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1. (WO2018163967) MAGNETIC POWDER CONTAINING SM-FE-N CRYSTAL GRAINS, SINTERED MAGNET PRODUCED FROM SAME, METHOD FOR PRODUCING SAID MAGNETIC POWDER, AND METHOD FOR PRODUCING SAID SINTERED MAGNET

Pub. No.:    WO/2018/163967    International Application No.:    PCT/JP2018/007849
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Fri Mar 02 00:59:59 CET 2018
IPC: H01F 1/059
B22F 1/00
B22F 3/00
B22F 3/14
B22F 9/04
C22C 33/02
H01F 41/02
C22C 38/00
Applicants: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
国立研究開発法人産業技術総合研究所
MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: TAKAGI, Kenta
高木 健太
YAMAGUCHI, Wataru
山口 渡
YOKOYAMA, Takaaki
横山 貴章
SAKAGUCHI, Kenji
坂口 健二
YOSHII, Kazuhiro
吉井 和弘
YOKOYAMA, Yuji
横山 裕史
Title: MAGNETIC POWDER CONTAINING SM-FE-N CRYSTAL GRAINS, SINTERED MAGNET PRODUCED FROM SAME, METHOD FOR PRODUCING SAID MAGNETIC POWDER, AND METHOD FOR PRODUCING SAID SINTERED MAGNET
Abstract:
The purpose of the present invention is to provide: a sintered magnet which contains Sm-Fe-N crystal grains and has high coercivity; and a magnetic powder which is capable of forming a sintered magnet without lowering the coercivity even if heat is generated in association with the sintering. A sintered magnet which comprises a crystal phase that is composed of a plurality of Sm-Fe-N crystal grains and non-magnetic metal phases that are present between adjacent Sm-Fe-N crystal grains, and wherein the ratio of the Fe peak intensity IFe to the SmFeN peak intensity ISmFeN as determined by an X-ray diffraction method is 0.2 or less. A magnetic powder which contains Sm-Fe-N crystal grains and non-magnetic metal layers that cover the surfaces of the Sm-Fe-N crystal grains.