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公开(公告)号：US20190074114A1
公开(公告)日：2019-03-07
申请号：US16181811
申请日：2018-11-06
Applicant: TDK Corporation
Inventor： Makoto IWASAKI , Tetsuya HIDAKA , Takuma HAYAKAWA , Ayato KAKOKI , Yoshinori FUJIKAWA , Syota GOTO , Haruna NAKAJIMA , Takeshi MASUDA , Chikara ISHIZAKA
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.
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公开(公告)号：US20180114616A1
公开(公告)日：2018-04-26
申请号：US15560795
申请日：2016-03-25
Applicant: TDK CORPORATION
Inventor： Wakako OKAWA , Syota GOTO , Yoshinori FUJIKAWA
CPC classification number: H01F1/0577 , B22F3/00 , B22F3/16 , B22F3/24 , B22F9/04 , B22F2003/248 , B22F2009/044 , B22F2201/20 , B22F2301/45 , C22C28/00 , C22C30/00 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/06 , C22C38/10 , C22C38/16 , C22C2200/00 , C22C2202/02 , H01F1/057 , H01F1/0576 , H01F1/08
Abstract: A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include B. A concentration ratio A (A=αB/βB) of the main phase grains is 1.05 or more, where αB and βB are respectively a highest concentration of B and a lowest concentration of B in one main phase grain.
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公开(公告)号：US20180108463A1
公开(公告)日：2018-04-19
申请号：US15560695
申请日：2016-03-25
Applicant: TDK CORPORATION
Inventor： Wakako OKAWA , Syota GOTO , Yoshinori FUJIKAWA
CPC classification number: H01F1/0577 , B22F3/00 , B22F3/16 , B22F3/24 , B22F9/04 , B22F2003/248 , B22F2009/044 , B22F2201/20 , B22F2301/45 , C22C28/00 , C22C30/00 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/06 , C22C38/10 , C22C38/16 , C22C2200/00 , C22C2202/02 , H01F1/057 , H01F1/0576 , H01F1/08
Abstract: A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include C. A concentration ratio A1 (A1=αC/βC) of the main phase grains is 1.50 or more, where αC and βC are respectively a highest concentration of C and a lowest concentration of C in one main phase grain.
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公开(公告)号：US20170221616A1
公开(公告)日：2017-08-03
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 , C22C38/14 , C22C38/10 , B22F3/10 , C22C38/00 , B22F1/00 , B22F9/02 , C22C38/16 , C22C38/06
CPC classification number: H01F1/0557 , B22F1/0059 , B22F3/1017 , B22F9/026 , B22F2009/044 , B22F2202/05 , B22F2301/35 , B22F2998/10 , B22F2999/00 , C22C33/02 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , C22C2202/02 , H01F1/0577 , H01F41/0293 , B22F9/023 , B22F9/04 , B22F3/02 , B22F3/10
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.
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