METHOD OF PRODUCING POWDER OF SINGLE-PHASE HIGH-ENTROPY DIBORIDE OF COMPOSITION Ti-Zr-Nb-Hf-Ta-B WITH HEXAGONAL LATTICE Russian patent published in 2025 - IPC C01B35/04 B22F9/14 B22F9/16 C04B35/58 C04B35/626 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to powder metallurgy and can be used for production of refractory materials. Method of single-phase high-entropy diboride with hexagonal lattice involves mixing of initial powders of titanium Ti, zirconium Zr, niobium Nb, hafnium Hf, tantalum Ta and boron B in a ball mill in a grinding barrel made of tungsten carbide with two balls of tungsten carbide for 6 hours in air with addition of 0.05 g of stearic acid. Obtained mixture in amount of 5.2-6.3 g is placed on the bottom of a first graphite cup, covered with a graphite cover and coaxially placed in a second graphite barrel of a larger size which is the cathode. Direct-current arc discharge is generated in air by contacting three anodes in the form of solid graphite rods with upper surface of graphite cover at current strength of 150-200 A for 60-120 s. Then anodes are diverted vertically upwards, thus interrupting burning of arc discharge. After cooling, porous sinter is removed from the first barrel and crushed in an agate mortar.

EFFECT: invention allows obtaining powder of high-entropy diboride with hexagonal lattice, which contains titanium, zirconium, niobium, hafnium and tantalum, in one cycle of arc discharge action in air medium.

1 cl, 9 dwg, 1 tbl, 4 ex