| 摘要 |
PROBLEM TO BE SOLVED: To provide the manufacturing method of rare-earth magnet powder having a recrystallized texture of R2 T14 M type intermetallic compound phase and excellent magnetic anisotropy. SOLUTION: A hydrogen storage treatment is performed on a Mg-containing R-T-M-A-Mg alloy raw material, and after the temperature has been raised from room temperature to 500 deg.C in a vacuum or inert gas atmosphere, the temperature is raised to 500 to 1000 deg.C in a hydrogen atmosphere or in the mixed gas atmosphere of hydrogen and inert gas and the temperature is maintained in that state. As a result, hydrogen is stored into the above-mentined R-T-M-A-Mg alloy raw material, a hydrogen storage treatment is performed for the purpose of accelerating phase transformation. Subsequently, by maintaining the R-T-M-A-Mg raw material in the vacuum atmosphere of less than 1Torr at the prescribed temperature of 500 to 1000 deg.C, hydrogen is forcedly discharged from the R-T-M-A-Mg alloy raw material, and it is cooled and crushed after conducting a dehydrogenation treatment which accelerates phase transformation. |
