Synthesis and Characterization of Graphene Oxide Nanoparticles and investigation of Nanofluid Application in Machining Process

The quality of machined workpieces, particularly precious metals, is the main goal of every machining process. A suitable cutting fluid can substantially affect the machining outcome. The study is novel in that it uses nanofluids in the machining process to mitigate the adverse effects of high temperatures and friction. Graphene oxide (GO) nanoparticles were synthesized using the modified Hummers method. FTIR, FESEM and XRD tests were used for GO characterization as well as for its atomic, surface and chemical analyses. The studied workpiece was a bronze shaft, ⌀20 mm. Different nanofluid solutions (0.25 and 0.5 vol%) were applied to reduce machining loads and increase workpiece flatness. The results were then compared with those from a base water-oil (90-10 vol%) cutting fluid (Behran, Iran). The NP characterization confirmed the satisfactory quality of particles. It also showed that the effect of NP on machining forces is substantial. Accordingly, the largest reduction in the mean machining force was achieved when using the 0.5% nanofluid solution (28.34% less than base fluid). The surface roughness of the bronze shaft was lower when using the 0.5% nanofluid (0.57 mμ) instead of the base fluid (0.668 mμ). Finally, it can be concluded that this nanofluid can be an alternative to base fluids in the machining process.