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1. (WO2018138841) SINTERED MAGNET MANUFACTURING METHOD

Pub. No.:    WO/2018/138841    International Application No.:    PCT/JP2017/002793
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Fri Jan 27 00:59:59 CET 2017
IPC: H01F 41/02
B22F 1/00
B22F 3/00
B22F 3/24
H01F 1/057
Applicants: NISSAN MOTOR CO., LTD.
日産自動車株式会社
Inventors: UENOHARA, Masaru
上之原 勝
SAKO, Michihiro
迫 道大
FURUYA, Takashi
古屋 崇
KAWAI, Seiji
河井 聖児
Title: SINTERED MAGNET MANUFACTURING METHOD
Abstract:
[Problem] To provide a method for manufacturing a sintered magnet having good yield and high coercive force. [Solution] This sintered magnet manufacturing method comprises subjecting an Nd-Fe-B sintered magnet as a base material to grain boundary diffusion processing using an alloy powder comprising a rare-earth element R, and then removing a residue existing on a surface of the sintered magnet that has been subjected to the grain boundary diffusion processing. The alloy powder is represented by RxAyBz, where R is at least one of rare-earth elements comprising Sc and Y; A is Ca or Li; B is an unavoidable impurity; 2 ≤ x ≤ 99; 1 ≤ y < x; and 0 ≤ z < y. The removal of the residue is performed by projecting a projectile material onto the surface of the sintered magnet.