PRODUCTION METHOD OF RARE EARTH-IRON-NITROGEN SYSTEM ALLOY POWDER

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PROBLEM TO BE SOLVED : To provide a production method of a rare earth-iron-nitrogen system alloy powder having excellent magnetic characteristics by preparing single crystal particles having small crystal distortion, less fine powder and uniform particle sizes. SOLUTION : A production method of a rare earth-iron-nitrogen system alloy powder includes : a step 1 of preparing a mixture of a rare earth oxide powder and an iron powder as a starting raw material; a step 2 for performing a reduction diffusion treatment in an inert gas with a predetermined amount of calcium metal added; a step 3 of supplying a mixed gas of ammonia and hydrogen to perform a nitrogen treatment of reduction diffusion treated product in the air flow at a predetermined temperature; and a step 4 of charging a nitride treatment product block in water to treat in wet to break, the obtained magnet crude powder is cracked to obtain a cracked powder having a specific half-value width of a (113) plane and a specific rate of fine powder of less than 1 μm. SELECTED DRAWING : None COPYRIGHT : (C)2018, JPO&INPIT