METHOD FOR PRODUCING SPHERICAL POWDER OF HIGH-ENTROPY ALLOY BORIDE Russian patent published in 2023 - IPC B22F9/04 B22F9/02 B22F9/14 C01B35/04 C22C1/53 

FIELD: powder metallurgy.

SUBSTANCE: invention is related to methods for producing powders of high-entropy borides of spherical shape for use in additive technologies and as ultra-high-temperature materials. At least 5 elemental powders from the series Ti, V, Zr, Nb, Hf, Ta, W, Mo with a purity of at least 99.5 wt.% are mixed in an equiatomic ratio in a sealed box in an inert atmosphere with argon purging, then loaded into the attritor and carry out mechanical alloying. The resulting powder is mixed with polycrystalline boron powder in a ratio of 1:2 in an attritor until a homogeneous mechanical mixture is obtained. A 2% aqueous solution of polyvinyl alcohol (PVA) is added to the mechanical mixture, and the mixture is loaded into a spray dryer. The granulated powder is subjected to low-temperature plasma spheroidization; an argon-hydrogen mixture is used as a plasma-forming gas.

EFFECT: obtaining single-phase, non-porous, ultra-high-temperature boride powder of a high-entropy alloy of spherical shape, with high fluidity, zero porosity, and a uniform specified chemical composition.

1 cl, 1 ex