Invention Grant
- Patent Title: Sintered magnet
- Patent Title (中): 烧结磁体
-
Application No.: US13572812Application Date: 2012-08-13
-
Publication No.: US09129731B2Publication Date: 2015-09-08
- Inventor: Matahiro Komuro , Yuichi Satsu , Isao Kitagawa , Akira Sugawara
- Applicant: Matahiro Komuro , Yuichi Satsu , Isao Kitagawa , Akira Sugawara
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Crowell & Moring LLP
- Priority: JP2011-205491 20110921
- Main IPC: H01F7/02
- IPC: H01F7/02 ; H01F1/01 ; H01F1/057

Abstract:
Disclosed is a sintered magnet which is a rare-earth magnet using a less amount of a rare-earth element but having a higher maximum energy product and a higher coercivity. The sintered magnet includes a NdFeB crystal; and an FeCo crystal adjacent to the NdFeB crystal through the medium of a grain boundary. The FeCo crystal includes a core and a periphery and has a cobalt concentration decreasing from the core to the periphery. The FeCo crystal has a difference in cobalt concentration of 2 atomic percent or more between the core and the periphery. In the NdFeB crystal, cobalt and a heavy rare-earth element are unevenly distributed and enriched in the vicinity of the grain boundary.
Public/Granted literature
- US20130069746A1 Sintered Magnet Public/Granted day:2013-03-21
Information query