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1. 发明授权

US09607743B2 R-T-B based sintered magnet 有权
公开(公告)号：US09607743B2
公开(公告)日：2017-03-28
申请号：US14258645
申请日：2014-04-22
申请人： TDK CORPORATION
发明人： Yasushi Enokido , Kyung-Ku Choi , Kenichi Suzuki , Daisuke Tanaka
IPC分类号： H01F1/053 , H01F1/057 , B22F1/00 , B32B15/01 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/16 , C22C33/02
CPC分类号： H01F1/0536 , B22F1/00 , B22F2998/10 , B22F2999/00 , B32B15/015 , C22C33/0278 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/16 , C22C2202/02 , H01F1/0577 , B22F2304/10 , B22F3/02 , B22F2202/05 , B22F9/08 , B22F9/023 , B22F2009/044 , B22F3/10 , B22F2003/248
摘要： The present invention provides a permanent magnet with excellent adhesion strength with plated layer and without significant decrease in magnetic properties, compared to the conventional R-T-B based magnet. By means that the R-T-B based magnet as the raw material is applied to heating treatment for a long time, the major phase grains will form core-shell like structures in the R-T-B based magnet in which R1 and Ce are included as an essential of R. When the mass concentration of R1 and Ce in the core portion is set as αR1 and αCe respectively and that of R1 and Ce in the shell portion is set as βR1 and βCe respectively, the ratio (B/A) between the mass concentration ratio of R1 to Ce in the shell portion (βR1/βCe=B) and that of R1 to Ce in the core portion (αR1/αCe=A) is 1.1 or more.

2. 发明授权

US10170225B2 Permanent magnet and rotating machine including the same 有权
公开(公告)号：US10170225B2
公开(公告)日：2019-01-01
申请号：US15135337
申请日：2016-04-21
申请人： TDK CORPORATION
发明人： Kenichi Suzuki , Shogo Kadota , Eiichiro Fukuchi
IPC分类号： H01F1/00 , H01F1/03 , H01F10/26 , H01F7/02 , H01F10/16 , C22C38/10 , H02K1/02 , H01F1/047 , H01F41/18
摘要： A permanent magnet having a periodic structure with the concentrations of Fe and T (T is one or more transition metal elements with Co or Ni as necessity) changing alternately, wherein, the concentrations change with a period of 3.3 nm or less and the concentration difference of Fe in the concentration change is 5 at % or more. The permanent magnet has a high saturation magnetization Is and coercivity HcJ and can be prepared even without rare earth element(s) R.

3. 发明授权

US10068690B2 R-T-B based permanent magnet 有权
公开(公告)号：US10068690B2
公开(公告)日：2018-09-04
申请号：US14664676
申请日：2015-03-20
申请人： TDK CORPORATION
发明人： Kenichi Suzuki , Yasushi Enokido
IPC分类号： H01F1/057 , C22C38/00 , H02K1/02
摘要： An R-T-B based permanent with the residual magnetic flux density Br2 satisfies the relationship of Br2/Br≥0.90, wherein the residual magnetic flux density Br2 is obtained after applying the external magnetic field of Hex and then applying an external magnetic field of 0.95 HcJ. Such a R-T-B based permanent magnet preferably contains main phase grains with a composition of (R11−xR2x)2T14B (R1 is rare earth element(s) composed of one or more elements selected from the group consisting of Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, R2 is element(s) containing at least one selected from the group consisting of Y, La and Ce, T is one or more transition metal elements including Fe or a combination of Fe and Co as essential elements, and 0.2≤x≤0.7) and thus can be suitably used as a magnet with a variable magnetic force for a variable magnetic flux motor.

