Anti Friction Properties of Motor Oil Dispersed with WS2 and MoS2 Nanoparticles

2014 ◽  
Vol 592-594 ◽  
pp. 1272-1276
Author(s):  
V. Srinivas ◽  
Dedeepya Valluripally ◽  
P.V. Manikanta ◽  
V. Satish
Keyword(s):  
Friction Coefficient ◽  
Performance Analysis ◽  
Tribological Behavior ◽  
Motor Oil ◽  
Base Oil ◽  
Base Oils ◽  
Pin On Disc ◽  
Surface Modified

This works presents a study on anti friction properties, of fully formulated SAE 20W 40 grade motor oil dispersed with surface modified WS2and MoS2nanoparticles. WS2and MoS2particles of 0.05 wt. % and 0.1 wt. % have been dispersed in SAE 20W 40 motor oil by Sonication and tested for tribological behavior on pin on disc apparatus as per ASTM G99 standards. The friction coefficient values for base oil and oil dispersed with WS2and MoS2nanoparticles have been evaluated and compared to obtain the performance analysis. Performance graphs have plotted for the base oil and oil dispersed with nanoparticles for comparison. The oils with dispersed nanoparticles have shown enhanced performance in comparison to the base oils in terms of anti friction properties.

High Temperature Tribological Behavior of Nano-Al2O3 in Different Base Oils

2008 ◽  
Vol 373-374 ◽  
pp. 568-571 ◽  
Author(s):  
X.F. Sun ◽  
Yu Lin Qiao ◽  
Jia Wu He ◽  
Shi Ning Ma ◽  
C.H. Hu
Keyword(s):  
High Temperature ◽  
Ball Bearing ◽  
Tribological Behavior ◽  
Test System ◽  
High Load ◽  
Friction Coefficients ◽  
Base Oil ◽  
Base Oils ◽  
Al2o3 Particles ◽  
Reducing Properties

High temperature tribological behavior of nano-Al2O3 in different base oils were tested by a SRV multifunctional test system. The results show that the nano-Al2O3 particles can obviously improve the antiwear and friction reducing properties of the base oil under high temperature and high load. The friction coefficients of the base oil with added nano-Al2O3 are reduced about 35%, and abrasion loss reduces about 60%. When temperature is 500°C and load is 500N the pure base oil has lost lubricative function, but the base oil with added nano-Al2O3 can still remain the lower friction coefficients. Tribological behavior should be similar to the “ball bearing” lubrication action of the nano-Al2O3 particles, so the movement between the two tribological pairs becomes sliding/rolling.

Influence of Additive Chemistry on the Tribological Behavior of Steel/Copper Friction Pairs

2021 ◽  
Author(s):  
Weimin Li ◽  
Huaigang Su ◽  
Yunlong Chen ◽  
Rui Ma ◽  
Gaiqing Zhao ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
High Performance ◽  
Tribological Behavior ◽  
Tribological Performance ◽  
Copper Oxides ◽  
Wear Volume ◽  
Base Oil ◽  
Lubrication Film ◽  
Order Of Magnitude

Abstract The tribological behavior of boundary lubrication is largely dominated by the anti-wear additives. Here five different anti-wear additives were selected and their tribological properties for a steel-copper contact were investigated. It was found that the tribological performance are highly depending on the anti-wear additive chemistry which determines activity, element compositions of the additive. An amine phosphate anti-wear additive AW 316 exhibit best tribological performance with the lowest mean friction coefficient of 0.082 and smallest wear volume which is more than one order of magnitude smaller than base oil. The friction-reducing order of the tested anti-wear additives are AW 316 > ZDDP > 353 > TCP > [P8888][DEHP] while anti-wear showed similar trend. In addition, the tribological mechanism of AW 316 were also discussed based on surface analysis results, and it was found that an even boundary lubrication film of 10–15 nm which was composed of copper oxides, phosphates, amines was formed on the copper disc and is responsible for its outstanding tribological performances. This study provides fundamental insights of the compatibilities among steel-copper friction pairs and suitable anti-wear additives, which can be beneficial for the development of high performance used for steel-copper friction pairs.

Production Tribological Behavior Feature of Metallic Nanoparticle Additives

2015 ◽  
Vol 756 ◽  
pp. 275-280
Author(s):  
Sergey A. Belyaev ◽  
N.V. Martyushev ◽  
Irina V. Belyaeva
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Metal Nanoparticles ◽  
Tribological Behavior ◽  
Metallic Nanoparticle ◽  
Base Oils ◽  
Nanoparticle Additives

Today an application of metal nanoparticles as additives to base oils is widely studied in tribological centers in many countries. The additives containing nanoparticles essentially raise the wear resistance ability of lubricants and reduce the friction coefficient. However, such lubricants are still not widely used. This paper gives a brief analysis of the problem.

