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公开(公告)号：US08177921B2
公开(公告)日：2012-05-15
申请号：US12670718
申请日：2008-07-25
IPC分类号： H01F1/057
CPC分类号： C21D6/00 , B22F2003/248 , B22F2998/10 , C22C33/0278 , C22C38/005 , C22C2202/02 , H01F1/0577 , H01F41/0293 , B22F9/023 , B22F9/04 , B22F3/02 , B22F3/10 , B22F3/24
摘要： An R—Fe—B based rare-earth sintered magnet according to the present invention includes, as a main phase, crystal grains of an R2Fe14B type compound that includes Nd, which is a light rare-earth element, as a major rare-earth element R. The magnet includes a heavy rare-earth element RH (which is at least one of Dy and Tb) that has been introduced through the surface of the sintered magnet by diffusion. The magnet has a region in which the concentration of the heavy rare-earth element RH in a grain boundary R-rich phase is lower than at the surface of the crystal grains of the R2Fe14B type compound but higher than at the core of the crystal grains of the R2Fe14B type compound.
摘要翻译： 本发明的R-Fe-B系稀土类烧结磁体作为主相，含有作为主稀土元素的作为轻稀土元素的Nd的R2Fe14B型化合物的晶粒 元素R.磁体包括通过扩散通过烧结磁体的表面引入的重稀土元素RH（其是Dy和Tb中的至少一种）。 磁体具有这样的区域，其中富R晶相中的重稀土元素RH的浓度比R2Fe14B型化合物的晶粒表面低，但高于晶粒的核心 的R2Fe14B型化合物。
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公开(公告)号：US20110012699A1
公开(公告)日：2011-01-20
申请号：US12670718
申请日：2008-07-25
IPC分类号： H01F7/02
CPC分类号： C21D6/00 , B22F2003/248 , B22F2998/10 , C22C33/0278 , C22C38/005 , C22C2202/02 , H01F1/0577 , H01F41/0293 , B22F9/023 , B22F9/04 , B22F3/02 , B22F3/10 , B22F3/24
摘要： An R—Fe—B based rare-earth sintered magnet according to the present invention includes, as a main phase, crystal grains of an R2Fe14B type compound that includes Nd, which is a light rare-earth element, as a major rare-earth element R. The magnet includes a heavy rare-earth element RH (which is at least one of Dy and Tb) that has been introduced through the surface of the sintered magnet by diffusion. The magnet has a region in which the concentration of the heavy rare-earth element RH in a grain boundary R-rich phase is lower than at the surface of the crystal grains of the R2Fe14B type compound but higher than at the core of the crystal grains of the R2Fe14B type compound.
摘要翻译： 本发明的R-Fe-B系稀土类烧结磁体作为主相，含有作为主稀土元素的作为轻稀土元素的Nd的R2Fe14B型化合物的晶粒 元素R.磁体包括通过扩散通过烧结磁体的表面引入的重稀土元素RH（其是Dy和Tb中的至少一种）。 磁体具有这样的区域，其中富R晶相中的重稀土元素RH的浓度比R2Fe14B型化合物的晶粒表面低，但高于晶粒的核心 的R2Fe14B型化合物。
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公开(公告)号：US20110205006A1
公开(公告)日：2011-08-25
申请号：US12671915
申请日：2008-09-02
CPC分类号： H01F1/0577 , B22F2999/00 , C22C33/0257 , C22C38/005 , C22C2202/02 , H01F41/0293 , B22F2207/01
摘要： An R—Fe—B based anisotropic sintered magnet according to the present invention has, as a main phase, an R2Fe14B type compound that includes a light rare-earth element RL (which is at least one of Nd and Pr) as a major rare-earth element R, and also has a heavy rare-earth element RH (which is at least one element selected from the group consisting of Dy and Tb). In the crystal lattice of the main phase, the c-axis is oriented in a predetermined direction. The magnet includes a portion in which at least two peaks of diffraction are observed within a 2θ range of 60.5 degrees to 61.5 degrees when an X-ray diffraction measurement is carried out using a CuK α ray on a plane that is located at a depth of 500 μm or less under a pole face of the magnet and that is parallel to the pole face.
