Ods alloy powder, method for producing same by means of plasma treatment, and use thereof

A method for producing a powder of a reinforced alloy for which grains forming particles of the powder comprise a metal matrix, in a volume of which crystalline oxide particles are dispersed, said method comprising:

• i) providing a powder mixture, comprising:
• a parent metal powder comprising a master alloy intended to form the metal matrix, the master alloy being selected from the group consisting of an iron-based alloy, a nickel-based alloy and an aluminum-based alloy;
• an additional powder comprising at least one intermediate intended to incorporate, in the metal matrix, atoms intended to form dispersed oxide particles;
• the intermediate intended to form the dispersed oxide particles being at least one selected from the group consisting of YFe3, Y2O3, Fe2O3, Fe2Ti, FeCrWTi, TiH2, TiO2, Al2O3, HfO2, SiO2, ZrO2, ThO2, and MgO,
• ii) milling the powder mixture in a gaseous milling medium according to a mechanical synthesis process for making a precursor powder comprising a metal matrix incorporating said atoms;
• iii) subjecting the precursor powder to a thermal plasma generated by a plasma torch comprising a plasma gas, in order to obtain reinforced alloy powder, the precursor powder being injected into the plasma torch at a flow rate between 10 grams/min and 30 grams/min, a power of the plasma torch being between 20 kW and 40 kW, and a pressure in a reaction chamber of the plasma torch being between 25 kPa and 100 kPa.