METHOD FOR MANUFACTURING RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To provide a method for manufacturing a rare earth magnet high in relative density and superior in magnetic property. SOLUTION : A method for manufacturing a rare earth magnet comprises : a preparation step for preparing Sm-Fe based alloy powder having a main phase of a Sm-Fe based compound including Sm and Fe; a coating step for coating surfaces of particles of the Sm-Fe based alloy powder with a non-magnetic metal material; a thermal treatment step for performing a thermal treatment on the Sm-Fe based alloy powder coated with the metal material to form a surface layer including a metal element of the metal material for a surface layer of each of particles of the powder; a nitration step for obtaining Sm-Fe-N based alloy powder having a main phase of a Sm-Fe-N based compound by performing a nitriding treatment on the Sm-Fe based alloy powder with the surface layer formed thereon in a magnetic field to nitride the Sm-Fe based compound of the main phase; and a molding step for molding the Sm-Fe-N based alloy powder in a compression manner in a magnetic field to obtain a Sm-Fe-N based magnet. COPYRIGHT : (C)2015, JPO&INPIT