摘要翻译： 本发明的R-Fe-B系各向异性烧结磁体作为主相，具有稀土元素RL（Nd和Pr中的至少一种）作为主要稀有元素的R2Fe14B型化合物 - 地基元素R，并且还具有重稀土元素RH（其是选自Dy和Tb中的至少一种元素）。 在主相的晶格中，c轴沿预定方向取向。 磁体包括在2θ范围内观察至少两个衍射峰的部分; 在使用CuKα射线进行X射线衍射测定的情况下，在位于磁铁的极面的500μm以下的平面的平面上并且平行于极的X射线衍射测定的范围为60.5〜61.5度 面对。
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公开(公告)号：US08177922B2
公开(公告)日：2012-05-15
申请号：US12671915
申请日：2008-09-02
IPC分类号： H01F1/057
CPC分类号： H01F1/0577 , B22F2999/00 , C22C33/0257 , C22C38/005 , C22C2202/02 , H01F41/0293 , B22F2207/01
摘要： An R—Fe—B based anisotropic sintered magnet according to the present invention has, as a main phase, an R2Fe14B type compound that includes a light rare-earth element RL (which is at least one of Nd and Pr) as a major rare-earth element R, and also has a heavy rare-earth element RH (which is at least one element selected from the group consisting of Dy and Tb). In the crystal lattice of the main phase, the c-axis is oriented in a predetermined direction. The magnet includes a portion in which at least two peaks of diffraction are observed within a 2θ range of 60.5 degrees to 61.5 degrees when an X-ray diffraction measurement is carried out using a CuK α ray on a plane that is located at a depth of 500 μm or less under a pole face of the magnet and that is parallel to the pole face.
摘要翻译： 本发明的R-Fe-B系各向异性烧结磁体作为主相，具有稀土元素RL（Nd和Pr中的至少一种）作为主要稀有元素的R2Fe14B型化合物 - 地基元素R，并且还具有重稀土元素RH（其是选自Dy和Tb中的至少一种元素）。 在主相的晶格中，c轴沿预定方向取向。 磁体包括在2θ范围内观察到至少两个衍射峰的部分; 在使用CuKα射线进行X射线衍射测定的情况下，在位于磁铁的极面的500μm以下的平面的平面上并且平行于极的X射线衍射测定的范围为60.5〜61.5度 面对。
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公开(公告)号：US06752879B2
公开(公告)日：2004-06-22
申请号：US10446835
申请日：2003-05-29
申请人： Shigeru Takaki , Ken Makita
发明人： Shigeru Takaki , Ken Makita
IPC分类号： H01F1057
CPC分类号： H01F1/0577
摘要： A compact is produced from an alloy powder for R—Fe—B type rare earth magnets including particles having a size in a range of about 2.0 &mgr;m to about 5.0 &mgr;m as measured by a light scattering method using a Fraunhofer forward scattering in a proportion of approximately 45 vol. % or more and particles having a size larger than about 10 &mgr;m in a proportion of less than about 1 vol. %. The compact is then sintered to obtain a R—Fe—B type rare earth magnet having an average crystal grain size in a range of about 5 &mgr;m to about 7.5 &mgr;m, and an oxygen concentration in a range of about 2.2 at. % to about 3.0 at. %.
摘要翻译： 由用于R-Fe-B型稀土磁体的合金粉末制造压块，其包括尺寸在约2.0μm至约5.0μm范围内的颗粒，其通过使用Fraunhofer向前散射的光散射法测量，其比例为 约45体积 ％以上的粒子，其粒径大于约10um的粒子，其比例小于约1体积％。 ％。 然后将该烧结体烧结，得到平均晶粒尺寸在约5μm至约7.5μm范围内且氧浓度在约2.2at。范围内的R-Fe-B型稀土磁体。 ％至约3.0英寸 ％。
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公开(公告)号：US06648984B2
公开(公告)日：2003-11-18
申请号：US09961536
申请日：2001-09-24
申请人： Shigeru Takaki , Ken Makita
发明人： Shigeru Takaki , Ken Makita
IPC分类号： H01F1057
CPC分类号： H01F1/0577
摘要： A compact is produced from an alloy powder for R—Fe—B type rare earth magnets including particles having a size in a range of about 2.0 &mgr;m to about 5.0 &mgr;m as measured by a light scattering method using a Fraunhofer forward scattering in a proportion of approximately 45 vol. % or more and particles having a size larger than about 10 &mgr;m in a proportion of less than about 1 vol. %. The compact is then sintered to obtain a R—Fe—B type rare earth magnet having an average crystal grain size in a range of about 5 &mgr;m to about 7.5 &mgr;m, and an oxygen concentration in a range of about 2.2 at. % to about 3.0 at. %.
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