Synthesis of Ultrafine Tungsten-Based Powders by Reduction in Hydrogen
N. F. Kushchevska, M. G. Zaliubovskyi, V. V. Malyshev
Open International University of Human Development ‘Ukraine’, 23 Lvivska Str., UA-03115 Kyiv, Ukraine
Received: 27.05.2020; final version - 08.12.2020. Download: PDF
Method for obtaining ultrafine powders on the base of tungsten is developed. Synthesis regimes allowing to obtain the powders on the base of tungsten with a given set of properties are elaborated. For the synthesis of tungsten-based powders with a given composition, a method combining chemical deposition of metal hydroxides from solutions of the corresponding salts to obtain metal oxides with their subsequent reduction in hydrogen is used. An intermediate for the production of tungsten-based powders is obtained in two methods. According to the first method, the product is fabricated by mechanical mixing of nickel, iron, and cobalt hydroxides with tungstic acid. The second one is carried out by mixing tungstic acid with aqueous solutions of nickel, iron, and cobalt salts with the subsequent evaporation of the mixture to dryness with continuous stirring and washing with acetone or alcohol to remove chlorine anions. The following characteristics of doped powders on the base of tungsten are studied: chemical and phase compositions, distributions of sizes of particles and their agglomerates.
Key words: chemical deposition, reduction in hydrogen, ultrafine tungsten-based powders, chemical composition, phase composition.
PACS: 61.05.сp, 61.46.Df, 61.72.S-, 81.07.Bc, 81.10.Dn, 81.70.Jb
Citation: N. F. Kushchevska, M. G. Zaliubovskyi, and V. V. Malyshev, Synthesis of Ultrafine Tungsten-Based Powders by Reduction in Hydrogen, Metallofiz. Noveishie Tekhnol., 43, No. 2: 173—181 (2021) (in Ukrainian)