CSIR Central

Effect of Layered MoS2 Nanoparticles on the Frictional Behavior and Microstructure of Lubricating Greases

IR@CMERI: CSIR- Central Mechanical Engineering Research Institute (CMERI), Durgapur

View Archive Info
 
 
Field Value
 
Title Effect of Layered MoS2 Nanoparticles on the Frictional Behavior and Microstructure of Lubricating Greases
 
Creator Sahoo, R.R.
Biswas, S.K.
 
Subject Materials
Nanomaterials & composites
 
Description Lithium stearate soap and layered MoS2 nanoparticles encapsulated in lithium stearate soap are prepared in the laboratory, and their lubricating properties are compared with respect to the particle and particle concentration. The tribotracks after friction test was investigated with Raman Spectroscopy, scanning electron microscopy (SEM) and 3D optical profilometry to understand the action mechanism. The status of the soap particles on a tribotrack changes with time, contact pressure and sliding speed. At low pressure and speed, individual solid undeformed soap particle stand proud of the surface and the topography shows marginal difference with sliding time. In these conditions, no frictional difference between the performance of grease with and without the nanoparticles is observed. Increasing the contact pressure and temperature (low speed and high speed) has a dramatic effect as the soap particles melt and the liquid soap flows over the track releasing the hitherto encapsulated nanoparticles. Consequently, the soap smears the track like a liquid, and the nanoparticles now come directly into the interface and are sheared to generate a low-friction tribofilm. At high particle concentration, the sliding time required for melting of the soap and release of MoS2 is reduced, and the tribofilm is more substantial and uniform consisting of smeared MoS2 and carboxylate soap as observed by SEM and 3D optical profilometry. A change in the Raman Spectra is observed with particle concentration, and this is related to morphology and microstructure of the tribofilm generated.
 
Publisher Springer
 
Date 2014
 
Type Article
PeerReviewed
 
Identifier Sahoo, R.R. and Biswas, S.K. (2014) Effect of Layered MoS2 Nanoparticles on the Frictional Behavior and Microstructure of Lubricating Greases. Tribology Letters, 53. pp. 157-171.
 
Relation http://cmeri.csircentral.net/28/