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公开(公告)号：US09514869B2
公开(公告)日：2016-12-06
申请号：US14378432
申请日：2013-02-13
Applicant: TDK CORPORATION
Inventor： Masashi Miwa , Haruna Nakajima , Ken-ichi Nishikawa , Tetsuya Hidaka , Jun Hagiwara , Chikara Ishizaka
CPC classification number: H01F1/057 , B22F3/10 , C22C38/00 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , H01F1/0577 , H01F7/02
Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and an area of the R—O—C concentrated part occupying in that of the grain boundary on a cut surface of the R-T-B based sintered magnet is within a range of 10% or more to 75% or less.
Abstract translation: 本发明提供一种包含R2T14B晶粒的R-T-B系烧结磁体，其中： 晶界由两个或更多个相邻的R2T14B晶粒形成，其中R，O和C的浓度分别高于R2T14B晶粒中的R-O-C浓缩部分在晶界中，并且 在RTB型烧结磁体的切断面上占据晶界边界的R-O-C浓缩部分的面积在10％以上至75％以下的范围。
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公开(公告)号：US20150235750A1
公开(公告)日：2015-08-20
申请号：US14378428
申请日：2013-02-13
Applicant: TDK CORPORATION
Inventor： Masashi Miwa , Haruna Nakajima , Ken-ichi Nishikawa , Tetsuya Hidaka , Jun Hagiwara , Chikara Ishizaka
IPC: H01F7/02
CPC classification number: H01F7/021 , B22F1/0007 , B22F3/02 , B22F3/24 , B22F2003/248 , B22F2202/05 , B22F2999/00 , C22C33/0278 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , H01F1/0577
Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and a ratio (O/R) of O atom to R atom in the R—O—C concentrated part satisfies the following formula (1): 0.4
Abstract translation: 本发明提供一种包含R2T14B晶粒的R-T-B系烧结磁体，其中： 晶界由两个或更多个相邻的R2T14B晶粒形成，其中R，O和C的浓度分别高于R2T14B晶粒中的R-O-C浓缩部分在晶界中，并且 R-O-C浓缩部分中的O原子与R原子的比率（O / R）满足下式（1）：0.4 <（O / R）<0.7。
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公开(公告)号：US10726983B2
公开(公告)日：2020-07-28
申请号：US15439975
申请日：2017-02-23
Applicant: TDK Corporation
Inventor： Jun Hagiwara , Fumitaka Baba , Makoto Iwasaki , Satoshi Koga
Abstract: A rare earth magnet capable of reducing an eddy current loss by virtue of a low-cost, simple configuration, when mounted in a motor, is to be provided. The rare earth magnet can include a magnet body that includes a rare earth element and iron; and a resistive layer formed on at least one surface of the magnet body, the resistive layer comprising a rare earth element, iron, and oxygen and having an average volume resistivity of 103 Ωcm or more and a thickness of from 3 to 25 μm.
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公开(公告)号：US09773599B2
公开(公告)日：2017-09-26
申请号：US14378428
申请日：2013-02-13
Applicant: TDK CORPORATION
Inventor： Masashi Miwa , Haruna Nakajima , Ken-ichi Nishikawa , Tetsuya Hidaka , Jun Hagiwara , Chikara Ishizaka
CPC classification number: H01F7/021 , B22F1/0007 , B22F3/02 , B22F3/24 , B22F2003/248 , B22F2202/05 , B22F2999/00 , C22C33/0278 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , H01F1/0577
Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and a ratio (O/R) of O atom to R atom in the R—O—C concentrated part satisfies the following formula (1): 0.4
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