METHOD FOR PREPARING R-FE-B-BASED RARE EARTH MAGNETIC POWDER FOR A BONDED MAGNET, MAGNETIC POWDER P

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The present invention relates to a method for preparing R-Fe-B-based rare earth magnetic powder for a bonded magnet, to magnetic powder prepared by the method, to a method for producing a bonded magnet using the magnetic powder, and to a bonded magnet produced by the method. More particularly, the present invention relates to a method for preparing R-Fe-B-based rare earth magnetic powder having improved magnetic properties, to magnetic powder prepared by the method, to a method for producing a bonded magnet using the magnetic powder, and to a bonded magnet produced by the method. The method for preparing R-Fe-B-based rare earth magnetic powder comprises : a step (step 1) of coarsely grinding sintered rare-earth magnet products serving as raw materials; a hydrogenating step (step 2) of filling an evacuated tube furnace with the ground products obtained in step 1, filling the tube furnace with hydrogen, and raising the temperature of the tube furnace; a phase decomposition step (step 3) of further raising the temperature of the tube furnace under a hydrogen atmosphere that is the same as that of step 2; a hydrogen-emitting step (step 4) of discharging the hydrogen of step 3 from the inside of the tube furnace; and a rebonding step (step 5) of evacuating the hydrogen pressure by vacuum from the inside of the tube furnace after finishing step 4.