Method for preparing R-Fe-B-based rare earth magnetic powder for a bonded magnet, magnetic powder prepared by the method, method for producing a bonded magnet using the magnetic powder, and bonded magnet produced by the method

摘要

A method of preparing R—Fe—B-based rare earth magnetic powder for a bonded magnet and magnetic powder prepared thereby, and a method of manufacturing a bonded magnet using magnetic powder and a bonded magnet manufactured thereby. Further, a method of preparing R—Fe—B-based rare earth magnetic powder having improved magnetic properties including grinding rare earth sintered magnet products as a raw material, performing a hydrogenation process where a ground product is charged into a furnace, and the furnace is then filled with hydrogen and a temperature of the furnace is increased, performing a disproportionation process where the temperature of the furnace is further increased in the same hydrogen atmosphere above, performing a desorption process where hydrogen is exhausted from an inside of the furnace, and performing a recombination process where hydrogen in the inside of the furnace is exhausted, and magnetic powder prepared thereby, and a method of manufacturing a bonded magnet.

主权项

1. A method of preparing R—Fe—B-based rare earth magnetic powder having improved magnetic properties, the method comprising:
coarse grinding rare earth sintered magnet products as a raw material; performing a hydrogenation process in which a ground product obtained through the coarse grinding is charged into a tube furnace, and the tube furnace is then filled with hydrogen and a temperature of the tube furnace is increased; performing a disproportionation process in which the temperature of the tube furnace is further increased in the same hydrogen atmosphere as that of the hydrogenation process; performing a desorption process in which hydrogen is exhausted from an inside of the tube furnace; and performing a recombination process in which hydrogen in the inside of the tube furnace is vacuum exhausted after the desorption process is performed, wherein the recombination process is performed after the desorption process and the disproportionation process and desorption process are repeated one time.