Investigation of Micro-Tribological Behavior of MS2 Nanotubes

2007 ◽  
Vol 121-123 ◽  
pp. 785-788 ◽  
Author(s):  
Chang Sheng Li ◽  
Ke Hong Yan ◽  
Jun Mao Li ◽  
Xiao Ping Shen ◽  
Kang Min Chen
Keyword(s):  
Friction Coefficient ◽  
Tribological Behavior ◽  
Solid Lubricants ◽  
Van Der Waals Interactions ◽  
Low Friction ◽  
Research Papers ◽  
Friction Process ◽  
Pin On Disc ◽  
Metal Dichalcogenides ◽  
Covalent Interactions

It is well known that metal dichalcogenides MS2 (M=Mo, W, Nb, Ta, TiS, Zr ,Hf, S=S, Se) have lamellar structure, the bonds of adjacent lamellae are weak van der Waals interactions and inter-lamellar are strong covalent interactions. The structures make adjacent lamellae easy to slip and it shows low friction coefficient during friction process. MS2 are often used as solid lubricants in high/low temperature, heave load and vacuum, in which oil is failure. WS2 has better high temperature properties than MoS2, although little natural WS2 mineral has been deposited, and people must synthesize it by chemical means, so its price is nearly 5 times expensive than that of MoS2. Until now little study is made comparing with MoS2. Furthermore the research papers about tribological behavior of NbS2, TaS2, TiS2, ZrS2, HfS2 are not seen. In this study the thermal decomposition method is used to produce fullerene-like MS2 nanotubes. The morphology, microstructure and tribological behavior of MS2 nanotubes are investigated by means of SEM, TEM, XRD and AFM. The results show that the diameter of MoS2, WS2 and NbS2 nanotube is less than 100nm, and the length is more than 2μm. The MoS2, WS2 nanotube has lower friction coefficient than MoS2 powder tested by AFM using Si3N4 probe. Similar results are also found for NbS2 nanotube. The macroscopic friction test for pin on disc tester shows nearly the same results. TEM image shows that MS2 nanotubes have rolling debris between two antagonist surfaces, and MoS2 powder only has flattened debris. It may be the fullerene structure brings the chemical stability and lead low friction.

scholarly journals Boundary Friction of ZDDP Tribofilms

2020 ◽  
Vol 69 (1) ◽  
Author(s):  
Jie Zhang ◽  
Mao Ueda ◽  
Sophie Campen ◽  
Hugh Spikes
Keyword(s):  
Friction Coefficient ◽  
Group Structure ◽  
Boundary Friction ◽  
Considerable Proportion ◽  
Base Oil ◽  
Characteristic Boundary ◽  
Long Duration ◽  
Structure Boundary ◽  
Alkoxy Groups ◽  
20 Nm

AbstractThe frictional properties of ZDDP tribofilms at low entrainment speeds in boundary lubrication conditions have been studied in both rolling/sliding and pure sliding contacts. It has been found that the boundary friction coefficients of these tribofilms depend on the alkyl structure of the ZDDPs. For primary ZDDPs, those with linear alkyl chains give lower friction those with branched alkyl chain ZDDPs, and a cyclohexylmethyl-based ZDDP gives markedly higher friction than non-cyclic ones. Depending on alkyl structure, boundary friction coefficient in rolling-sliding conditions can range from 0.09 to 0.14. These differences persist over long duration tests lasting up to 120 h. For secondary ZDDPs, boundary friction appears to depend less strongly on alkyl structure and in rolling-sliding conditions stabilises at ca 0.115 for the three ZDDPs studied. Experiments in which the ZDDP-containing lubricant is changed after tribofilm formation by a different ZDDP solution or a base oil indicate that the characteristic friction of the initial ZDDP tribofilm is lost almost as soon as rubbing commences in the new lubricant. The boundary friction rapidly stabilises at the characteristic boundary friction of the replacement ZDDP, or in the case of base oil, a value of ca 0.115 which is believed to represent the shear strength of the bare polyphosphate surface. The single exception is when a solution containing a cyclohexylethyl-based ZDDP is replaced by base oil, where the boundary friction coefficient remains at the high value characteristic of this ZDDP despite the fact that rubbing in base oil removes about 20 nm of the tribofilm. XPS analysis of the residual tribofilm reveals that this originates from presence of a considerable proportion of C-O bonds at the exposed tribofilm surface, indicating that not all of the alkoxy groups are lost from the polyphosphate during tribofilm formation. Very slow speed rubbing tests at low temperature show that the ZDDP solutions give boundary friction values that vary with alkyl group structure in a similar fashion to rolling-sliding MTM tests. These variations in friction occur immediately on rubbing, before any measurable tribofilm can develop. This study suggest that ZDDPs control boundary friction by adsorbing on rubbing steel or tribofilm surfaces in a fashion similar to organic friction modifiers. However it is believed that, for primary ZDDPs, residual alkoxy groups still chemically bonded to the phosphorus atoms of newly-formed polyphosphate/phosphate tribofilm may also contribute to boundary friction. This understanding will contribute to the design of low friction, fuel efficient crankcase engine oils. Graphical Abstract

