公开(公告)号：US20180277288A1

公开(公告)日：2018-09-27

申请号：US15928378

申请日：2018-03-22

申请人： TDK CORPORATION

发明人： Makoto IWASAKI ,  Tetsuya HIDAKA ,  Eiji KATO ,  Takuma HAYAKAWA ,  Hidetake KITAOKA

IPC分类号： H01F1/057 ,  C22C38/16 ,  C22C38/14 ,  C22C38/10 ,  C22C38/06 ,  C22C38/00 ,  C22C38/04

摘要： 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.

公开(公告)号：US20240321491A1

公开(公告)日：2024-09-26

申请号：US18612333

申请日：2024-03-21

申请人： TDK Corporation

发明人： Takuma HAYAKAWA

IPC分类号： H01F1/057 ,  B22F3/16 ,  B22F3/24 ,  B22F9/02 ,  B22F9/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16

CPC分类号： H01F1/0577 ,  B22F3/16 ,  B22F3/24 ,  B22F9/023 ,  B22F9/04 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  B22F2003/242 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2201/02 ,  B22F2201/11 ,  B22F2201/20 ,  B22F2202/05 ,  B22F2301/355 ,  B22F2304/10 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02

摘要： An R-T-B based permanent magnet includes at least a rare earth element, Fe, Co, Si, Zr, Ga, and B. The rare earth element includes a heavy rare earth element. The R-T-B based permanent magnet has a rare earth element content of 28.50 mass % to 31.50 mass %, a heavy rare earth element content of 0.30 mass % or less excluding 0 mass %, a Co content of 0.20 mass % to 1.00 mass %, a Si content of 0.35 mass % to 1.20 mass %, a Zr content of 0.21 mass % to 0.85 mass %, a Ga content of 0.04 mass % to 0.40 mass %, a B content of 0.90 mass % to 1.02 mass %, and a C content of 0 mass % to 0.11 mass %.

公开(公告)号：US20180287441A1

公开(公告)日：2018-10-04

申请号：US15936790

申请日：2018-03-27

申请人： TDK CORPORATION

发明人： Hidetake KITAOKA ,  Makoto IWASAKI ,  Tetsuya HIDAKA ,  Eiji KATO ,  Takuma HAYAKAWA

IPC分类号： H02K1/27 ,  H02K9/19

摘要： 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.

公开(公告)号：US20240321490A1

公开(公告)日：2024-09-26

申请号：US18610601

申请日：2024-03-20

申请人： TDK Corporation

发明人： Takuma HAYAKAWA

IPC分类号： H01F1/057 ,  B22F3/16 ,  B22F3/24 ,  B22F9/02 ,  B22F9/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  H01F41/02

CPC分类号： H01F1/0577 ,  B22F3/162 ,  B22F3/24 ,  B22F9/023 ,  B22F9/04 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  B22F2003/242 ,  B22F2003/247 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2201/11 ,  B22F2201/20 ,  B22F2202/05 ,  B22F2301/355 ,  B22F2304/10 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02 ,  H01F41/0266 ,  H01F41/0293

摘要： An R-T-B based permanent magnet has a heavy rare earth element content of 0.30 mass % or less excluding 0 mass %. The R-T-B based permanent magnet is either an R-T-B based permanent magnet including at least a rare earth element, Fe, Co, Al, Zr, Ga, B, and C within predetermined ranges; or an R-T-B based permanent magnet including main phase grains including crystal grains having an R2T14B type crystal structure and a grain boundary between two or more of the main phase grains adjacent to each other, having an R—Fe—Co—Ga—Al concentrated portion in the grain boundary.

公开(公告)号：US20180294082A1

公开(公告)日：2018-10-11

申请号：US15967893

申请日：2018-05-01

申请人： TDK CORPORATION

发明人： Tetsuya HIDAKA ,  Takuma HAYAKAWA ,  Makoto IWASAKI ,  Ayato KAKOKI

IPC分类号： H01F1/057 ,  H01F41/02 ,  C22C38/16 ,  C22C38/14 ,  C22C38/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/10 ,  H01F1/058

摘要： An R-T-B based sintered magnet includes “R”, “T”, and “B”. “R” represents a rare earth element. “T” represents a metal element other than rare earth elements including at least Fe, Cu, Mn, Al, Co, Ga, and Zr. “B” represents boron or boron and carbon. With respect to 100 mass % of a total mass of the R-T-B based sintered magnet, a content of “R” is 28.0 to 31.5 mass %, a content of Cu is 0.04 to 0.50 mass %, a content of Mn is 0.02 to 0.10 mass %, a content of Al is 0.15 to 0.30 mass %, a content of Co is 0.50 to 3.0 mass %, a content of Ga is 0.08 to 0.30 mass %, a content of Zr is 0.10 to 0.25 mass %, and a content of “B” is 0.85 to 1.0 mass %.

