South-West State University (Kursk, Russia)

E. V. Ageev, Dr. Eng., Prof., Dept. of the Materials Technology and Transport, Head of the Scientific and education
Center “Powder Metallurgy and Functional Coatings”, e-mail: ageev_ev@mail.ru
E. V. Ageeva, Dr. Eng., Associate Prof., Dept. of the Materials Technology and Transport, e-mail: ageeva-ev@yandex.ru
A. Yu. Altukhov, Cand. Eng., Associate Prof., Head of the Dept. of Materials Technology and Transport, e-mail: ail997@yandex.ru

The paper considers the issues of obtaining iron-chromium-nickel powders via electrodispersing of metal wastes of the alloy Kh25N20 in distilled water. The electroerosive processing method is characterized by waste-free, energyefficient and environmental friendly process. However, this method is rarely used in the industry due to the little knowledge of the structure and properties of the obtained raw materials. The aim of this work was to study the structure and properties of iron-chromium-nickel powders obtained via electrodispersing of metal wastes of the alloy Kh25N20 in distilled water. The pieces of the alloy Kh25N20 were preliminarily cut into 2–3 cm pieces at an experimental unit for consequent recycling of metal wastes of this alloy via the method of electroerosive dispersion. These pieces were loaded into a reactor filled with distilled water as a working liquid. The following electrical parameters of the unit were used: voltage at the electrodes 120–140 V; capacity of condensers 62.5–65.0 μF; impulse frequency 100–120 Hz. Based on the conducted researches aimed on studying the structure and properties of ironchromium-nickel powders, which were obtained via electroerosive dispersion of metal wastes of the alloy Kh25N20, the following results have been established: the shape of the powder particles is mainly spherical and elliptical; oxygen is contained on the surface of the powder particles, while all other elements (iron, nickel and chromium) are distributed relatively uniformly; powder particles have sizes from 0.1 up to 100.0 μm with an average volumetric diameter 64.9 μm; powder particles include the phases Fe₃O₄, Fe₃Ni₂ and Cr. Analysis of the results of the conducted researches showed that the physico-chemical properties of the obtained iron-chromium-nickel powder are influenced by the chemical composition of the working fluid, as well as by the modes of electrodispersing. It is possible to obtain powder with various sizes by varying the technological parameters of the unit.

The research was implemented within the framework of the State Assignment No. 075-03-2025-526 for 2025.

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