公开(公告)号：US09520216B2

公开(公告)日：2016-12-13

申请号：US14254220

申请日：2014-04-16

Applicant: TDK CORPORATION

Inventor： Yasushi Enokido ,  Kyung-Ku Choi ,  Ryuji Hashimoto ,  Daisuke Tanaka

IPC: H01F1/057 ,  H01F1/053

CPC classification number: H01F1/0536 ,  H01F1/0577

Abstract: An R-T-B based magnet as raw material undergoes heating treatment for a long time and main phase grains turn core-shell like. The R-T-B based magnet includes main phase grains having core and shell portions that covers the core. When the mass concentration of R1 and Y in the core portion is set as αR1 and αY respectively and the mass concentration of R1 and Y in the shell portion is set as βR1 and βY respectively, the ratio (B/A) between the mass concentration ratio of R1 to Y in the shell portion (βR1/βY=B) and the mass concentration ratio of R1 to Y in the core portion (αR1/αY=A) is 1.1 or more. Thus, the decrease of coercivity caused by Y addition is prevented, and the increase effect of temperature characteristics caused by addition of Y will lead to improve the magnetic properties under high temperature.

Abstract translation: 作为原料的R-T-B系磁体经受长时间的加热处理，主相颗粒转变为核壳。 R-T-B系磁体包括具有覆盖芯的芯部和壳部的主相晶粒。 核心部分的R1和Y的质量浓度分别设定为αR1和αY，壳部分的R1和Y的质量浓度分别设定为βR1和βY时，质量浓度 壳部（R1R1 /βY= B）中的R1与Y的比例以及芯部（R1R1 /αY= A）的R1〜Y的质量浓度比为1.1以上。 因此，防止由Y添加引起的矫顽力的降低，并且由于添加Y引起的温度特性的增加效果将导致在高温下提高磁性能。

公开(公告)号：US20150248953A1

公开(公告)日：2015-09-03

申请号：US14385838

申请日：2014-01-17

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Kyung-Ku Choi ,  Ryuji Hashimoto

IPC: H01F1/057 ,  H02K21/12 ,  H02K1/02

CPC classification number: H01F1/057 ,  H01F1/0577 ,  H02K1/02 ,  H02K21/12

Abstract: 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

Abstract translation: 具有与现有的Nd-Fe-B系永磁体和轻质量相当的磁特性的R-T-B系永久磁铁，也可以适用于永久磁铁同步旋转机的磁场系统用磁铁。 在用于形成主相的化合物的组成为（R1-x（Y1-zCez）x）2T14B（R是由选自La的一种或多种元素组成的稀土元素的情况下，可以获得磁体） ，Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er，Tm，Yb和Lu，Y是钇，Ce是铈，T是一种或多种具有Fe或Fe和Co作为必需元素的过渡金属元素 通过使Y4f /（Y4f + Y4g）相对于占据四方晶R2T14B结构的4f位点的Y的丰度比（B为硼，0.0

公开(公告)号：US09607743B2

公开(公告)日：2017-03-28

申请号：US14258645

申请日：2014-04-22

Applicant: TDK CORPORATION

Inventor： Yasushi Enokido ,  Kyung-Ku Choi ,  Kenichi Suzuki ,  Daisuke Tanaka

IPC: H01F1/053 ,  H01F1/057 ,  B22F1/00 ,  B32B15/01 ,  C22C38/00 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C33/02

CPC classification number: 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

Abstract: 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.

公开(公告)号：US11075041B2

公开(公告)日：2021-07-27

申请号：US16377418

申请日：2019-04-08

Applicant: TDK CORPORATION

Inventor： Akifumi Kamijima ,  Atsushi Iijima ,  Kyung-Ku Choi ,  Katsunori Osanai ,  Daisuke Iwanaga

IPC: H01H51/22 ,  H01H47/00 ,  H01H50/00 ,  H01H50/44 ,  H01H50/64 ,  H01H50/36 ,  H01H50/54 ,  H01H50/18

Abstract: A magnetically actuated MEMS switch 100 includes a first magnetic core portion 120, a first signal line 15, a first contact point 16, a second magnetic core portion 220, a second signal line 25, a second contact point 26, and a first coil portion 111 and a second coil portion 211 serving as a magnetic field applying portion that causes a current to flow in conductor coil to apply a magnetic field to the first magnetic core portion 120 and the second magnetic core portion 220. The first contact point 16 is displaced depending on the presence or absence of a magnetic field applied by the magnetic field applying portion. Connection and disconnection between the first contact point 16 and the second contact point 26 are switched in response to displacement of the first contact point 16.

公开(公告)号：US09947445B2

公开(公告)日：2018-04-17

申请号：US14385838

申请日：2014-01-17

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Kyung-Ku Choi ,  Ryuji Hashimoto

IPC: H01F1/057 ,  H02K1/02 ,  H02K21/12

CPC classification number: H01F1/057 ,  H01F1/0577 ,  H02K1/02 ,  H02K21/12

Abstract: 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

公开(公告)号：US09111674B2

公开(公告)日：2015-08-18

申请号：US14257206

申请日：2014-04-21

Applicant: TDK CORPORATION

Inventor： Ryuji Hashimoto ,  Kenichi Suzuki ,  Kyung-Ku Choi

IPC: H01F1/057 ,  H01F10/12

CPC classification number: H01F1/057 ,  H01F10/126

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20150132178A1

公开(公告)日：2015-05-14

申请号：US14385921

申请日：2014-02-12

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Kyung-Ku Choi ,  Ryuji Hashimoto

