Abstract:

Nanofluids offer extremely positive contributions to the machining performance in the metalworking industry. Although studies on nanofluids have been intensified in recent years, shelf-life and homogeneity are a matter of curiosity. Different surface agents (surfactants) can be added to the mixture in order to obtain a homogeneous nanofluid and increase the shelf-life of the mixture. In this study, nanofluid mixtures were prepared by adding cethyltrimethylammonium bromide (CTAB), polyvinylpolypyrrolidone (PVP) and sodium dodecyl sulphate (SDS) at different rates into CuO nanoparticle added vegetable based oil. A series of milling experiments were applied to AISI 329 duplex stainless steel material to determine the effects of surfactants added in the same proportions on the machining performance. Experiments were carried out using the Taguchi L9 experimental set. Three different surfactants (CTAB, PVP, and SDS), cutting speed (120, 160, and 200 m/min), feed (0.10, 0.15, and 0.20 mm/rev) were selected as input parameters in the experiments. Surface roughness (Ra), cutting temperature (T) and tool wear were preferred as machining performance criteria. Analysis of variance (ANOVA) was used to determine the effect levels of the factors. According to the results obtained from the experiments; it was determined that PVP surfactant-added CuO nanofluid showed best performance in surface quality, cutting temperature and tool wear according to other surfactants.

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