Invention Grant
US08187392B2 R-Fe-B type rare earth sintered magnet and process for production of the same
有权
R-Fe-B型稀土烧结磁体及其制造方法
- Patent Title: R-Fe-B type rare earth sintered magnet and process for production of the same
- Patent Title (中): R-Fe-B型稀土烧结磁体及其制造方法
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Application No.: US12666323Application Date: 2008-07-01
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Publication No.: US08187392B2Publication Date: 2012-05-29
- Inventor: Koshi Yoshimura , Hideyuki Morimoto , Tomoori Odaka
- Applicant: Koshi Yoshimura , Hideyuki Morimoto , Tomoori Odaka
- Applicant Address: JP Tokyo
- Assignee: Hitachi Metals, Ltd.
- Current Assignee: Hitachi Metals, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Keating & Bennett, LLP
- Priority: JP2007-174063 20070702
- International Application: PCT/JP2008/001727 WO 20080701
- International Announcement: WO2009/004794 WO 20090108
- Main IPC: H01F1/057
- IPC: H01F1/057
Abstract:
In an R—Fe—B based rare-earth sintered magnet according to the present invention, at a depth of 20 μm under the surface of its magnet body, crystal grains of an R2Fe14B type compound have an (RL1-xRHx)2Fe14B (where 0.2≦x≦0.75) layer with a thickness of 1 nm to 2 μm in their outer periphery. In this case, the light rare-earth element RL is at least one of Nd and Pr, and the heavy rare-earth element RH is at least one element selected from the group consisting of Dy, Ho and Tb.
Public/Granted literature
- US20100182113A1 R-Fe-B TYPE RARE EARTH SINTERED MAGNET AND PROCESS FOR PRODUCTION OF THE SAME Public/Granted day:2010-07-22
Information query
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