Southwest 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., Dept. of the Materials Technology and Transport, e-mail: ail1997@yandex.ru

The paper considers the issues of obtaining iron-chromium-nickel powders via electrodispersing of metal wastes of the alloy Kh25N20 in isopropyl alcohol. The electroerosive processing method is characterized by waste-free, energy-efficient 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 isopropyl alcohol. 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 160–220 V; capacity of condensers 40–50 µF; impulse frequency 150–220 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 in isopropyl alcohol, the following results have been established: the shape of the powder particles is mainly spherical and elliptical; carbon and oxygen are found on the surface of the powder particles, while all other elements (iron, nickel, chromium and manganese) are distributed relatively uniformly; powder particles have sizes from 0.1 up to 100.0 µm with an average volumetric diameter 24.4 µm; powder particles include the phases Ni₃С, Fe₃С, Fe₃Ni₂ and Cr. Use of electroerosive dispersion technology makes it possible to solve the problem of obtaining small batches of spherical iron-chromium-nickel powders of the required fractional composition with minimal energy consumption and minimal damage to the environment. The resulting electroerosive iron-chromium-nickel powders can be effectively used in the production of heat-resistant alloys and coatings.

The research was carried out within the framwork of the State assignment “Strucrured metallic-based and ceramic-based micro- and nanomaterials for biomedicine and industrial material science” (FENM-2025-0008). Registrating number 1024031900124-7-1.3.2.

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21. Ageeva E. V., Ageeva A. E., Ageev E. V. The method for obtaining chromium-nickel powders from Kh25N20 alloy wastes in distilled water. RF Patent No, 2824009 S 1, MPK B22F 9/14, B232H 1/00. Application No. 2024106401. Applied 12.03.2024, published 31.07.2024.