METHOD OF PRODUCING POWDER ALLOYS OF SPHERICAL SHAPE BASED ON TITANIUM NICKELIDE FOR USE IN ADDITIVE TECHNOLOGIES Russian patent published in 2022 - IPC B22F9/04 B22F9/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy and metallurgy of non-ferrous metals, particularly to methods of producing powders based on titanium nickelide of spherical shape for general metallurgical applications and additive technologies. Method of producing spherical titanium nickelide powders involves mechanical grinding in an attritor in an argon atmosphere and subsequent low-temperature plasma spheroidization, wherein at the stage of mechanical grinding, the powder is mechanically alloyed by mixing Ti and Ni powders with purity of not less than 99.9 wt. % Ti - 49–50 at. %, Ni - 50–51 at. %, wherein the first batch of powder obtained in the attritor is removed, then a new batch of the mixture of powders is loaded and treated in the attritor with the addition of grinding bodies with size of 5–15 mm, with ratio of mass of mixture to grinding bodies 1:10–1:30 for 5–25 hours in atmosphere of argon with rotation speed of agitator from 200 to 270 rpm, powder is classified with separation of fractions of 15–63 and 63–125 mcm and melting is performed in low-temperature plasma jet in medium of argon and hydrogen gases and/or helium at power of high-frequency induction plasmatron from 10 to 15 kW, protective gas flow rate from 30 to 40 standard litres per minute, plasma-forming gas flow rate from 10 to 15 standard litres per minute, hydrogen flow rate from 3 to 4 standard litres per minute, pressure in chamber from 0.68 to 1.1 atm, carrier gas flow rate from 2 to 4 standard litres per minute, powder flow rate from 0.5 to 3.5 kg/h.

EFFECT: invention is aimed at obtaining pore-free NiTi powder with high degree of spheroidization.

3 cl, 1 ex