Alloy powder and preparation method therefor

A method for manufacturing of a metal alloy powder comprising:

• mixing a plurality of metal compounds to form a mixture;
• and
• heat-treating the mixture having the plurality of metal compounds,
• wherein in the heat-treating the mixture, a process temperature varies according to a particle diameter of the metal alloy powder, and a relationship between the process temperature and the particle diameter is positive,
• wherein the plurality of metal compounds include at least one of cobalt (Co), copper (Cu), iron (Fe), nickel (Ni), or ruthenium (Ru),
• wherein the plurality of metal compounds include a metal salt of at least one of chloride, carbonate, nitrate, halide, sulfate, acetate, acetylacetonate, or perchlorate,
• wherein the heat-treating the mixture having the plurality of metal compounds comprises:
• controlling the process temperature to a first reaction temperature for the mixture at a first temperature of over 400° C. to 500° C.;
• setting the process temperature according to the particle diameter;
• and
• controlling the process temperature to a second reaction temperature for a plurality of reduced metal compounds at a second temperature of 500° C. to 700° C.,
• wherein the heat-treating the mixture is performed in a hydrogen gas atmosphere,
• wherein the metal salt comprises the chloride, and the metal salt is reduced by reaction Formula 1 and reaction Formula 2:
• MCl2 (M=Co,Cu,Fe,Ni)
• MCl2+H2=M+2HCl Formula 1:
• MCl3 (M=Ru)
• 2MCl3+3H2=2M+6HCl Formula 2:
• to form a reduced metal alloy powder comprising CoCuFeNiRu having an atomic ratio of cobalt, copper, iron, nickel and ruthenium of 1:1:1:1:1, and
• wherein the particle diameter of the metal alloy powder is 80 nm to 700 nm.