Method for manufacturing a rare earth magnetic powder having high magnetic anisotropy

摘要

An R-T-M alloy material, wherein R is at least one rare earth metal including Y, T is Fe or an Fe component partially replaced by Co or Ni, M is B or a B component partially replaced by C as primary components is prepared by heating the alloy at a temperature from room temperature to a specific temperature of less than 500 DEG C. in a non-oxidizing atmosphere and holding it at the given temperature, if necessary; performing hydrogenation by holding the alloy in a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and an inert gas at a specific temperature in the range of 500-1,000 DEG C.; medial annealing the alloy by holding the R-T-M alloy after the hydrogenation step in an inert gas atmosphere at a specific temperature in the range of 500-1,000 DEG C.; and dehydrogenating the alloy by holding the alloy in a vacuum of less than 1 Torr for dehydrogenation, and then cooling the alloy.