scholarly journals The Impact of Heat Treatment on the Behavior of a Hot-Dip Zinc Coating Applied to Steel During Dry Friction

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 660
Author(s):  
Dariusz Jędrzejczyk ◽  
Elżbieta Szatkowska
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Zinc Coating ◽  
Pin On Disc ◽  
The One ◽  
The Impact ◽  
Coating Hardness ◽  
Anticorrosion Properties

The analyzed topic refers to the wear resistance and friction coefficient changes resulting from heat treatment (HT) of a hot-dip zinc coating deposited on steel. The aim of research was to evaluate the coating behavior during dry friction after HT as a result of microstructure changes and increase the coating hardness. The HT parameters should be determined by taking into consideration, on the one hand, coating wear resistance and, on the other hand, its anticorrosion properties. A hot-dip zinc coating was deposited in industrial conditions (according EN ISO 10684) on disc-shaped samples and the chosen bolts. The achieved results were assessed on the basis of tribological tests (T11 pin-on-disc tester, Schatz®Analyse device, Sindelfingen, Germany), microscopic observations (with the use of optical and scanning microscopy), EDS (point and linear) analysis, and microhardness measurements. It is proved that properly applied HT of a hot-dip zinc coating results in changes in the coating’s microstructure, hardness, friction coefficient, and wear resistance.

Tribological Behavior of PTFE Nanocomposites Reinforced with PBA Grafted Alumina Nanoparticles

2012 ◽  
Vol 184-185 ◽  
pp. 1380-1383
Author(s):  
Yong Ping Niu ◽  
Xiang Yan Li ◽  
Jun Kai Zhang ◽  
Ming Han ◽  
Yong Zhen Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Tribological Behavior ◽  
Compression Molding ◽  
Alumina Nanoparticles ◽  
Low Friction ◽  
Grafted Nanoparticles ◽  
Scanning Electron

Polybutyl acrylate (PBA) grafted alumina nanoparticles were synthesized. Polytetrafluoroethylene (PTFE) nanocomposites reinforced with PBA grafted nanoparticles were prepared by compression molding. The effects of PBA grafted nanoparticles on the tribological behavior of the PTFE nanocomposites were investigated on a tribometer. The abrasion mechanisms of the PTFE nanocomposites were investigated by scanning electron microscopy (SEM) of the abraded surfaces. The results show that the addition of PBA grafted nanoparticles maintains low friction coefficient and improves the wear resistance of the PTFE nanocomposites.

Tribological Behavior of Mesophase Carbon Added with Titanium and Copper

2011 ◽  
Vol 80-81 ◽  
pp. 60-63
Author(s):  
Xue Qing Yue ◽  
Hua Wang ◽  
Shu Ying Wang
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Friction Coefficient ◽  
Ball Mill ◽  
Friction And Wear ◽  
Applied Load ◽  
Tribological Behavior ◽  
Metallic Elements ◽  
X Ray Diffraction ◽  
X Ray

Incorporation of metallic elements, titanium and copper, into carbonaceous mesophase (CM) was performed through mechanical alloying in a ball mill apparatus. The structures of the raw CM as well as the Ti/Cu-added CM were characterized by X-ray diffraction. The tribological behavior of the Ti/Cu-added CM used as lubricating additives was investigated by using a high temperature friction and wear tester. The results show that, compared with the raw CM, the Ti/Cu-added CM exhibits a drop in the crystallinity and a transition to the amorphous. The Ti/Cu-added CM used as lubricating additive displays an obvious high temperature anti-friction and wear resistance effect, and the lager the applied load, the lower the friction coefficient and the wear severity.

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