公开(公告)号：US20210305852A1

公开(公告)日：2021-09-30

申请号：US17208185

申请日：2021-03-22

申请人： TDK Corporation

发明人： Takuma HAYAKAWA

IPC分类号： H02K1/02 ,  H01F41/02 ,  H01F7/02 ,  H01F1/057

摘要： A rare earth permanent magnet has a first surface and satisfies A1

公开(公告)号：US20180025820A1

公开(公告)日：2018-01-25

申请号：US15656284

申请日：2017-07-21

申请人： TDK Corporation

发明人： Ayato KAKOKI ,  Makoto IWASAKI ,  Tetsuya HIDAKA ,  Takuma HAYAKAWA

IPC分类号： H01F1/057 ,  B22F3/16 ,  B22F9/04 ,  C22C30/02 ,  C22C28/00

CPC分类号： H01F1/0577 ,  B22F3/16 ,  B22F9/04 ,  B22F2009/044 ,  B22F2201/11 ,  B22F2202/05 ,  B22F2301/45 ,  B22F2998/10 ,  B22F2999/00 ,  C22C28/00 ,  C22C30/02 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C2202/02 ,  H01F41/0293 ,  B22F9/023 ,  B22F1/0059 ,  B22F3/087 ,  B22F3/14 ,  B22F2003/248

摘要： An R-T-B based sintered magnet containing a first heavy rare earth element, in which R includes Nd, T includes Co and Fe, the first heavy rare earth element includes Tb or Dy, the R-T-B based sintered magnet has a region in which a concentration of the first heavy rare earth element decreases from the surface toward the inside, a first grain boundary phase which contains the first heavy rare earth element and Nd but does not contain Co is present in one cross section including the region, and an area occupied by the first grain boundary phase in one cross section including the region is 1.8% or less.

公开(公告)号：US20170103836A1

公开(公告)日：2017-04-13

申请号：US15285113

申请日：2016-10-04

申请人： TDK CORPORATION

发明人： Tetsuya HIDAKA ,  Takuma HAYAKAWA ,  Makoto IWASAKI ,  Ayato KAKOKI

IPC分类号： H01F1/057 ,  C22C38/14 ,  H01F1/058 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C22C38/16 ,  C22C38/10

CPC分类号： H01F1/0577 ,  C22C38/002 ,  C22C38/005 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  H01F1/058 ,  H01F41/0293

摘要： An R-T-B based sintered magnet includes “R”, “T”, and “B”. “R” represents a rare earth element. “T” represents a metal element other than rare earth elements including at least Fe, Cu, Mn, Al, Co, Ga, and Zr. “B” represents boron or boron and carbon. With respect to 100 mass % of a total mass of the R-T-B based sintered magnet, a content of “R” is 28.0 to 31.5 mass %, a content of Cu is 0.04 to 0.50 mass %, a content of Mn is 0.02 to 0.10 mass %, a content of Al is 0.15 to 0.30 mass %, a content of Co is 0.50 to 3.0 mass %, a content of Ga is 0.08 to 0.30 mass %, a content of Zr is 0.10 to 0.25 mass %, and a content of “B” is 0.85 to 1.0 mass %.

公开(公告)号：US20190074114A1

公开(公告)日：2019-03-07

申请号：US16181811

申请日：2018-11-06

申请人： TDK Corporation

发明人： Makoto IWASAKI ,  Tetsuya HIDAKA ,  Takuma HAYAKAWA ,  Ayato KAKOKI ,  Yoshinori FUJIKAWA ,  Syota GOTO ,  Haruna NAKAJIMA ,  Takeshi MASUDA ,  Chikara ISHIZAKA

IPC分类号： H01F1/055 ,  H01F41/02 ,  H01F1/057

摘要： 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：US20180286544A1

公开(公告)日：2018-10-04

申请号：US15936752

申请日：2018-03-27

申请人： TDK CORPORATION

发明人： Takuma HAYAKAWA ,  Makoto IWASAKI ,  Tetsuya HIDAKA ,  Eiji KATO ,  Hidetake KITAOKA

IPC分类号： H01F1/057 ,  H01F41/02

摘要： Provided is an alloy for R-T-B based rare earth magnet. “R” is one or more of a rare earth element, ‘T’ is one or more of a transition metal element essentially including Fe or Fe and Co, and “B” is boron. The alloy includes a single or a plural number of main phase (A), having a minimum length of 10 μm or more and a maximum length of 30 μm or more and 300 μm or less, in a cross section cut along a thickness direction of the alloy. The main phase (A) includes an R2T14B phase, and an area ratio of the main phase (A) to an entire cross section is 2% or more and 60% or less.