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：US20150070005A1

公开(公告)日：2015-03-12

申请号：US14374786

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20140375308A1

公开(公告)日：2014-12-25

申请号：US14374640

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: A magnetic measurement device which can measure the magnetic characteristics in a microregion of a thin plate magnetic sample. After a magnetic sample is applied by a magnetic field and magnetized accordingly, by scanning the magnetic sample using a measuring part, the magnetic flux leakage in the magnetic sample can be measured. The magnetic flux leaks outside by magnetizing a first region and a second region of the magnetic sample in reciprocally opposite directions and reducing the demagnetizing field. Specifically, a magnetic field generating part with at least a pair of magnetic poles is used to perform the magnetization of multiple poles, or the magnetic field generating part applies a damped oscillation magnetic field to perform the magnetization, or a local magnetic field generating part which applies an alternating magnetic field and scans the surface of the sample at the same time is used to perform the magnetization.

Abstract translation: 一种能够测量薄板磁性样品的微区域中的磁特性的磁性测量装置。 在通过磁场施加磁性样品并相应地磁化后，通过使用测量部分扫描磁性样品，可以测量磁性样品中的磁通量泄漏。 通过使磁性样品的第一区域和第二区域沿相反的方向磁化并减小去磁场，使磁通量向外泄漏。 具体而言，使用具有至少一对磁极的磁场产生部来进行多极的磁化，或者磁场产生部施加阻尼振荡磁场来进行磁化，或者使用局部磁场产生部， 施加交变磁场并同时扫描样品的表面以用于执行磁化。

公开(公告)号：US10529474B2

公开(公告)日：2020-01-07

申请号：US15304193

申请日：2015-03-10

Applicant: TDK CORPORATION

Inventor： Shogo Kadota ,  Kenichi Suzuki ,  Yuji Umeda ,  Ryuji Hashimoto ,  Keiji Takeda

IPC: H01F1/055 ,  B22F3/16 ,  H01F1/058 ,  H01F1/059 ,  H01F1/057 ,  C22C38/00

Abstract: 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.

公开(公告)号：US09970087B2

公开(公告)日：2018-05-15

申请号：US14686200

申请日：2015-04-14

Applicant: TDK CORPORATION

Inventor： Ryuji Hashimoto ,  Yasushi Enokido ,  Hironori Wada

IPC: C22C38/00 ,  H01F1/057

CPC classification number: C22C38/002 ,  B22F2998/10 ,  C22C38/005 ,  H01F1/0577 ,  B22F9/023 ,  B22F9/04 ,  B22F2009/043 ,  B22F3/02 ,  B22F3/10

Abstract: In the present invention, a permanent magnet with excellent temperature properties and magnetic properties which will not significantly deteriorate can be stably prepared, by using a raw alloy for the R-T-B based permanent magnet in which the rare earth element(s) composed of at least one selected from the group consisting of Y, La and Ce is selected as a predetermined amount of the rare earth element R in the R-T-B based permanent magnet and a proper amount of Ca is contained.

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：US09354285B2

公开(公告)日：2016-05-31

申请号：US14374786

申请日：2012-12-13

Applicant: TDK CORPORATION

Inventor： Kenichi Suzuki ,  Tsutomu Chikamatsu ,  Akio Ogawa ,  Kyung-ku Choi ,  Ryuji Hashimoto

IPC: G01R33/12 ,  G01R33/10

CPC classification number: G01R33/12 ,  G01R33/10 ,  G01R33/1215

Abstract: 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.

Abstract translation: 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。

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：US09070500B2

公开(公告)日：2015-06-30

申请号：US14257541

申请日：2014-04-21

Applicant: TDK CORPORATION

Inventor： Ryuji Hashimoto ,  Kenichi Suzuki ,  Kyung-Kun 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 stacked structure of R1-T-B based crystallizing layer and (Y, La)-T-B based crystallizing layer can be formed by alternatively stacking R1-T-B and (Y, La)-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, La)-T-B based crystallizing layer can be obtained. Further, the lattice distortion in the total stacked structure is moderated by setting the rare earth elements in the (Y, La)-T-B based crystallizing layer as both of Y and La, and a high residual flux density can be obtained accordingly.

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，La）-T-B来形成R1-T-B系结晶层和（Y，La）-T-B系结晶层的层叠结构。 以这种方式，可以保持基于（Y，La）-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，通过将（Y，La）-T-B系结晶层中的稀土元素设定为Y和La两者，可以缓和总堆叠结构中的晶格畸变，并且可以相应地获得高剩余磁通密度。