This paper presents the surface modification of aluminium-6061 by electric discharge machining (EDM). Si–Cu powder metallurgical green compact tool is used to deposit its material on to the work surface under reverse polarity of EDM. Compact load, current and pulse on-time are selected control parameters. Material deposition rate (MDR), tool wear rate (TWR) and surface roughness ([Formula: see text] are considered as process outputs. Scanning electron microscopic (SEM) analysis and energy dispersive X-ray (EDX) analysis show the presence of tool materials in the deposit of work surface. Olympus optical micrograph shows an average thickness of the deposited layer to be 18.73[Formula: see text][Formula: see text]m. The hardness of the deposited layer is found to be 268[Formula: see text]HV. Analysis of variance (ANOVA) shows the compact load to be the most effective parameter on surface modification followed by pulse on-time and current, respectively.
Now-a-days carbon nanotube (CNT) is widely used because of its inimitable properties such as high electrical and thermal conductivities, high tensile strength, etc. In this work, an attempt has been made to modify the surface of Al-7075 alloy using Cu-MWCNT powder metallurgy green compact tool in the electric discharge machining process. The effects of contributing parameters i.e. peak current (I p ), voltage and compact load (CL) have been investigated with respect to performance measures such as, Material Deposition Rate (MDR), Tool Wear Rate (TWR) and Surface Roughness (Ra). The modified surface has been assessed by optical microscopy, FESEM, XRD and EDS analyses. Highest MDR of 0.15 mg min -1 , lowest TWR of 2.05 mg min -1 and lowest Ra of 2.57 µm have been attained. The deposition of tool materials has improved the microhardness up to 2.6 times than that of base material.
A facile wet-chemical approach was adopted to synthesize zinc oxide, titanium dioxide, and iron (II/III) oxide, followed by synthesis of ZnO-TiO2-Fe3O4 nanocomposite via physical mixing. The synthesized nanoparticles were characterized using X-ray diffraction, UV-Visible spectroscopy, vibrating sample magnetometry, transmission electron microscopy, and energy-dispersive X-ray spectroscopy in order to investigate various physical and chemical characteristics of the prepared samples. Furthermore, the catalytic reduction performance of prepared nanomaterials was studied by Methylene blue (MB), and Rhodamine-B (Rh-B) removal in aqueous solutions under UV/visible light illumination. It has been observed that, the degradation efficiency of the nanocomposite was equivalent or, slightly better than TiO2 nanoparticles, and higher than ZnO nanoparticles against both the dye solution. While its removal efficiency using external magnetic field is much higher than the constituent nanoparticles, owing to its higher saturation magnetization. So, the obtained results suggest that, produced nanocomposite can be employed as high potential catalyst for the reduction of organic dyes and pollutants in waste water treatments.
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