METHOD FOR PRODUCTION OF HARD-MAGNETIC MATERIAL SmMN Russian patent published in 2016 - IPC H01F1/59 B22F1/00 

FIELD: technological processes.

SUBSTANCE: invention relates to production of magnetically hard materials, which can be used in electrical engineering and machine building. Method involves staged mixing the powders of iron, nitride-creating elements (NCE), such as Ti, Nb, Mo, and samarium to form a compound, for example, Sm₂Fe₁₆Ti, Sm₂Fe_16.5Nb_0.25, Sm₂Fe_16.5Mo_0.5. At the first stage the powders of iron and one or two nitride-creating elements Ti, Nb, Mo are mixed, then the mixture is subjected to mechanical alloying in an inert atmosphere without moisture content during 3-5 hours, at the second stage the obtained solid solution of iron and NCE is mixed with the powder of samarium and the obtained mechanical mixture is subjected to mechanical alloying in the reactor with an inert atmosphere without moisture content during 7-20 hours. During the mechanical alloying the reactor is blown with a mixture of ammonia and hydrogen NH₃ - 85-95 % and H₂ - 5-15 % for nitriding at the rate of 0.5-5 l/min. As the inert atmosphere argon, helium, etc. may be used.

EFFECT: proposed method of producing a hard-magnetic compound of Sm₂M₁₇N_x increases the coercitive force (H_c) and Curie temperature (T_c) of the end product, which is the technical result of the invention.

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