| 简介 |
PROBLEM TO BE SOLVED : To provide : a rare earth magnet manufacturing method superior in magnetic property; and a rare earth magnet.
SOLUTION : A rare earth magnet manufacturing method comprises : a preparation step for quenching an alloy molten metal including Sm and Fe in the proportion of 1 : 8.75 to 1 : 12 on an atomic ratio basis to prepare a Sm-Fe based alloy having a SmFe9+α phase as a main phase; a hydrogenation step for separating, in phase, part of the SmFe9+α phase (α=0.1-3.0) into SmH2 and Fe by performing a hydrogenation treatment on the Sm-Fe based alloy; a molding step for press-molding the Sm-Fe based alloy subjected to the hydrogenation into a mold; a dehydrogenation step for performing a dehydrogenation treatment on the mold for recombining the SmH2 and Fe resulting from the phase separation by the hydrogenation treatment; and a nitration step for performing a nitriding treatment on the mold subjected to the dehydrogenation treatment. In the preparation step, with the Sm-Fe based alloy, the cumulative intensity ratio of a cumulative intensity Int(Fe) of a diffraction peak of αFe (110)plane in X-ray diffraction to a cumulative intensity Int(SmFe) of the maximum diffraction peak in a range of 2θ=30-50° is 1/9 or less.
SELECTED DRAWING : Figure 3
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