Title:
希土類−鉄−窒素系合金粉末の製造方法
Document Type and Number:
Japanese Patent JP6759855
Kind Code:
B2
Abstract:
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 RFeO, where R is a rear earth element, in the resulting reduction mixture powder at 6 wt.% or less.SELECTED DRAWING: Figure 1
Inventors:
Tetsu Matsumoto
Shinichi Hayashi
Nao Ishikawa
Shinichi Hayashi
Nao Ishikawa
Application Number:
JP2016163672A
Publication Date:
September 23, 2020
Filing Date:
August 24, 2016
Export Citation:
Assignee:
Sumitomo Metal Mining Co., Ltd.
International Classes:
B22F9/20; B22F1/00; B22F9/04; H01F1/059; H01F41/02
Domestic Patent References:
| JP2010270379A | ||||
| JP2010270382A |
Attorney, Agent or Firm:
Kazuya Nishi
Usami Aya
Usami Aya