METHOD FOR PRODUCING SINTERED R-IRON-BORON MAGNET

A method for producing a sintered R-iron (Fe)-boron (B) magnet, the method including : (1) producing a sintered magnet R1-Fe-B-M; (2) washing the sintered magnet using an acid solution and deionized water, successively, and drying the sintered magnet to yield a treated magnet; (3) mixing a heavy rare earth element powder RX, an organic solid powder EP and an organic solvent ET to yield a slurry RXE, coating the slurry RXE on the surface of the treated magnet, and drying the treated magnet to yield a treatment unit; and (4) heating, quenching, and then aging the treatment unit.