发明申请
- 专利标题: Rotating Machine with Sintered Magnet and Method for Producing Sintered Magnet
- 专利标题(中): 烧结磁铁旋转机及烧结磁铁生产方法
-
申请号: US13453634申请日: 2012-04-23
-
公开(公告)号: US20120205573A1公开(公告)日: 2012-08-16
- 发明人: Matahiro KOMURO , Yuichi Satsu , Yoshii Morishita , Shigeaki Funyu , Mitsuo Katayose
- 申请人: Matahiro KOMURO , Yuichi Satsu , Yoshii Morishita , Shigeaki Funyu , Mitsuo Katayose
- 申请人地址: JP Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JP Tokyo
- 优先权: JP2008-195950 20080730
- 主分类号: H01F1/01
- IPC分类号: H01F1/01
摘要:
An R—Fe—B sintered magnet has a structure including main phase crystal grains and a grain boundary area surrounding the crystal grains. The sintered magnet includes fluorine and a specified metal element selected from elements belonging to Group 2 through Group 16 of periodic table excepting the rare earth element, carbon and boron. The fluorine has a higher concentration in a region closer to a magnet surface than in the center. The specified element also has a higher concentration in the region closer to the surface. The sintered magnet includes oxyfluoride containing carbon, Dy and the metal element in a grain boundary area region at a distance of 1 μm or greater from the magnet surface, and the carbon has a higher concentration than the concentration of the metal element in a region at a distance of 1 μm to 500 μm from the magnet surface.