IPC: H01F1/057 ,  C22C38/00

CPC classification number: H01F1/057 ,  C22C38/002 ,  C22C38/005 ,  H01F1/0577

Abstract: A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet but also has a high adhesive strength and which 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(Ce1-zYz)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, T is one or more transition metal elements with Fe or Fe and Co as essential element(s), 0.0

Abstract translation: 一种R-T-B系永磁体，其不仅具有与现有的Nd-Fe-B系永久磁铁等效的磁特性，而且还具有高的粘合强度，并且可以适用于永磁同步旋转机的磁场系统的磁体。 在用于形成主相的化合物的组成为（R1-x（Ce1-zYz）x）2T14B（R是由选自La的一种或多种元素组成的稀土元素的情况下，可以获得磁体） ，Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er，Tm，Yb和Lu，T是一种或多种具有Fe或Fe和Co作为必需元素的过渡金属元素，0.0

公开(公告)号：US11551896B2

公开(公告)日：2023-01-10

申请号：US17354432

申请日：2021-06-22

Applicant: TDK CORPORATION

Inventor： Akifumi Kamijima ,  Atsushi Iijima ,  Kyung-Ku Choi ,  Katsunori Osanai ,  Daisuke Iwanaga

IPC: H01H50/00 ,  H01H47/00 ,  H01H50/44 ,  H01H50/64 ,  H01H50/36 ,  H01H50/54 ,  H01H50/18

Abstract: A magnetically actuated MEMS switch 100 includes a first magnetic core portion 120, a first signal line 15, a first contact point 16, a second magnetic core portion 220, a second signal line 25, a second contact point 26, and a first coil portion 111 and a second coil portion 211 serving as a magnetic field applying portion that causes a current to flow in conductor coil to apply a magnetic field to the first magnetic core portion 120 and the second magnetic core portion 220. The first contact point 16 is displaced depending on the presence or absence of a magnetic field applied by the magnetic field applying portion. Connection and disconnection between the first contact point 16 and the second contact point 26 are switched in response to displacement of the first contact point 16.

公开(公告)号：US09490053B2

公开(公告)日：2016-11-08

申请号：US14385921

申请日：2014-02-12

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Kyung-Ku Choi ,  Ryuji Hashimoto

IPC: H01F1/057 ,  C22C38/00

CPC classification number: H01F1/057 ,  C22C38/002 ,  C22C38/005 ,  H01F1/0577

Abstract: A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet but also has a high adhesive strength and which 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(Ce1-zYz)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, T is one or more transition metal elements with Fe or Fe and Co as essential element(s), 0.0

Abstract translation: 一种R-T-B系永磁体，其不仅具有与现有的Nd-Fe-B系永久磁铁等效的磁特性，而且还具有高的粘合强度，并且可以适用于永磁同步旋转机的磁场系统的磁体。 在用于形成主相的化合物的组成为（R1-x（Ce1-zYz）x）2T14B（R是由选自La的一种或多种元素组成的稀土元素的情况下，可以获得磁体） ，Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er，Tm，Yb和Lu，T是一种或多种具有Fe或Fe和Co作为必需元素的过渡金属元素，0.0

公开(公告)号：US08841226B2

公开(公告)日：2014-09-23

申请号：US13677763

申请日：2012-11-15

Applicant: TDK Corporation

Inventor： Raitarou Masaoka ,  Toshio Sakurai ,  Tomohiro Arashi ,  Kyung-Ku Choi ,  Kiyoshi Hatanaka

IPC: C04B35/468 ,  C04B35/20

CPC classification number: C04B35/462 ,  C03C14/00 ,  C04B35/20 ,  C04B35/468 ,  C04B35/62685 ,  C04B2235/3215 ,  C04B2235/3224 ,  C04B2235/3234 ,  C04B2235/3236 ,  C04B2235/3284 ,  C04B2235/3409 ,  C04B2235/3445 ,  C04B2235/36 ,  C04B2235/77 ,  H01G4/1227

Abstract: A dielectric ceramic composition includes a component represented by composition formula {α(xBaO.yNd2O3.zTiO2)+β(2MgO.SO2)} as a main component and zinc oxide, boron oxide, and a glass having a softening point equal to or lower than a certain temperature as minor components with respect to the main component. In the dielectric ceramic composition, x, y, and z that respectively represent molar ratios of BaO, Nd2O3, and TiO2 are in certain ranges and α and β that represent volume ratios of subcomponents (xBaO.yNd2O3.zTiO2 and 2MgO.SiO2) in the main component are in certain ranges. When the minor components are respectively represented by aZnO, bB2O3, and cglass, a, b, and c that represent mass ratios of the respective minor components to the main component are in certain ranges.

Abstract translation: 电介质陶瓷组合物包含由组成式{α（xBaO.yNd2O3.zTiO2）+＆bgr（（2MgO.SO2）}）表示的组分作为主要成分，氧化锌，氧化硼和软化点等于或等于 低于相对于主要组分的次要组分的一定温度。 在介电陶瓷组合物中，分别表示BaO，Nd2O3和TiO2的摩尔比的x，y和z在一定范围内，α和bgr; 表示主要成分中的子成分（xBaO.yNd2O3.zTiO2和2MgO.SiO2）的体积比在一定范围内。 当次要组分分别由ZnO，bB 2 O 3和C玻璃表示时，表示各个次要组分与主要组分的质量比的a，b和c在一定范围内。