METHOD FOR THERMOCHEMICAL TREATMENT OF METAL POWDERS FOR PRODUCING STEELS AND HEAT-RESISTANT ALLOYS HARDENED WITH DISPERSED OXIDES Russian patent published in 2022 - IPC B22F9/16 B22F1/00 C23C10/06 

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy, in particular, to a method for producing a composite powder for manufacturing products hardened with dispersed oxides. Said powder can be used in mechanical engineering, aerospace equipment, and nuclear engineering for manufacturing fuel rods from radiation-resistant stainless steels. An activated gaseous medium is preliminarily produced by thermal decomposition of a halide followed by interaction with saturating alloying elements, and fed into a container containing a powder of a radiation-resistant stainless steel or a heat-resistant alloy based on a solid solution of Fe-Ni-Cr. Thermochemical treatment is conducted in a vibrating fluidised bed by heating to a temperature above the evaporation temperature of the halide and below the melting temperature of the saturating alloying elements and sustaining at said temperature. Annealing is then executed in a hydrogen-containing medium and cooling in an oxygen-containing medium resulting in formation of oxides of saturating alloying elements on the surface of the base metal powder.

EFFECT: high level of hardening by dispersed oxides and structural stability of the material are ensured.

9 cl, 1 tbl, 3 ex, 6 dwg