公开(公告)号：US09850559B2

公开(公告)日：2017-12-26

申请号：US14681482

申请日：2015-04-08

Applicant: TDK CORPORATION

Inventor： Daisuke Tanaka ,  Yasushi Enokido

IPC: H02K1/02 ,  C22C38/00 ,  H02K1/27 ,  H01F1/057 ,  C22C33/02

CPC classification number: C22C38/005 ,  C22C33/0278 ,  C22C38/002 ,  C22C2202/02 ,  H01F1/0577 ,  H02K1/02 ,  H02K1/2766

Abstract: The present invention provides a permanent magnet suitable as a variable flux magnet for a variable magnetic flux motor. A permanent magnet comprising R (R is composed of 75 at % or more of Nd and 25 at % or less of at least one element selected from the group consisting of Y, Ce, La, Pr, Sm, Eu, Gd, Er, Tm, Yb and Lu), Fe and B as the main component, wherein, said permanent magnet is composed of a main phase of a crystal structure represented by R2Fe14B, a ratio of the element R to all constituent element satisfies 11.8 at %≦R≦12.2 at %, a cross-sectional area ratio Are of the sub-phase with a higher concentration of R than that of the main phase to the whole magnet structure satisfies 0%

公开(公告)号：US09767945B2

公开(公告)日：2017-09-19

申请号：US14678284

申请日：2015-04-03

Applicant: TDK CORPORATION

Inventor： Daisuke Tanaka ,  Yasushi Enokido

IPC: H02K15/12 ,  H01F1/057

CPC classification number: H01F1/0578

Abstract: A magnet powder having a composition composed of R (R consists of R1 and R2, R1 represents at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb and Lu, R2 represents at least one rare earth element selected from the group consisting of Ho and Gd). T (T represents at least one transition metal element containing Fe or the combination of Fe and Co as essential element(s)) and B, wherein, the atomic ratio of R2/(R1×R2) is 0.05 to 0.1, the ratio of R/T is 0.25 to 0.35, and the magnet powder has an average primary particle size of 45 to 100 nm. The present invention also provides a bond magnet using the magnet powder.

公开(公告)号：US09774220B2

公开(公告)日：2017-09-26

申请号：US14678288

申请日：2015-04-03

Applicant: TDK CORPORATION

Inventor： Daisuke Tanaka ,  Yasushi Enokido

IPC: H02K21/00 ,  H02K1/02 ,  C22C28/00 ,  C22C30/02 ,  H01F1/057 ,  C22C33/02 ,  C22C38/00

CPC classification number: H02K1/02 ,  C22C28/00 ,  C22C30/02 ,  C22C33/0278 ,  C22C38/002 ,  C22C38/005 ,  C22C2202/02 ,  H01F1/0577

Abstract: The present invention provides an R-T-B based permanent magnet, comprising: a main phase which is composed of the structure of R2T14B (R is at least one element selected from Y, La, Ce, Pr, Nd, Sm, Eu and Gd, and T is one or more transition metal elements having Fe or a combination of Fe and Co as necessary); and a grain boundary phase which is composed of CexM1-x (M is at least one element selected from Mg, Al, Si, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Y, Zr, Nb, Mo, Ag, In, Sn, La, Pr, Nd, Sm, Eu, Gd, Hf, Ta, W and Bi, and x is within the range of 0.20≦x≦0.55), and the cross-sectional ratio Atre of the grain boundary phase to the whole magnet structure is within the range of 0.03

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：US20150027538A1

公开(公告)日：2015-01-29

申请号：US14381321

申请日：2013-02-28

Applicant: TDK CORPORATION

Inventor： Yasuhiro Aida ,  Daisuke Tanaka ,  Masato Kurihara

IPC: H01L31/032 ,  H01L31/18 ,  H01L31/06

CPC classification number: H01L31/0322 ,  H01L31/0368 ,  H01L31/06 ,  H01L31/0749 ,  H01L31/18 ,  Y02E10/541 ,  Y02P70/521

Abstract: A solar battery capable of increasing conversion efficiency compared with a conventional solar battery using a chalcopyrite p-type light absorption layer. A light absorption layer of the solar battery is a p-type semiconductor layer including Cu, Ga, and an element selected from group VIb elements. A photoluminescence spectrum or a cathode luminescence spectrum obtained from the light absorption layer includes an emission peak with the half-value width of not less than 1 meV and not more than 15 meV. The ratio of the particles with the grain size of not less than 2 μm and not more than 8 μm in a surface of the light absorption layer to the surface area of the entire film is not less than 90%.

Abstract translation: 与使用黄铜矿p型光吸收层的常规太阳能电池相比，能够提高转换效率的太阳能电池。 太阳能电池的光吸收层是包含Cu，Ga的p型半导体层和选自VIb族元素的元素。 从光吸收层获得的光致发光光谱或阴极发光光谱包括半值宽度不小于1meV且不大于15meV的发射峰。 光吸收层的表面的粒径为2μm以上且8μm以下的粒子与整个膜的表面积的比例为90％以上。

公开(公告)号：US09627113B2

公开(公告)日：2017-04-18

申请号：US14258524

申请日：2014-04-22

Applicant: TDK CORPORATION

Inventor： Yasushi Enokido ,  Daisuke Tanaka

IPC: H01F1/053 ,  H01F1/057

CPC classification number: H01F1/0536 ,  H01F1/0577

Abstract: The present invention provides a permanent magnet with a coercivity that will not be significantly decreased and a light weight compared to conventional R-T-B based permanent magnets. A core-shell structure is formed for the major phase grain by adding Cu to the R-T-B based magnet which is the raw material. When the mass concentration of Y in the core portion is set as EY, the mass concentration of Y in the shell portion is set as LY and the mass concentration of Y in the R2—Fe14—B crystal grain calculated from the ratio R1:Y in the total composition is set as SY, the ratio α of EY to SY (EY/SY) is 1.1 or more. Thus, the magnetic insulation among the crystal grains becomes better which prevents the coercivity from decreasing due to the addition of Y. Further, the addition of Y makes the magnet lighter in weight.

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。