Volume 11 Issue 2 ( June )

The utilisation of hybrid nanofluid as a lubricant has a synergistic impact. This work investigated the tribological and physicochemical aspects of modified refine, bleach, and deodorize (RBD) palm oil (MRPO) comprising 0.025 weight % of hexagonal boron nitride (hBN) + titanium dioxide (TiO2) (MRPOht) and hBN + tungsten disulfide (WS2) (MRPOhw). The nanofluids' physicochemical parameters were assessed using kinematic viscosity, viscosity index and thermal conductivity Furthermore, the tribological performance of the nanofluids were assessed using a four- ball test. The MRPO samples were evaluated against the marketable Synthetic Ester (SE). The outcomes presented that MRPOht has exceptional physical properties, with kinematic viscosity values of 22.82 mm2/s at 40 °C and 7.01 mm2/s at 100 °C. Moreover, MRPOht boasts the highest viscosity index, which stands at an impressive 303. MPROhw had higher thermal conductivity of 0.1580 W.m.K and exhibits an outstanding coefficient of friction (COF) of 0.0662. The average wear scar diameters (MWSD) of MRPOs were smaller than those of SE. Overall, the combination of MRPO with hybrid additives exhibits exceptional physical, chemical, and friction-related properties, which establishes it as a feasible choice for an environmentally friendly metalworking fluid.

Keywords: nanofluids, hybrid nanofluids, nanoparticles, metalworking fluids