MANUFACTURING METHOD OF REAR EARTH-IRON-NITROGEN-BASED ALLOY POWDER

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PROBLEM TO BE SOLVED : To provide a manufacturing method of a rare earth-iron-nitrogen-based magnetic powder capable of providing a magnetic powder having excellent magnetic properties by using a reduction diffusion method with suppressing generation of coarse particles and generation of projection of a breaking surface or crystal distortion which may become a core of a reverse magnetic domain reducing magnetic properties by a magnetic crystal. SOLUTION : There is provided a manufacturing method of a rare earth-iron-nitrogen-based magnetic powder including a process for nitriding a rare earth-iron-based base alloy powder capable of being obtained by a reduction diffusion method, and there is provided a manufacturing method of a rare earth-iron-nitrogen-based magnetic powder having a first process for conducting a wet mixing treatment on an iron compound powder and a rare earth compound powder as magnetic raw materials in water or an organic solvent, selecting the magnetic raw material from a treatment liquid having sum of chlorine ion concentration of 0.1 wt.% or less and drying the same, and a second process for conducting a heat treatment on the resulting mixed powder in a steam flow to make production amount of rare earth iron composite oxide RFeO3, where R is a rear earth element, in the resulting reduction mixture powder at 6 wt.% or less. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2018, JPO&INPIT