Search International and National Patent Collections

1. (WO2014190558) RARE-EARTH PERMANENT MAGNETIC POWDERS, BONDED MAGNET COMPRISING SAME, AND DEVICE USING BONDED MAGNET

Pub. No.:    WO/2014/190558    International Application No.:    PCT/CN2013/076605
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Sat Jun 01 01:59:59 CEST 2013
IPC: H01F 1/01
H01F 1/058
H01F 1/059
H01F 1/06
H01F 1/08
Applicants: GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS
北京有色金属研究总院
GRIREM ADVANCED MATERIALS CO., LTD.
有研稀土新材料股份有限公司
LI, Hongwei
李红卫
LUO, Yang
罗阳
YU, Dunbo
于敦波
LI, Kuoshe
李扩社
YAN, Wenlong
闫文龙
LI, Shipeng
李世鹏
YUAN, Yongqiang
袁永强
PENG, Haijun
彭海军
Inventors: LI, Hongwei
李红卫
LUO, Yang
罗阳
YU, Dunbo
于敦波
LI, Kuoshe
李扩社
YAN, Wenlong
闫文龙
LI, Shipeng
李世鹏
YUAN, Yongqiang
袁永强
PENG, Haijun
彭海军
Title: RARE-EARTH PERMANENT MAGNETIC POWDERS, BONDED MAGNET COMPRISING SAME, AND DEVICE USING BONDED MAGNET
Abstract:
Disclosed are rare-earth permanent magnetic powders, a bonded magnet comprising same, and a device using the bonded magnet. The rare-earth permanent magnetic powders comprise a 70-99vol% hard magnetic phase and a 1-30vol% soft magnetic phase. The hard magnetic phase has a TbCu7 structure, and has a crystal grain size of 5-100nm. The soft magnetic phase is an Fe phase with a bcc structure. An average crystal grain size of the soft magnetic phase is 1-30nm, and a standard deviation of the grain size is less than 0.5σ. The rare-earth permanent magnetic powders are mainly dual-phase magnet powders with combined soft and hard magnetic phases, that is, the hard magnetic phase with the TbCu7 structure and the soft magnetic phase with an α-Fe structure. The dual-phase magnetic powders have a uniform microstructure and can ensure uniform coupling of the hard magnetic phase and the software magnetic phase, thereby improving the magnetic performance.