Кафедра прикладної механіки та мехатроніки
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Item type:Наукова стаття, The State of Electrolytic Plasma in Synthesis of Oxide Ceramic Coatings on the Magnesium Basis(Cham: Springer, 2023-05-23) Povstyanoy, Oleksandr; Posuvailo, Volodymyr; Imbirovych, Nataliya; Tkachuk, ValentynaThe basis for determining the density of electrons in plasma is the study of the broadening of spectral lines, which is caused by the linear Shtarkeffect. AQ1 This article demonstrates the applicability of the classical theory of scattering, with the help of which, analyzing the spectral characteristics of spark plasma discharges in the electrochemical system of magnesium-electrolyte, determined that during the synthesis of oxide-ceramic coatings on a magnesium basis in discharge channels for electron density (3.2…3.4)·1022 m−3 and their temperatures (1…1.1)·104 K equilibrium, not degenerate, quasi-ideal plasma is formed with an ionicity (0.02…0.10). This temperature makes conditions for dissociation and ionization of electrolyte components and also ensures high chemical reactivity. At the same time, the speed of the reaction is much higher compared to classical electrochemical methods. The performed calculations provide the possibility of further correct thermodynamic calculation of the concentrations of the reaction products of the synthesis of oxide ceramic coatings in the electrolytic plasma of the magnesium alloy–electrolyte system.Item type:Наукова стаття, Numerical Evaluation of the Properties of Highly Efficient Titanium Porous Materials(Cham: Springer Nature Switzerland, 2023-08-21) Povstyanoy, Oleksandr; Imbirovich, Nataliya; Redko, Rostyslav; Redko, Olha; Savaryn, PavloAn exciting combination of such properties as high strength, low den- AQ1 sity, corrosion resistance, and biocompatibility characterizes titanium. However, the widespread use of titanium at the industrial level has not yet been achieved due to its high extraction and production costs. Therefore, titanium is increasingly used in sectors with high demand, such as the aerospace industry or the production of biomedical devices, where the final high cost is not a major factor. It is believed that processing titanium and its alloys using powder metallurgy (PM) methods is a significant way to reduce the cost of manufacturing titanium products. It also provides the opportunity to develop new alloys that are difficult to obtain using traditional technologies. This work is devoted to processing titanium powder from biomedical production waste using various PM methods. It aims to research the processing of almost pure, chemically homogeneous, and finegrained titanium-based components. In particular, the main properties that can be achieved (porosity, microstructure, and mechanical properties) and the creation of highly efficient porous materials by advanced methods of isostatic pressing are presented.