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公开(公告)号：US20180287441A1
公开(公告)日：2018-10-04
申请号：US15936790
申请日：2018-03-27
Applicant: TDK CORPORATION
Inventor： Hidetake KITAOKA , Makoto IWASAKI , Tetsuya HIDAKA , Eiji KATO , Takuma HAYAKAWA
Abstract: Provided is a motor including a permanent magnet, in which the permanent magnet includes a high temperature side permanent magnet part exposed to a high temperature inside the motor, and a low temperature side permanent magnet part exposed to a temperature lower than the high temperature inside the motor, and a coercive force of the high temperature side permanent magnet part is higher than the coercive force of the low temperature side permanent magnet part.
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公开(公告)号：US20160163434A1
公开(公告)日：2016-06-09
申请号：US14906732
申请日：2014-08-08
Applicant: TDK Corporation
Inventor： Isao KANADA , Masashi MIWA , Haruna NAKAJIMA , Eiji KATO
IPC: H01F1/059 , C22C38/16 , C22C38/10 , H02K1/27 , C22C38/00 , C22C38/02 , H02K1/02 , B22F1/00 , C22C38/06
CPC classification number: H01F1/059 , B22F1/0003 , B22F2301/35 , B22F2998/10 , B22F2999/00 , C22C38/00 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/06 , C22C38/10 , C22C38/16 , H01F1/0577 , H01F41/0293 , H02K1/02 , H02K1/2706 , B22F3/087 , B22F2202/05 , B22F3/1007 , B22F2201/20 , B22F9/023 , B22F9/04 , B22F3/1028
Abstract: The present invention provides an R-T-B based sintered magnet having excellent corrosion resistance together with good magnetic properties. The R-T-B based sintered magnet contains R2T14B grains, wherein, an R—Cu-M-C concentrated part is existed in a grain boundary formed between or among two or more adjacent R2T14B grains, and the concentrations of R (R is at least one from Sc, Y and the lanthanoide element), Cu, M (M is at least one from Ga, Si, Sn, Ge and Bi) and C in the R—Cu-M-C concentrated part are higher than those in the R2T14B grains respectively.
Abstract translation: 本发明提供了具有优异的耐腐蚀性和良好磁性的R-T-B系烧结磁体。 RTB型烧结磁体含有R2T14B晶粒，其中R-Cu-MC浓缩部分存在于两个或更多相邻的R2T14B晶粒之间形成的晶界中，R（R为Sc， Y和镧系元素），Cu，M（M为Ga，Si，Sn，Ge和Bi中的至少一种），R-Cu-MC浓缩部分的C分别高于R2T14B晶粒。
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公开(公告)号：US20140290803A1
公开(公告)日：2014-10-02
申请号：US14228808
申请日：2014-03-28
Applicant: TDK CORPORATION
Inventor： Eiji KATO , Yoshinori FUJIKAWA , Taeko TSUBOKURA , Chikara ISHIZAKA , Katsuo SATO
CPC classification number: H01F1/0577 , H01F41/0273
Abstract: The present invention provides a rare earth based magnet including R2T14B main-phase crystal grains, and two-grain boundary phases between adjacent two R2T14B main-phase crystal grains, the two-grain boundary phases are controlled such that the thickness thereof is 5 nm or more and 500 nm or less, and it is composed of a phase with a magnetism different from that of a ferromagnet.
Abstract translation: 本发明提供一种包含R2T14B主相晶粒和相邻的两个R2T14B主相晶粒之间的双晶界相的稀土类磁体，控制两晶界相的厚度为5nm， 多于500nm或更小，并且由具有与铁磁体不同的磁性的相组成。
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公开(公告)号：US20180277288A1
公开(公告)日：2018-09-27
申请号：US15928378
申请日：2018-03-22
Applicant: TDK CORPORATION
Inventor： Makoto IWASAKI , Tetsuya HIDAKA , Eiji KATO , Takuma HAYAKAWA , Hidetake KITAOKA
Abstract: Provided is an R-T-B based rare earth magnet. R is one or more rare earth elements, T is one or more transition metal elements essentially including Fe or Fe and Co, and B is boron. B content with respect to a total R-T-B based rare earth magnet is 0.80 mass % or more and 0.98 mass % or less. The R-T-B based rare earth magnet includes an R1T4B4 phase.
