| 简介 |
A method for producing a rare-earth magnet includes a provision step of providing a Sm—Fe-based alloy containing a SmFe9+α phase serving as a main phase by rapidly cooling a molten alloy containing Sm and Fe in an atomic ratio of 1 : 8.75 to 1 : 12, a hydrogenation-disproportionation step of subjecting the Sm—Fe-based alloy to hydrogenation-disproportionation treatment to allow part of the SmFe9+α phase (α=0.1 to 3.0) to undergo phase decomposition into SmH2 and Fe, a formation step of pressure-forming the Sm—Fe-based alloy that has been subjected to the hydrogenation-disproportionation treatment to provide a formed article, a desorption-recombination step of subjecting the formed article to desorption-recombination treatment to allow the SmH2 and the Fe provided by phase decomposition in the hydrogenation-disproportionation treatment to recombine, and a nitriding step of subjecting the formed article that has been subjected to the desorption-recombination treatment to nitriding treatment, in which when the Sm—Fe-based alloy obtained in the provision step is subjected to X-ray diffraction, the integrated intensity ratio of the integrated intensity Int(Fe) of a diffraction peak arising from the α-Fe(110) plane to the integrated intensity Int(SmFe) of a maximum diffraction peak arising from a compound of Sm and Fe is 1/9 or less in a range of 2θ=30° to 50°. |
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