| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of a high density rare-earth magnet 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 Sm-Fe-based alloy of 25 μm thick or less, having a Sm-Fe phase as a main phase, a pulverization step of pulverizing a foil of Sm-Fe-based alloy, and obtaining powder of flaky Sm-Fe-based alloy passed through a sieve mesh having an opening of two times or more of the thickness of the foil, a hydrogenation step of hydrogenating the Sm-Fe-based alloy, a blending step of blending a solid lubricant to the hydrogenated Sm-Fe-based alloy and obtaining mixed powder, a molding step of obtaining a hydrogenation compact by pressure molding the mixed powder, a dehydrogenation step of obtaining a dehydrogenation compact by dehydrogenating the hydrogenation compact, and a nitriding step of obtaining a magnet molding having a Sm-Fe-N phase as a main phase, by heat treating and nitriding the dehydrogenation compact in a nitrogen-containing atmosphere. SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT |
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