METHOD FOR OBTAINING CARBIDE POWDER OF A HIGH-ENTROPY ALLOY WITH A SPHERICAL PARTICLE SHAPE

摘要

FIELD: powder metallurgy. ;SUBSTANCE: invention relates to powder metallurgy and processing of non-ferrous metals and can be used in additive technologies to create high-quality end products of complex shape and in the production of ceramic ware. 4-6 initial elemental powders from the Ti, V, Zr, Nb, Hf, Ta, W, Mo series with a purity of at least 99.5% in an equiatomic ratio are taken and mixed in a gravity mixer in air. The resulting mixture is placed in a planetary mill or attritor with the addition of a grinding agent: ethanol, isopropanol or polymethylmethacrylate, and grinding balls with a diameter of 5-15 mm, with a mass ratio of the mixture to the grinding balls (1:10)-(1:40), accordingly. After that, mechanical alloying is carried out for 1-50 hours in an argon atmosphere at the rotation speed of the main disk of the planetary mill 100-400 rpm and its cups 100-1200 rpm or at the rotation speed of the attritor stirrer 100-600 rpm. The formed high-entropy alloy, homogeneous in chemical composition, is dried in vacuum at 90-130°C for 1-2 hours, cooled in air to ambient temperature and filtered out from grinding balls. Further, fractions of 15-63 and 63-125 mcm are isolated from the powder. Then low-temperature plasma spheroidization and carbidization are carried out, using as a working atmosphere a plasma jet of argon-acetylene mixture, which is a plasma-forming gas. ;EFFECT: resulting melt droplets are cooled in a carrier gas jet, namely argon; the formed particles of ultra-high-temperature high-entropy carbide powder have a spherical or rounded shape with a shape factor of no more than 1.6 and a size of 20-120 mcm, and are characterized by high fluidity and zero porosity. ;6 cl