METHOD FOR PRODUCING METAL POWDERS OR GRANULES Russian patent published in 2021 - IPC B22F9/10 B22F9/14 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, powder metallurgy and additive manufacture. The workpiece 7 is rotated at a frequency of 10,000 to 32,000 rpm and an end thereof is melted by a plasma jet 3 obtained by ionisation of gas using a plasma torch 4 installed with an eccentricity k of the axis thereof relative to the axis of rotation of the workpiece 7 when a power from 70 to 140 kW is directed to the plasma torch 4. The nozzle of the plasma torch 4 has a cone opening angle from 11° to 50° and a cut diameter from 0.1 to 0.97 of the diameter d of the workpiece. Located inside the nozzle is a conical sleeve made of a refractory metal. The distance h is maintained in the process of melting between the end of the workpiece and the end of the nozzle of the plasma torch 4 in the range from 10 to 35 mm. Located on the outer surface of the refractory metal sleeve are notches providing a mechanical bond with the body of the nozzle of the plasma torch 4.

EFFECT: uniformity of the granulometric composition of the produced metal powders or granules and quality thereof are increased due to the eliminated contamination by particles of copper which is the material of the body of the nozzle, the particle size is reduced.

2 cl, 2 dwg, 2 tbl