公开(公告)号：US20150294773A1

公开(公告)日：2015-10-15

申请号：US14678284

申请日：2015-04-03

Applicant: TDK CORPORATION

Inventor： Daisuke TANAKA ,  Yasushi ENOKIDO

IPC: H01F1/057 ,  H02K1/02 ,  H01F1/08

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.

Abstract translation: 具有由R（R由R 1和R 2组成）的组成的磁铁粉末，R1表示选自Y，La，Ce，Pr，Nd，Sm，Eu，Tb，Dy，Er中的至少一种稀土元素 ，Tm，Yb和Lu，R2表示选自Ho和Gd中的至少一种稀土元素）。 T（T表示至少一种含有Fe或Fe和Co作为必需元素的组合的过渡金属元素）和B，其中R2 /（R1×R2）的原子比为0.05〜0.1， R / T为0.25〜0.35，磁铁粉末的平均一次粒径为45〜100nm。 本发明还提供一种使用该磁体粉末的粘结磁体。

公开(公告)号：US20150294770A1

公开(公告)日：2015-10-15

申请号：US14678288

申请日：2015-04-03

Applicant: TDK CORPORATION

Inventor： Daisuke TANAKA ,  Yasushi ENOKIDO

IPC: H01F1/055 ,  C22C30/02 ,  H02K1/02 ,  C22C28/00

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

Abstract translation: 本发明提供了一种基于RTB的永磁体，其特征在于，包括：主相，其由R2T14B（R为选自Y，La，Ce，Pr，Nd，Sm，Eu和Gd中的至少一种元素，T， 是一种或多种具有Fe的Fe或Fe和Co的组合的过渡金属元素; 和由CexM1-x组成的晶界相（M为选自Mg，Al，Si，Ti，Cr，Mn，Fe，Co，Ni，Cu，Zn，Ga，Y，Zr，Nb中的至少一种元素） ，Mo，Ag，In，Sn，La，Pr，Nd，Sm，Eu，Gd，Hf，Ta，W和Bi中的至少一个，x在0.20≤n1E的范围内; x＆nlE; 0.55） 对于整个磁体结构的晶界相，在0.03

公开(公告)号：US20140311287A1

公开(公告)日：2014-10-23

申请号：US14254220

申请日：2014-04-16

Applicant: TDK CORPORATION

Inventor： Yasushi ENOKIDO ,  Kyung-Ku CHOI ,  Ryuji HASHIMOTO ,  Daisuke TANAKA

IPC: H01F1/053

CPC classification number: H01F1/0536 ,  H01F1/0577

Abstract: The present invention provides a permanent magnet with excellent temperature characteristics and without magnetic properties significantly decreased compared to the existing 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 main phase grains will turn into core-shell like, and said R-T-B based magnet comprises main phase grains having core portion and shell portion that covers the core. When the mass concentration of RI 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: 本发明提供一种与现有的R-T-B基磁体相比，具有优异的温度特性和不具有磁性能的永磁体。 通过将作为原料的RTB型磁体长时间地应用于加热处理，主相晶粒将变成芯 - 壳状，并且所述RTB基磁体包括具有芯部的主相晶粒和覆盖的芯部分 核心。 核心部分的RI和Y的质量浓度分别设定为αR1和αY，并且壳部分中的R1和Y的质量浓度分别设置为＆Bgr; R1和＆bgr; Y，比率（B / A） 在壳部分中的R1与Y的质量浓度比（＆Bgr; R1 /＆bgr; Y = B）和芯部中的R1与Y的质量浓度比（αR1/αY= A）之间为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：US20150294771A1

公开(公告)日：2015-10-15

申请号：US14681482

申请日：2015-04-08

Applicant: TDK CORPORATION

Inventor： Daisuke TANAKA ,  Yasushi ENOKIDO

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

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%

Abstract translation: 本发明提供一种适用于可变磁通电动机的可变磁通磁体的永磁体。 包含R（R由Nd的75at％或更多的Nd和25at％或更少的选自Y，Ce，La，Pr，Sm，Eu，Gd，Er， Tm，Yb和Lu），Fe和B作为主要成分，其中所述永磁体由R2Fe14B表示的晶体结构的主相组成，元素R与全部构成元素的比例满足11.8at％＆nlE; R＆nlE; 12.2at％，相对于整个磁体结构，具有比主相的R浓度高的子相的横截面积比Are满足0％

公开(公告)号：US20140311291A1

公开(公告)日：2014-10-23

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

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.

Abstract translation: 与常规的R-T-B系磁铁相比，本发明提供了一种与镀层具有优异粘合强度并且磁性能没有显着降低的永磁体。 通过将作为原料的RTB型磁体长时间地应用于加热处理，主相晶粒将在RTB基磁体中形成核壳状结构，其中包含R1和Ce作为R的必要条件。 核心部分的R1和Ce的质量浓度分别设定为αR1和αCe，壳部分中的R1和Ce的质量浓度分别设定为R1和＆bgr; Ce时，比例（B / A） 外壳部分（＆bgr; R1 / bgr; Ce = B）中的R1〜Ce的质量浓度比以及芯部（αR1/αCe= A）的R1〜Ce的质量浓度比为1.1以上。

公开(公告)号：US20140311290A1

公开(公告)日：2014-10-23

申请号：US14258524

申请日：2014-04-22

Applicant: TDK CORPORATION

Inventor： Yasushi ENOKIDO ,  Daisuke TANAKA

IPC: H01F1/053

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 a 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.

Abstract translation: 本发明提供一种与常规R-T-B基永磁体相比，矫顽力不会显着降低并且重量轻的永磁体。 通过向作为原料的R-T-B系磁铁添加Cu，为主相晶粒形成核 - 壳结构。 当核心部分中的Y的质量浓度设定为EY时，壳部分中的Y的质量浓度被设定为LY，并且R2-Fe14-B晶粒中的Y的质量浓度由R1:Y 在总组合物中设定为SY，EY与SY（EY / SY）的比a为1.1以上。 因此，晶粒之间的磁绝缘变得更好，从而防止矫顽力由于添加Y而降低。另外，Y的添加使得磁体的重量更轻。