Influence of Ultrasonic Processing in a Ball Mill on Phase-Structural Characteristics of Superfine Powder Blends of Copper with Iron and Cobalt
V. M. Nadutov, A. O. Perekos, B. M. Mordyuk, V. Z. Voinash, 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: 11.01.2018. Download: PDF
Influence of ultrasonic treatment (UST) in a ball mill on structure-phase characteristics and magnetic properties of superfine powder mixtures (SFPM) of copper with iron and cobalt (Cu+Co and Cu+Fe) is investigated by x-ray analysis and magnetic methods. As shown, the UST of SFPM results in decreasing of the Co‒Cu and $\alpha$-Fe‒Cu ferromagnetic phases’ quantity as well as increasing of oxides’ quantity. Dispersity of phase components is in interval 20–50 nm, and concentrations of metals in the Co‒Cu and $\alpha$-Fe‒Cu solid solutions do not change almost. Variations of magnetic properties of SFPM after UST correspond to changing of their phase composition and dispersity: specific saturation magnetization decreases from 64 to 35 A$\cdot$m$^2$/kg, coercivity increases from 2.0 to 20.0 kА/m, and residual magnetization increases from 7.2 to 48.3 mT. As supposed, the peculiarities of structure-phase characteristics of SFPM fabricated by means of the UST are conditioned by presence of the oxide and carbide coatings on particles’ surfaces.
Key words: ultrafine powders blends, electric-spark treatment, ultrasonic milling, x-ray structural analysis, magnetic measurements, magnetic properties.
URL: http://mfint.imp.kiev.ua/en/abstract/v40/i04/0501.html
DOI: https://doi.org/10.15407/mfint.40.04.0501
PACS: 75.50.Tt, 75.75.Cd, 81.07.Wx, 81.20.Ev, 81.20.Wk, 81.40.Rs, 81.70.Jb
Citation: V. M. Nadutov, A. O. Perekos, B. M. Mordyuk, V. Z. Voinash, T. V. Efimova, V. P. Zalutsky, and T. G. Kabantsev, Influence of Ultrasonic Processing in a Ball Mill on Phase-Structural Characteristics of Superfine Powder Blends of Copper with Iron and Cobalt, Metallofiz. Noveishie Tekhnol., 40, No. 4: 501—514 (2018) (in Ukrainian)