Influence of Modes of Electrospark Treatment on Formation of Solid Solutions in Alloys of Copper with Iron and Cobalt

Issues » Volume 40, Issue 3

V. M. Nadutov, A. O. Perekos, B. M. Mordyuk, V. Z. Voynash, T. V. Efimova, V. P. Zalutsky, T. G. Kabantsev

G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 18.01.2018. Download: PDF

The structure, phase composition, dispersion, and magnetic properties of fine powders of copper with iron and cobalt obtained by electrospark method in distilled water, ethanol, and kerosene are investigated by X-ray analysis, electron microscopy and magnetometry methods. As shown, oversaturated solid solutions of copper with iron and cobalt as well as their oxides (CoO, Cu$_2$O, FeO) and carbides (Co$_3$C, Fe$_2$C, Fe$_3$C) are formed in powder blends during electrospark treatment. The quantities of oxides and carbides essentially depend on the type of working liquid. As shown, electrospark treatment leads to considerable structure changes, particle shape becomes near spherical, and their sizes are within the range from 1 to 10 $\mu$m. Concentrations of metals in solid solutions after electrospark treatment exceed much (by 2–3 orders of magnitude) the equilibrium values of concentrations for these systems in bulk specimens. Magnetic properties of fine powders of the Cu–Co and Cu–Fe alloys are determined by their phase composition and dispersity, which depend on the working liquid.

Key words: finely dispersed powders, magnetic properties, X-ray structural analysis, electron microscopy, magnetic measurements.

URL: http://mfint.imp.kiev.ua/en/abstract/v40/i03/0327.html

DOI: https://doi.org/10.15407/mfint.40.03.0327

PACS: 61.43.Gt, 61.72.Dd, 68.37.Hk, 75.50.Tt, 81.07.Wx, 81.20.Ev, 81.40.Rs

Citation: V. M. Nadutov, A. O. Perekos, B. M. Mordyuk, V. Z. Voynash, T. V. Efimova, V. P. Zalutsky, and T. G. Kabantsev, Influence of Modes of Electrospark Treatment on Formation of Solid Solutions in Alloys of Copper with Iron and Cobalt, Metallofiz. Noveishie Tekhnol., 40, No. 3: 327—338 (2018) (in Ukrainian)

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