Browsing by Author "Stovpchenko, Ganna"

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    Influence of Surfactants on Copper-CNTs Electrodeposition
    (Lviv Polytechnic National University, Lviv, Ukraine, 2021) Roslyk, Iryna; Stovpchenko, Ganna; Galchenko, Galyna
    ENG: Influence of different types of surfactants on electrodeposition of copper- and carbon-bearing (graphite, carbon nanotubes (CNTs)) composite powder has been experimentally investigated. The size of powder particles decreased, and corrosion resistance increased when surfactants were added. Addition of cationic surfactant CTAB to the electrolyte with simultaneous ultrasonic treatment for CNTs dispersion gives maximum effect.
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    Phenomena at Three-Phase Electroslag Remelting
    (Springer Nature, 2021) Liu, Zhong-li; Medovar, Lev; Stovpchenko, Ganna; Petrenko, Volodymyr; Sybir, Artem; Volchenkov, Yev.
    ENG: The electroslag remelting (ESR) process is widely used to produce high-quality ingots and billets for high-alloyed steels and alloys. Both the single-phase and three-phase alternating current diagram with bifilar and monofilar connection are in use for heavy ingot manufacturing. The numerical simulation of the three-phase bifilar circuit for the 120 t three-phase bifilar six-electrode ESR furnace at different variants of electric connection was presented and discussed. At the bifilar diagram of power supply, the geometrical location of electrodes in a mould holds critical importance for performances: the close location of bifilar pair electrodes provides the highest heat productivity, but the equidistant location of electrodes gives a much more uniform heat distribution. The monofilar mulit-electrode diagram of three-phase connection without phase shift shows the most uniform distribution of potential and heat generation as well as a favorable magnetic field that makes this kind the most promising for providing a high quality of heavy ingots.