发明授权
- 专利标题: Ferrite magnetic material and ferrite sintered magnet
- 专利标题(中): 铁氧体磁性材料和铁氧体烧结磁体
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申请号: US10581212申请日: 2004-12-08
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公开(公告)号: US07481947B2公开(公告)日: 2009-01-27
- 发明人: Yoshihiko Minachi , Junichi Nagaoka , Shunsuke Kurasawa , Noboru Ito , Taku Murase , Takeshi Masuda , Kenya Takagawa , Hidenobu Umeda
- 申请人: Yoshihiko Minachi , Junichi Nagaoka , Shunsuke Kurasawa , Noboru Ito , Taku Murase , Takeshi Masuda , Kenya Takagawa , Hidenobu Umeda
- 申请人地址: JP Tokyo
- 专利权人: TDK Corporation
- 当前专利权人: TDK Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Hogan & Hartson LLP
- 优先权: JP2003-411030 20031209; JP2003-411031 20031209; JP2004-021192 20040129; JP2004-021193 20040129; JP2004-130747 20040427
- 国际申请: PCT/JP2004/018286 WO 20041208
- 国际公布: WO2005/056493 WO 20050623
- 主分类号: C04B35/26
- IPC分类号: C04B35/26 ; H01F1/10
摘要:
A ferrite magnetic material comprising a main phase of W-type is provided which has magnetic properties improved through the optimization of additives. The ferrite magnetic material comprises a main constituent having a compound represented by composition formula AFe2+aFe3+bO27 (wherein A comprises at least one element selected from Sr, Ba and Pb; 1.5≦a≦2.1; and 12.9≦b≦16.3), a first additive containing a Ca constituent (0.3 to 3.0 wt % in terms of CaCO3) and/or a Si constituent (0.2 to 1.4 wt % in terms of SiO2), and a second additive containing at least one of an Al constituent (0.01 to 1.5 wt % in terms of Al2O3), a W constituent (0.01 to 0.6 wt % in terms of WO3), a Ce constituent (0.001 to 0.6 wt % in terms of CeO2), a Mo constituent (0.001 to 0.16 wt % in terms of MoO3), and a Ga constituent (0.001 to 15 wt % in terms of Ga2O3).
公开/授权文献
- US20070099033A1 Ferrite magnetic material and ferrite sintered magnet 公开/授权日:2007-05-03
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