METHOD OF PRODUCING RARE-EARTH PERMANENT MAGNET MATERIAL Russian patent published in 2011 - IPC B22F3/24 H01F1/53 C22C1/04 

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy, particularly, to materials intended for production of rare-earth permanent magnets. Powder is placed on magnet body surface and features composition R¹ _aT_bA_cM_d, where R¹ is rare-earth element including Sc and Y, T - Fe and/or Co, A - boron and/or carbon, M -Al, Cu, Zn, In, Si, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta or W. Powder comprises R² oxide, R³ fluoride or R⁴ oxifluoride where R², R³ and R⁴ are rare-earth elements including Sc and Y, and has mean particle size of not over 100 mcm. Thermal treatment of magnet body and powder is conducted at temperature equal to or smaller than magnet body sintering temperature to allow absorption of R², R³ and R⁴ into magnet body. Absorption treatment is performed, at least, two times.

EFFECT: sintered magnet R-Fe-B with high operating properties.

14 cl, 1 tbl, 6 ex