological endurance of Si3N4/Ti3SiC2contacts lubricated by lithium-based ILs was mainly attributed to the formation of surface protective films composed of various tribochemical products.

Functionalized Ionic Liquids as Lubricants for Steel-Steel Contact

2011 ◽  
Vol 138-139 ◽  
pp. 630-634 ◽  
Author(s):  
Li Ye Zhu ◽  
Li Gong Chen ◽  
Xin Yang ◽  
Hong Bin Song
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Friction Mechanisms ◽  
Ester Group ◽  
Friction Reducing

A new series of functionalized ionic liquids containing ester-group were synthesized through a typical two-step way. The physicochemical properties of the functionalized ionic liquids were studied and the tribological properties of them as lubricants for steel-steel contact were evaluated on an SRV friction and wear tester and compared with the perfluoroalkylpolyether (PFPE), a low-volatility and fluorine containing lubricant, and a conventional ionic liquid, 1-butyl-3-methy imidazolium tetrafluoroborate (LB104), which is nonfunctionalized. Results showed that all the ionic liquids studied in this paper have better lubricities than PFPE as lubricants for steel-steel friction pairs. Functionalized ionic liquids show worse friction reducing abilities at relatively lower loads, which could be ascribed to their higher viscosities, but they always exhibit better anti-wear abilities than LB104. The possible friction mechanisms were discussed.

Preparation of Several Ionic Liquids with Excellent Friction-Reducing and Antiwear Properties

2013 ◽  
Vol 668 ◽  
pp. 547-550
Author(s):  
Ding Jun Zhang ◽  
Chao Yun Qu
Keyword(s):  
Ionic Liquids ◽  
Friction And Wear ◽  
Ambient Condition ◽  
Tribological Behaviour ◽  
Antiwear Properties ◽  
Friction Reducing ◽  
Reducing Properties

Four ionic liquids containing dithiocarbazate were synthesized. Their antiwear and friction-reducing properties of these synthetic liquid compounds as the lubricants of a steel/steel contact were examined using an Optimol SRV oscillating friction and wear tester in ambient condition. The results indicated that the ionic liquids containing dithiocarbazate as the lubricants showed excellent friction-reducing and antiwear properties for the steel/steel pair. The introduction of the dithiocarbazate group into the molecules of the ionic liquids contributed to improve the tribological behaviour.

The Preparation and Tribological Properties of Multi-Layer Graphene as Paraffin Liquid Additives

2014 ◽  
Vol 1058 ◽  
pp. 56-60
Author(s):  
Hai Chao Zhao ◽  
Yu Lin Qiao ◽  
Yan Zang ◽  
Qing Zhang
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Ambient Condition ◽  
Wear Properties ◽  
Layer Graphene ◽  
Friction And Wear Properties ◽  
Dispersing System ◽  
Worn Surface ◽  
Different Thickness ◽  
Paraffin Liquid

Different thickness multi-layer graphene were prepared by the method of liquid ultrasonic stripping and characterized by XRD, SEM and TEM. Friction and wear properties of graphene liquid dispersing system were investigated using an Multi-functional reciprocating friction and wear tester in ambient condition. Results indicate that the graphene were in thickness of 10nm-100nm. Multi-layer graphene showed good anti-friction and anti-wear properties as paraffin liquid additives. Multi-layer graphene liquid dispersing system had the best tribological properties with 20N and 0.01wt%, and the average friction coefficient was 0.129, and the wear mass was 4.12×106μm3, reduced by 21.34% and 41.14% than paraffin liquid. The reason is that Multi-layer graphene could adsorb on the worn surface and form solid adsorption layer, which maked the friction and wear reduce.

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%.

scholarly journals Tribological Properties of SiO2@Cu And SiO2@MoS2 Core-Shell Microspheres As Lubricant Additives

2021 ◽  
Author(s):  
Xiaoliang Ma ◽  
Chaoliang Gan ◽  
Xiaopeng Li ◽  
Yuting Li ◽  
Peng Feng ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Hard Core ◽  
Lubricant Additives ◽  
Friction Reduction ◽  
Wear Volume ◽  
Core Shell ◽  
Base Oil ◽  
Tribological Behaviors ◽  
Lubrication Performance

Abstract Herein, core-shell structural SiO2@Cu and SiO2@MoS2 microspheres were prepared using SiO2 as hard core, Cu and MoS2 as shell. As lubricant additives were introduced into base oil (PAO 40), their friction-reduction and wear-resistance were investigated in detail. Comparing with onefold additive (SiO2, Cu and MoS2), such core-shell structure additives can improve the tribological behaviors at the Hertz contact stress range of 1.26 ~ 2.72 GPa (SiO2@Cu reduces the friction and wear up to 32.47% and 67.86% at 2.72 GPa, respectively). Besides, the tribological properties of SiO2@Cu microspheres are superior to that of SiO2@MoS2 (the wear volume was reduced by 48.45% at 2.72 GPa). The excellent tribological behaviors of SiO2@Cu microspheres can be ascribed to its structural advantage, the synergistic effect of hard SiO2 core and Cu shell. The rolling effect of SiO2, easy-shearing and self-repairing of Cu shell offer a synergistic lubrication function and form a dense protection film, thereby contributing to the optimal lubrication performance.

scholarly journals Physicochemical and tribological properties of gemini-type halogen-free dicationic ionic liquids

Friction ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 344-355
Author(s):  
Qiangliang Yu ◽  
Chaoyang Zhang ◽  
Rui Dong ◽  
Yijun Shi ◽  
Yurong Wang ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Tribological Properties ◽  
Alkyl Chain ◽  
Electrical Contact ◽  
Test Results ◽  
Electrical Contact Resistance ◽  
Tribochemical Reaction ◽  
X Ray ◽  
Dicationic Ionic Liquids ◽  
Halogen Free

AbstractA series of new halogen-free dicationic ionic liquids (ILs) with different alkyl chain lengths were prepared, and the relationship between the alkyl chain length, physicochemical and tribological properties of ILs, and their role as neat lubricant for steel-steel friction pairs, was investigated. Evaluation of stability during hydrolysis and copper strip corrosion test results show that synthetic ILs are stable and not corrosive to metal contacts, due to the halogen-free anions. The friction and wear test results indicate that ILs with long alkyl chains have excellent friction-reducing and anti-wear properties, especially at high temperatures. Based on the surface three-dimensional (3D) profiles, electrical contact resistance, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and the X-ray photoelectron spectrometry (XPS) analysis of the worn surfaces of steel discs, we can conclude that the efficiency of ILs is due to the formation of high quality tribofilms that consist of both tribochemical reaction and ordered absorption films.

Analysis of thermal stability and lubrication characteristics of Millettia pinnata oil

RSC Advances ◽  
2016 ◽  
Vol 6 (84) ◽  
pp. 81414-81425 ◽  
Author(s):  
M. H. Mosarof ◽  
M. A. Kalam ◽  
H. H. Masjuki ◽  
A. Arslan ◽  
I. M. Monirul ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Friction And Wear ◽  
Metal Contact ◽  
Millettia Pinnata ◽  
Contact Surfaces ◽  
Lubrication Characteristics

Lubricants are mostly used to reduce the friction and wear between sliding and metal contact surfaces, allowing them to move smoothly over each other.

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