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1. (WO2018101410) RARE EARTH PERMANENT MAGNET

Pub. No.:    WO/2018/101410    International Application No.:    PCT/JP2017/043076
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Fri Dec 01 00:59:59 CET 2017
IPC: H01F 1/058
C22C 33/02
C22C 38/00
Applicants: TDK CORPORATION
TDK株式会社
Inventors: HASHIMOTO, Ryuji
橋本 龍司
ITO, Masashi
伊藤 将志
FUKUCHI, Eiichiro
福地 英一郎
NAGAMINE, Yuki
永峰 佑起
Title: RARE EARTH PERMANENT MAGNET
Abstract:
[Problem] To provide a rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure having strong coercive force. [Solution] A rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure, wherein when the composition ratio of the rare earth permanent magnet is expressed as RaT(100-a-b)Cb, where R is one or more rare earth elements requiring Sm, and T is one or more transition metal elements requiring Fe or Fe and Co, a and b satisfy 18 < a < 40 and 0.5 ≤ b, and a phase where R and C are denser than the main phase is provided in the grain boundary phase of the rare earth permanent magnet.