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公开(公告)号：US20160196904A1
公开(公告)日：2016-07-07
申请号：US14909606
申请日：2014-08-08
Applicant: TDK CORPORATION
Inventor： Isao KANADA , Hiroyuki ONO , Eiji KATO , Masashi MIWA
CPC classification number: H01F1/0551 , B22F2998/10 , B22F2999/00 , C22C38/00 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , C22C2202/02 , H01F1/0577 , B22F9/023 , B22F9/04 , B22F3/087 , B22F3/1007 , B22F3/1028 , B22F2201/20 , B22F2202/05
Abstract: The present invention provides an R-T-B based sintered magnet that inhibits the demagnetization rate at high temperature even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The R-T-B based sintered magnet includes R2T14B crystal grains and two-grain boundary parts between the R2T14B crystal grains. Two-grain boundary parts formed by R—Co—Cu-M-Fe phase exist, and M is at least one selected from the group consisting of Ga, Si, Sn, Ge and Bi.
Abstract translation: 本发明提供一种即使在使用较少或不重稀土元素如Dy，Tb等的情况下也能抑制高温退磁速度的R-T-B系烧结磁体。 R-T-B系烧结磁体包括R2T14B晶粒和R2T14B晶粒之间的双晶界面部分。 存在由R-Co-Cu-M-Fe相形成的两晶界部分，M为选自Ga，Si，Sn，Ge和Bi中的至少一种。
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Patent Agency Ranking
公开(公告)号：US20140292454A1
公开(公告)日：2014-10-02
申请号：US14229296
申请日：2014-03-28
Applicant: TDK CORPORATION
Inventor： Eiji KATO , Yoshinori FUJIKAWA , Taeko TSUBOKURA , Chikara ISHIZAKA , Katsuo SATO
IPC: H01F1/057
CPC classification number: H01F1/0571 , H01F1/0577
Abstract: The present invention provides a rare earth based magnet having a microstructure in which in a section of the R2T14B main-phase crystal grains, the number density of the fine products in the interior of (inside) the crystal grains is larger than that in the periphery of (outside) the crystal grains. That is, the rare earth based magnet includes R2T14B main-phase crystal grains and grain boundary phases formed between the R2T14B main-phase crystal grains. The R2T14B main-phase crystal grains include a substance where fine products are formed in the crystal grains. In the section of the main-phase crystal grains, when the crystal grains are divided into the interior of the crystal grains and the periphery of the crystal grains with a specific ellipse, the fine products are formed such that the number density in the interior is larger than that in the periphery.
Abstract translation: 本发明提供一种稀土类磁体，其具有微结构，其中在R2T14B主相晶粒的截面中，晶粒内部（内部）的细微产物的数量密度大于周边 （外）晶粒。 也就是说，稀土类磁体包括在R2T14B主相晶粒之间形成的R2T14B主相晶粒和晶界相。 R2T14B主相晶粒包括在晶粒中形成细小产物的物质。 在主相晶粒的截面中，当晶粒分为晶粒内部和具有特定椭圆的晶粒周边时，形成精细产物，使得内部的数量密度为 大于周边的。
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公开(公告)号：US20150310972A1
公开(公告)日：2015-10-29
申请号：US14332666
申请日：2014-07-16
Applicant: TDK CORPORATION
Inventor： Eiji KATO , Yoshinori FUJIKAWA , Taeko TSUBOKURA , Chikara ISHIZAKA , Katsuo SATO
CPC classification number: H01F1/0577 , C22C38/002 , C22C38/005 , H01F1/0536 , H01F1/086
Abstract: The present invention provides a rare earth based magnet that inhibits the high temperature demagnetization rate even when less or no heavy rare earth elements such as Dy, Tb and the like than before are used. The rare earth based magnet according to the present invention is a sintered magnet which includes R2T14B crystal grains as main phase and grain boundary phases between the R2T14B crystal grains. when evaluating the cross-sectional area distribution of the main phase crystal grains by histogram in any cross-section of the rare earth based magnet, the crystal grains with large particle size and the crystal grains with small particle size are controlled so that the cross-sectional area distribution becomes the one which respectively has at least one peak at two sides of the average value of the cross-sectional area.
