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 mix is placed on magnet body surface and features composition R¹ -Fe-B, where R¹ is, at least, one of rare-earth elements including Sc and Y. Powder mix comprises powder containing, at least, 0.5 wt % of M with mean particle size not exceeding 300 mcm, and powder containing, at least 30 wt % of R² fluoride with particle size not exceeding 100 mcm, where M is, at least, one element from the group including Al, Cu and Zn, R² is, at least, one element of rare earth metals including Sc and Y. Magnet with powder mix is subjected to thermal treatment at temperature not exceeding that of magnet body sintering in vacuum or inert gas to allow absorption of, at least, M or R² in magnet body.

EFFECT: R¹-Fe-B sintered magnet features high operating properties at minimum amount of used Tb or Dy.

12 cl, 8 tbl, 8 ex