Rabesh Kumar Singh

An Investigation on Tool Flank Wear Using Alumina/MoS2 Hybrid Nanofluid in Turning Operation

The present work is focused on the development of a hybrid nano-lubricant with improved tribological properties by mixing molybdenum-disulphide (MoS2) nanoparticles with alumina nanoparticles in oil-water emulsion base fluid in a fixed volumetric proportion (10:90). The tribological testing and contact angle measurement of prepared lubricants have been performed on pin-on-disc tribometer and goniometer, respectively. The hybrid lubricant has shown better results compare to base fluid (oil-water emulsion) and alumina-based monotype lubricant. Furthermore, the test results confirm the reduction in wear and coefficient of friction with increase of nanoparticle concentration. Moreover, the performance of hybrid nanofluid has been evaluated in terms of machining response using minimum quantity lubrication (MQL) technique on turning of AISI 304 steel. The addition of hybrid nanoparticles significantly reduces the tool flank wear as compared to monotype nano-lubricant and base fluid.

Influence of graphene and multi-walled carbon nanotube additives on tribological behaviour of lubricants

In the present study, the tribological performance of water-based emulsion (lubricant) was investigated by blending carbon fillers such as graphene nanoplatelets and multiwall carbon nanotubes using pin-on-disc tribometer. It was noticed that addition of GnP and MWCNT in water-based emulsion (conventional lubricant) increases the thermal conductivity and viscosity as compared to conventional lubricants. The nanolubricants were supplied with minimum quantity lubrication (MQL) technique at a constant flow rate and pressure in the sliding zone. The addition of 0.8 wt.% concentration of GnP showed 58.39% reduction in coefficient of friction and 61.80% reduction in wear depth compared to the conventional lubricant. Similarly, for 0.8 wt.% concentration of MWCNT showed 26.27% reduction in coefficient of friction and 47.35% reduction in wear depth compared to the conventional lubricant. The sliding surface micrographs were also investigated to explain the synergistic effect of nanoparticles.