4. 发明授权

US09396852B2 R-T-B based permanent magnet 有权
标题翻译： R-T-B型永久磁铁
公开(公告)号：US09396852B2
公开(公告)日：2016-07-19
申请号：US14261516
申请日：2014-04-25
申请人： TDK CORPORATION
发明人： Ryuji Hashimoto , Kenichi Suzuki , Kyung-ku Choi
IPC分类号： H01F1/057 , H01F10/12
CPC分类号： H01F1/057 , H01F10/126
摘要： The present invention provides such a permanent magnet that its magnetic properties will not significantly decrease and it can be prepared at a lower temperature, compared to conventional R-T-B based permanent magnets. In the R-T-B based structure, a stacked structure of R1-T-B based crystal layer and Ce-T-B based crystal layer can be formed by alternatively stacking the R1-T-B based crystal layer and the Ce-T-B based crystal layer. In this way, a high magnetic anisotropy field of the R1-T-B based crystal layer can be maintained while the crystallization temperature can be lowered by the Ce-T-B based crystal layer.
摘要翻译：本发明提供这样的永磁体，其磁性能不会显着降低，并且与常规的R-T-B基永磁体相比可以在较低的温度下制备。在基于R-T-B的结构中，可以通过交替堆叠R1-T-B基晶体层和Ce-T-B基晶体层来形成R1-T-B基晶体层和Ce-T-B基晶体层的堆叠结构。以这种方式，可以通过Ce-T-B类结晶层降低结晶温度，从而保持R1-T-B系晶体层的高磁各向异性场。

5. 发明授权

US09082537B2 R-T-B based permanent magnet 有权
标题翻译： R-T-B型永久磁铁
公开(公告)号：US09082537B2
公开(公告)日：2015-07-14
申请号：US14262156
申请日：2014-04-25
申请人： TDK CORPORATION
发明人： Ryuji Hashimoto , Kenichi Suzuki , Kyung-ku Choi , Kenichi Nishikawa
IPC分类号： H01F1/057 , H01F10/12
CPC分类号： H01F1/057 , H01F10/126
摘要： The present invention provides a permanent magnet which is excellent in the temperature properties and the magnetic properties of which will not be significantly decreased, compared to the conventional R-T-B based permanent magnet. In the R-T-B based structure, a stacked structure of R1-T-B based crystal layer and Y-T-B based crystal layer can be formed by alternatively stacking R1-T-B and Y-T-B. In this way, a high magnetic anisotropy field of the R1-T-B based crystal layer can be maintained while the temperature coefficient of the Y-T-B based crystal layer can be improved.
摘要翻译：本发明提供一种与常规的R-T-B系永磁体相比，其温度特性优异，磁特性不会显着降低的永磁体。在基于R-T-B的结构中，可以通过交替地堆叠R1-T-B和Y-T-B来形成R1-T-B基晶体层和Y-T-B基晶体层的堆叠结构。以这种方式，可以保持R1-T-B基晶体层的高磁各向异性场，同时可以提高Y-T-B系晶体层的温度系数。

6. 发明授权

US10529474B2 Rare-earth permanent magnet 有权
公开(公告)号：US10529474B2
公开(公告)日：2020-01-07
申请号：US15304193
申请日：2015-03-10
申请人： TDK CORPORATION
发明人： Shogo Kadota , Kenichi Suzuki , Yuji Umeda , Ryuji Hashimoto , Keiji Takeda
IPC分类号： H01F1/055 , B22F3/16 , H01F1/058 , H01F1/059 , H01F1/057 , C22C38/00
摘要： To provide a permanent magnet which uses Ce of an abundant resource and has a great magnetic anisotropy in rare earth permanent magnets. To obtain a permanent magnet having a high magnetic anisotropy due to the trivalent Ce state by setting the abundance ratio C3/(C3+C4) in the main phase grains to be 0.1≤C3/(C3+C4)≤0.5 where C3 denotes the number of trivalent Ce atoms and C4 denotes the number of tetravalent Ce atoms.

7. 发明授权

US10157701B2 R-T-B based permanent magnet 有权
公开(公告)号：US10157701B2
公开(公告)日：2018-12-18
申请号：US14666831
申请日：2015-03-24
申请人： TDK CORPORATION
发明人： Yasushi Enokido , Kenichi Suzuki
IPC分类号： H01F1/01 , H02K1/02 , H01F1/057
摘要： The present invention provides a R-T-B based permanent magnet, comprising a demagnetization curve having a slope ΔJ/Δ(H/HcJ) of less than 400 kG at a region where the value of magnetic field is Hk or less, wherein it is preferable that R in the composition of R-T-B is represented by (R11-xR2x), and T represents one or more transition metal elements containing Fe or a combination of Fe and Co as necessary, where: R1 represents the rare earth element(s) composed of one or more elements selected from the group consisting of Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and R2 contains at least one element selected from the group consisting of Y, Ce and La, and 0.2≤x≤0.7.

