Investigation of Interaction of Extreme Pressure Additive, Load and Sliding Speed Parameters with Silver Nano-particles in Wear Environment

2021 ◽  
Author(s):  
Yousef Alamin A. Ahmaida ◽  
Seyma Korkmaz ◽  
Sena Kabave Kilincarslan ◽  
Onur Can Sirvan ◽  
Muhammet Huseyin Cetin
Keyword(s):  
Nano Particles ◽  
Extreme Pressure ◽  
Sliding Speed

scholarly journals Extreme Pressure Properties of 600 N Base Oil Dispersed With Molybdenum Disulphide Nano Particles

2014 ◽  
Vol 2 (7) ◽  
pp. 220-225 ◽  
Author(s):  
V. Srinivas ◽  
Ch. Kodanda Rama Rao ◽  
M. Abyudaya ◽  
E Siva Jyothi
Keyword(s):  
Nano Particles ◽  
Extreme Pressure ◽  
Molybdenum Disulphide ◽  
Base Oil

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.

Study of behaviour of aluminium oxide nanoparticles suspended in SAE20W40 oil under extreme pressure lubrication

2015 ◽  
Vol 67 (4) ◽  
pp. 328-335 ◽  
Author(s):  
Avinash A. Thakre ◽  
Animesh Thakur
Keyword(s):  
Coefficient Of Friction ◽  
Normal Load ◽  
Friction Reduction ◽  
Lubricating Oil ◽  
Extreme Pressure ◽  
Sliding Speed ◽  
Content Type ◽  
Base Oil ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Purpose – The purpose of this paper is to include investigation on extreme pressure lubrication behaviour of Al2O3 nanoparticles suspended in SAE20W40 lubricating oil. Effects of nanoparticles size (40-80 nm) and its concentration (0-1 per cent) on the coefficient of friction is studied using pin-on-disc tribotester. Design/methodology/approach – Taguchi technique is used to optimize the process parameters for lower coefficient of friction. L18 orthogonal array involving six levels for one factor and three levels for remaining three factors is selected for the experimentation. The parameters selected for the study are sliding speed, normal load, nanoparticles size and its concentration in base oil. Findings – It has been found that the presence of nanoparticles in proper concentration shows excellent tribological improvement in frictional characteristics compared to the base oil. The optimal combination of the parameters for minimum coefficient of friction is found to be 0.8 per cent concentration of 60 nm sized Al2O3 nanoparticles, 1,200 rpm sliding speed and 160 N of normal load. The mechanism of friction reduction in presence of nanoparticles is investigated using scanning electron microscopy. Originality/value – This is the original work.

Insights into the tribological behavior of IF-WS2 nanoparticle reinforced mild extreme pressure lubrication for coated chromium/bulk grey cast iron interface

2020 ◽  
pp. 135065012096402
Author(s):  
Syed Danish Fayaz ◽  
MF Wani
Keyword(s):  
Cast Iron ◽  
Abrasive Wear ◽  
Friction And Wear ◽  
Cylinder Liner ◽  
Grey Cast Iron ◽  
Nano Particles ◽  
Laser Raman Spectroscopy ◽  
Extreme Pressure ◽  
Base Oil ◽  
Grey Cast

This study reports a novel synergetic approach combining nano-lubrication and conventional extreme pressure additivation, to explore the tribological performance of piston ring/cylinder liner conformal contact. Three typical lubricating formulations, viz, (i) PAO (poly-alpha-olefin) base oil (ii) base oil with mild extreme pressure (MEP) additive, and (iii) base oil with composite blend of mild extreme pressure (MEP) additive and WS2 nano-particles, were investigated using an ASTM G-99 Standard customized universal tribometer for evaluating friction and wear behavior of coated chromium/bulk grey cast iron (CI) tribopair. The lubricant formulations were tested at engine working temperature of 200 °C, reciprocated under a normal load of 30 N, stroke length of 10 mm and a constant sliding velocity of 0.2 ms−1. Wear attributes were evaluated by employing non-contact based 3 D optical profilometry. For assessment of tribo-surface morphology and associated surface characterization, Elemental Dispersion Spectral (EDS) incorporated Scanning Electron Microscope (SEM) was utilised. Green Laser Raman spectroscopy investigated tribo-chemistry, synergetic interactions and tribo-film formations. A state approaching super-lubricity and ultralow friction was achieved by sliding grey CI (Plateau Honed) cylinder liner against electroplated chrome stainless steel top compression ring with PAO10 base oil ultrasonically dispersed with 1 vol% of Isopropyl phenyl Phosphate (IPP), a mild extreme pressure (MEP) triaryl phosphate additive & 1 wt.% of WS2. Results obtained therein demonstrated four dominating forms of wear on the cast iron surface, i.e. plowing wear, abrasive wear, adhesive wear and oxidative wear. Counterpart chromium surface exhibited plowing and abrasive wear only. This substantial friction and wear reduction are attributed to the coalesced intrinsic characteristics of MEP and IF-WS2 additives, thus improving the overall lubrication characteristics of base oil.

