• G D THAKRE

      Articles written in Bulletin of Materials Science

    • Investigation of flow behaviour and lubrication capabilities of MoS$_2$

      P THAPLIYAL G D THAKRE

      More Details Abstract Fulltext PDF

      Flow behaviour of lubricants largely depends on their rheological properties which in turn strongly influence their lubrication capabilities and ultimately the machine life. Modern chemistry plays a great role in the synthesis of nano-additives that help in enhancing the rheological and tribological properties of the lubricants. In the present study, the rheological and tribological studies of MoS$_2$ nanofluids are presented in order to determine their flow behaviour and lubrication capabilities. For studying the effect of MoS$_2$ nanoparticles on the flow behaviour and lubrication capabilities of lubricants, two commercially available blended synthetic engine oils of SAE grades 5W-40 were selected. MoS$_2$ nanoparticles were synthesized by hydrothermal methods. Surface modification of the synthesized MoS$_2$ nanoparticles was performedbefore blending them with the base lubricants in 0.1, 0.15 and 0.2% concentrations. Standard ASTM and IS procedures were used to determine physicochemical properties and tribo-performance behaviour of oils, respectively. The rheological parameters of MoS$_2$ nanofluids were determined using a rheometer. The study reveals that tested MoS$_2$ nanofluids behavedas non-Newtonian lubricants with shear thinning behaviour at all tested temperatures and exhibited viscoelastic behaviour at small-shear rates. As a result of this anti-wear property showed a significant enhancement up to 20% for 0.2% MoS$_2$ indicating better anti-wear properties of MoS$_2$ nanofluids. However, a marginal reduction in friction for the tuning of 4% observed for 0.2 wt% of MoS$_2$ nanoparticles in the tested lubricants indicates that finished products have little scope to improve anti-friction properties under the influence of the already present additives.

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