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The aim of the study is to predict the surface topological characteristics of Al-B4C composite electrodes and the OHNS Die steel in the Electrical Discharge Machining (EDM) Process. The surface characteristics of Composite electrodes are evaluated by using Scanning Electron Microscopy (SEM) and EDAX Analytical Method. Surface roughness and hardness of the OHNS die steel was measured by the Stylus probe and Brinnel hardness. The composite electrodes prepared by the Aluminium 6063 and B4C materials. Both elements are mixed at molten state in the stir casting process at different compositions. The chemical composition properties of the Composite electrode is analyzed by the SEM and EDAX testing. The surface Roughness of the OHNS steel measured by the Brinell hardness tester. Based on the SEM and EDAX results, the 92% Al 8% B4C was producing the good surface roughness in OHNS die steel.

Protecting interacting surfaces of mechanical systems against friction and wear have a wide range of industrial applications. Viscosity is the supreme property of any lubricant which overpowers viscous drag in hydro-dynamically lubricated mechanical systems. The dispersion stability of NiO-nanolubricants is achieved by ultrasonication technique. The detailed study of the viscosity of NiO nano-flakes dispersed in SN500 lubricants with weight fraction of 0.25-1.5% was performed in the temperature between 40-90 °C. The results show that increasing the weight fraction of NiO nano-flakes resulted in consistence viscosity increment. Further, the measured viscosity is compared with different concentration and temperature dependent theoretical models. On the basis on experimental viscosity data a theoretical correlation is recommended to predict the viscosity of NiO-nanolubricants with less than 5% margin of deviation.   Bull. Chem. Soc. Ethiop. 2020, 34(1), 203-214. DOI: https://dx.doi.org/10.4314/bcse.v34i1.19

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