8. 发明授权

US09947445B2 R-T-B based permanent magnet 有权
公开(公告)号：US09947445B2
公开(公告)日：2018-04-17
申请号：US14385838
申请日：2014-01-17
申请人： TDK CORPORATION
发明人： Kenichi Suzuki , Kyung-Ku Choi , Ryuji Hashimoto
IPC分类号： H01F1/057 , H02K1/02 , H02K21/12
CPC分类号： H01F1/057 , H01F1/0577 , H02K1/02 , H02K21/12
摘要： A R-T-B based permanent magnet which has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet and light mass but also can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1−x(Y1−zCez)x)2T14B (R is rare earth element(s) consisting of one or more elements selected from La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Y is yttrium, Ce is cerium, T is one or more transition metal elements with Fe or Fe and Co as essential element(s), B is boron, 0.0

9. 发明授权

US09354285B2 Magnetic measurement device 有权
标题翻译：磁性测量装置
公开(公告)号：US09354285B2
公开(公告)日：2016-05-31
申请号：US14374786
申请日：2012-12-13
申请人： TDK CORPORATION
发明人： Kenichi Suzuki , Tsutomu Chikamatsu , Akio Ogawa , Kyung-ku Choi , Ryuji Hashimoto
IPC分类号： G01R33/12 , G01R33/10
CPC分类号： G01R33/12 , G01R33/10 , G01R33/1215
摘要： A magnetic measurement device which measures coercivity and coercivity distribution in a microregion of a thin plate magnetic sample with high coercivity. A magnetic sample is applied with a magnetic field in a first direction and magnetized, a second magnetic field is applied in a direction opposite to the first, a measuring part scans the sample, measuring magnetic flux leakage due to remnant magnetization in the sample. The intensity of the second magnetic field is gradually increased while the measuring part repeats the measurement to obtain the second magnetic field wherein the magnitude of the leakage from the sample reaches the maximum level, and when a magnetic field equivalent to the coercivity is applied to the sample and about half of the magnetization is reversed, the sample's coercivity is obtained based on the determination that the demagnetizing field Hd reaches the minimum level and the leakage reaches the maximum level.
摘要翻译：一种磁测量装置，其测量具有高矫顽力的薄板磁性样品的微区域中的矫顽力和矫顽力分布。磁性样品沿第一方向施加磁场并被磁化，在与第一方向相反的方向上施加第二磁场，测量部分扫描样品，测量样品中残留磁化的磁通量泄漏。第二磁场的强度逐渐增加，而测量部分重复测量以获得第二磁场，其中来自样品的泄漏的大小达到最大电平，并且当将等于矫顽力的磁场施加到样品中约一半的磁化反转，基于去磁场Hd达到最小值并且漏电达到最大值的确定获得样品的矫顽力。

10. 发明授权

US09111674B2 R-T-B based permanent magnet 有权
标题翻译： R-T-B型永久磁铁
公开(公告)号：US09111674B2
公开(公告)日：2015-08-18
申请号：US14257206
申请日：2014-04-21
申请人： TDK CORPORATION
发明人： Ryuji Hashimoto , Kenichi Suzuki , Kyung-Ku Choi
IPC分类号： H01F1/057 , H01F10/12
CPC分类号： H01F1/057 , H01F10/126
摘要： The present invention provides a permanent magnet whose magnetic properties will not be significantly decreased and which is excellent in the temperature properties compared to the existing R-T-B based permanent magnet. In the R-T-B based structure, a stack structure of R1-T-B based crystallizing layer and (Y,Ce)-T-B based crystallizing layer can be formed by alternatively stacking R1-T-B and (Y,Ce)-T-B. In this way, a high magnetic anisotropy field of the R1-T-B based crystallizing layer can be maintained while an improved temperature coefficient of the (Y,Ce)-T-B based crystallizing layer can be obtained. Further, a high coercivity can be obtained by adding the Ce-T-B based crystallizing layer with a low lattice distortion to the Y-T-B based crystallizing layer.
摘要翻译：本发明提供一种与现有的R-T-B系永久磁铁相比，其磁特性不会显着降低且温度特性优异的永磁体。在基于R-T-B的结构中，可以通过交替堆叠R1-T-B和（Y，Ce）-T-B来形成R1-T-B系结晶层和（Y，Ce）-T-B系结晶层的堆叠结构。以这种方式，可以保持基于（Y，Ce）-T-B的结晶层的温度系数提高的R1-T-B系结晶层的高磁各向异性场。此外，通过向基于Y-T-B的结晶层添加具有低晶格畸变的Ce-T-B系结晶层，可以获得高的矫顽力。

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