-
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。
-
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。
-
公开(公告)号：US10410777B2
公开(公告)日：2019-09-10
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 , B22F1/00 , C22C38/00 , H01F1/057 , C22C38/02 , C22C38/06 , C22C38/10 , C22C38/16 , H02K1/02 , H02K1/27 , H01F41/02
Abstract: An R-T-B based sintered magnet has 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.
-
Patent Agency Ranking
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
-
公开(公告)号：US10388443B2
公开(公告)日：2019-08-20
申请号：US15015462
申请日：2016-02-04
Applicant: TDK CORPORATION
Inventor： Masashi Miwa , Takurou Iwasa , Haruna Nakajima
Abstract: The present invention provides an R-T-B based sintered magnet having an R-T-B based compound as main phase grains, wherein, the content of Zr contained in the R-T-B based sintered magnet is 0.3 mass % to 2.0 mass %, the main phase grains have Zr, and the R-T-B based sintered magnet have main phase grains with the mass concentration of Zr at the edge portion of the main phase grain being 70% or less of that at the central portion of the main phase grain at the cross-section of the main phase grain.
-
公开(公告)号：US10256015B2
公开(公告)日：2019-04-09
申请号：US14906682
申请日：2014-08-08
Applicant: TDK Corporation
Inventor： Masashi Miwa , Haruna Nakajima , Isao Kanada
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 crystal grains, wherein, an R—Ga—Co—Cu—N concentrated part exists in a grain boundary formed between or among two or more adjacent R2T14B crystal grains, and the concentrations of R, Ga, Co, Cu and N in the R—Ga—Co—Cu—N concentrated part are higher than those in the R2T14B crystal grains respectively.
-
公开(公告)号：US10242777B2
公开(公告)日：2019-03-26
申请号：US15420151
申请日：2017-01-31
Applicant: TDK Corporation
Inventor： Makoto Iwasaki , Tetsuya Hidaka , Takuma Hayakawa , Ayato Kakoki , Yoshinori Fujikawa , Syota Goto , Haruna Nakajima , Takeshi Masuda , Chikara Ishizaka
IPC: H01F1/055 , B22F1/00 , B22F3/10 , B22F9/02 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , H01F1/057 , H01F41/02 , B22F9/04 , C22C33/02
Abstract: Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.
-
公开(公告)号：US10096410B2
公开(公告)日：2018-10-09
申请号：US14889069
申请日：2014-07-03
Applicant: TDK CORPORATION
Inventor： Masashi Miwa , Haruna Nakajima , Koji Mitake , Chikara Ishizaka
Abstract: An R-T-B based sintered magnet having R2T14B crystal grains and a grain boundary formed by two or more adjacent R2T14B crystal grains. An R—Co—Cu—N concentrated part whose concentrations of R, Co, Cu and N are respectively higher than those in the R2T14B crystal grains may be in the grain boundary. An R—O—C concentrated part or an R—O—C—N concentrated part may be further provided in the grain boundary.
-
-
-
-
-
-
-
Search Results
8
records
(took 0.016 seconds)
