| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of rare-earth magnet having high density and excellent in shape retention, and to provide a rare-earth magnet. SOLUTION : A manufacturing method of rare-earth magnet includes a preparation step of preparing a foil of Nd-Fe-B based alloy of 25 μm or less having a Nd-Fe-B phase as a main phase, a pulverization step of pulverizing foils of the Nd-Fe-B based alloy and obtaining flaky powder P thereof passed through the sieve mesh having an opening of two times or more of the thickness of the foils, a hydrogen treatment step of hydrogenating the Nd-Fe-B based alloy, a blending step of blending a solid lubricant to the powder of the Nd-Fe-B based alloy subjected to hydrogen treatment and obtaining mixed powder, a molding step of obtaining a hydrogenation compact by pressure molding the mixed powder, and a dehydrogenation step of obtaining a magnet molding having a Nd-Fe-N phase as a main phase, by performing dehydrogenation processing of the hydrogenation compact. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2019, JPO&INPIT |
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