Abstract translation: 本发明提供一种稀土类磁体，即使使用比以前少的或不存在稀土类元素如Dy，Tb等，也能够抑制高温退磁率。 根据本发明的稀土类磁体是包含R2T14B晶粒作为主相和R2T14B晶粒之间的晶界相的烧结磁体。 当在稀土类磁体的任何截面中通过直方图评估主相晶粒的横截面积分布时，控制粒径大的晶粒和粒径小的晶粒， 截面积分布分别成为横截面积的平均值的两侧分别具有至少一个峰。
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公开(公告)号：US20150179319A1
公开(公告)日：2015-06-25
申请号：US14579315
申请日：2014-12-22
Applicant: TDK CORPORATION
Inventor： Yoshinori FUJIKAWA , Yuki NAGAMINE , Wakako OKAWA , Chikara ISHIZAKA , Eiji KATO , Katsuo SATO
IPC: H01F1/057
CPC classification number: H01F1/057 , H01F1/0577
Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the main phases and the crystal boundary phases among R2T14B crystal grains. The microstructure of the sintered body is controlled by at least containing the first crystal boundary phases and the second crystal boundary phases, wherein the first crystal boundary phases contain at least R-T-M in the ranges of 20 to 40 atomic % for R, 60 to 75 atomic % for T and 1 to 10 atomic % for M, and the second crystal boundary phases contains at least R-T-M in the ranges of 50 to 70 atomic % for R, 10 to 30 atomic % for T and 1 to 20 atomic % for M.
Abstract translation: 本发明提供了一种稀土类磁体，其中即使Dy和Tb等重稀土元素的量与过去相比明显减少，也可以抑制高温下的退磁率，或者不存在这种重稀土 使用地球元素。 本发明的稀土类磁体是以R2T14B晶粒为主相和R2T14B晶粒之间的晶界相的烧结磁体。 烧结体的显微结构至少含有第一晶界相和第二晶界边界相，其中第一晶界相至少含有R为20〜40原子％的RTM，60〜75原子 对于T为1％，对于M为1至10原子％，并且第二晶界相至少包含在R为50至70原子％，T为10至30原子％和对于M为1至20原子％的范围内的RTM。
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公开(公告)号：US20150179318A1
公开(公告)日：2015-06-25
申请号：US14578713
申请日：2014-12-22
Applicant: TDK CORPORATION
Inventor： Yoshinori FUJIKAWA , Yuki NAGAMINE , Wakako OKAWA , Chikara ISHIZAKA , Eiji KATO , Katsuo SATO
CPC classification number: H01F1/057 , C22C33/0278 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/06 , C22C38/16 , C22C2202/02 , H01F1/0577
Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the major phases and the crystal boundary phases among the R2T14B crystal grains. The microstructure of the sintered body is controlled by including crystal boundary phases containing at least R, T and M in the crystal boundary phases, wherein the relative atomic ratios of R, T and M are as follows, i.e., 60 to 80% for R, 15 to 35% for T and 1 to 20% for M.
Abstract translation: 本发明提供了一种稀土类磁体，其中即使Dy和Tb等重稀土元素的量与过去相比明显减少，也可以抑制高温下的退磁率，或者不存在这种重稀土 使用地球元素。 本发明的稀土类磁体是包含R2T14B晶粒作为主相和R 2T14B晶粒中的晶界相的烧结磁体。 通过在晶界边界相中包含至少含有R，T和M的晶界相来控制烧结体的组织，其中R，T和M的相对原子比如下，即R为60〜80％ ，T为15〜35％，M为1〜20％
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公开(公告)号：US20140292453A1
公开(公告)日：2014-10-02
申请号：US14229253
申请日：2014-03-28
Applicant: TDK CORPORATION
Inventor： Eiji KATO , Yoshinori FUJIKAWA , Taeko TSUBOKURA , Chikara ISHIZAKA , Katsuo SATO
IPC: H01F1/057
Abstract: The present invention provides a rare earth based magnet that inhibits the high temperature demagnetization rate even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The rare earth based magnet according to the present invention includes R2T14B main phase crystal grains and grain boundary phases between adjacent main phase crystal grains. In any cross-section of the rare earth based magnet, when evaluating the circular degree of the main phase crystal grains with Wadell's Roundenss A, the shape of the main phase crystal grains is controlled such that the Roundness A becomes 0.24 or more.
Abstract translation: 本发明提供一种稀土类磁体，即使在使用Dy或Tb等稀土元素较少的情况下也能够抑制高温退磁率。 根据本发明的稀土类磁体包括相邻的主相晶粒之间的R2T14B主相晶粒和晶界相。 在稀土类磁体的任何截面中，当用Wadell's Roundens A评估主相晶粒的圆度时，控制主相晶粒的形状，使得圆度A变为0.24以上。
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