History Dependence in Two-Disc Scuffing Tests

1988 ◽  
Vol 202 (3) ◽  
pp. 211-218 ◽  
Author(s):  
P A Williams ◽  
M P Finnis ◽  
D A Kelly
Keyword(s):  
Surface Roughness ◽  
Count Rate ◽  
Mineral Oil ◽  
Rolling Speed ◽  
Bulk Temperature ◽  
Extreme Pressure ◽  
History Dependence ◽  
Hypothetical Model ◽  
Sliding Speed ◽  
Friction Resistance

Salient features are described of a two-disc machine and its use to monitor friction, resistance drop count rate, surface roughness and disc bulk temperature in scuffing tests on mineral oil lubricated, case-hardened En 36A steel. Tests with two different load sequences and three oil supply temperatures are reported. Results for two extreme-pressure-additive oils are compared with earlier results for a non-additive oil and shown to support the validity of a recent hypothetical model by Baglin for the onset of microelastohydrodynamic lubrication. Compared to the non-additive oil, the additive oils gave higher disc bulk temperature rises, greater running-in and more severe conditions at scuffing when tested at sliding and rolling speeds of 6 m/s. Nevertheless, these scuffing conditions were not so severe as those for the non-additive oil tested at a sliding speed of 3 m/s and a rolling speed of 4.5 m/s.

Electron holography of catalysts

1995 ◽  
Vol 53 ◽  
pp. 416-417
Author(s):  
A. K. Datye ◽  
D. S. Kalakkad ◽  
L. F. Allard ◽  
E. Völkl
Keyword(s):  
Heterogeneous Catalysts ◽  
High Surface ◽  
High Surface Area ◽  
Atomic Scale ◽  
Nano Particles ◽  
Phase Image ◽  
Electron Holography ◽  
Specimen Thickness ◽  
Phase Information ◽  
Particle Structure

The active phase in heterogeneous catalysts consists of nanometer-sized metal or oxide particles dispersed within the tortuous pore structure of a high surface area matrix. Such catalysts are extensively used for controlling emissions from automobile exhausts or in industrial processes such as the refining of crude oil to produce gasoline. The morphology of these nano-particles is of great interest to catalytic chemists since it affects the activity and selectivity for a class of reactions known as structure-sensitive reactions. In this paper, we describe some of the challenges in the study of heterogeneous catalysts, and provide examples of how electron holography can help in extracting details of particle structure and morphology on an atomic scale.Conventional high-resolution TEM imaging methods permit the image intensity to be recorded, but the phase information in the complex image wave is lost. However, it is the phase information which is sensitive at the atomic scale to changes in specimen thickness and composition, and thus analysis of the phase image can yield important information on morphological details at the nanometer level.

Coherent electron nanodiffraction from clean silver nano particles in a UHV STEM

1993 ◽  
Vol 51 ◽  
pp. 1058-1059
Author(s):  
J. Liu ◽  
M. Pan ◽  
G. E. Spinnler
Keyword(s):  
Supported Catalysts ◽  
Imaging Techniques ◽  
Nano Particles ◽  
Metal Particles ◽  
Shape Structure ◽  
Dynamical Simulations ◽  
Small Metal Particles ◽  
Extract Information

Small metal particles have peculiar chemical and physical properties as compared to bulk materials. They are especially important in catalysis since metal particles are common constituents of supported catalysts. The structural characterization of small particles is of primary importance for the understanding of structure-catalytic activity relationships. The shape and size of metal particles larger than approximately 5 nm in diameter can be determined by several imaging techniques. It is difficult, however, to deduce the shape of smaller metal particles. Coherent electron nanodiffraction (CEND) patterns from nano particles contain information about the particle size, shape, structure and defects etc. As part of an on-going program of STEM characterization of supported catalysts we report some preliminary results of CEND study of Ag nano particles, deposited in situ in a UHV STEM instrument, and compare the experimental results with full dynamical simulations in order to extract information about the shape of Ag nano particles.

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