公开(公告)号：US20150255198A1

公开(公告)日：2015-09-10

申请号：US14638819

申请日：2015-03-04

Applicant: TDK CORPORATION

Inventor： Yoshitaka MURAKAWA ,  Naoharu TANIGAWA ,  Yoshihiko MINACHI ,  Hitoshi TAGUCHI

IPC: H01F1/03 ,  H02K1/02

CPC classification number: H01F1/0315 ,  C01G49/0072 ,  C01P2002/50 ,  C01P2002/52 ,  C01P2004/54 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/42 ,  C04B35/26 ,  C04B35/62685 ,  C04B2235/3201 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3227 ,  C04B2235/3241 ,  C04B2235/3262 ,  C04B2235/3275 ,  C04B2235/3284 ,  C04B2235/3418 ,  C04B2235/5409 ,  C04B2235/605 ,  C04B2235/72 ,  C04B2235/767 ,  C04B2235/785 ,  C04B2235/96 ,  H01F1/11 ,  H02K1/02

Abstract: A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO and M1/M2 is 0.43 or less when an amount of a rare-earth element (R) is M1 in terms of mol and the amount of Zn is M2 in terms of mol.

Abstract translation: 烧结铁氧体磁体包括具有六方晶体结构的M型Sr铁氧体的主相。 Zn的量以Zn计为0.05〜1.35质量％，当稀土元素（R）的量为M1时，M1 / M2为0.43以下，Zn的量为M2时，为 mol。

公开(公告)号：US20230290547A1

公开(公告)日：2023-09-14

申请号：US18199721

申请日：2023-05-19

Applicant: TDK Corporation

Inventor： Junnichi NAGAOKA ,  Hitoshi TAGUCHI ,  Yuichi SUGAWARA ,  Jo SATO

IPC: H01F1/11 ,  C04B35/26 ,  C04B35/626 ,  C04B35/64 ,  H02K1/02 ,  H01F1/113 ,  H01F1/10

CPC classification number: H01F1/11 ,  C04B35/2633 ,  C04B35/6262 ,  C04B35/62625 ,  C04B35/64 ,  H02K1/02 ,  H01F1/113 ,  H01F1/10 ,  C04B2235/3274 ,  C04B2235/3409 ,  C04B2235/3418 ,  C04B2235/605 ,  C04B2235/606 ,  C04B2235/6567 ,  C04B2235/76

Abstract: Provided is a ferrite sintered magnet including a ferrite phase having a magnetoplumbite-type crystal structure. x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba. The content of B in the ferrite sintered magnet is from 0.1% to 0.6% by mass in terms of B2O3.


0.2≤x≤0.8  (1)



0.1≤y≤0.65  (2)



3≤m≤14  (3)

公开(公告)号：US20150255197A1

公开(公告)日：2015-09-10

申请号：US14638635

申请日：2015-03-04

Applicant: TDK CORPORATION

Inventor： Yoshitaka MURAKAWA ,  Naoharu TANIGAWA ,  Yoshihiko MINACHI ,  Hitoshi TAGUCHI

IPC: H01F1/03 ,  H02K1/02

CPC classification number: H01F1/0315 ,  C01G49/0036 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/12 ,  C04B35/26 ,  C04B35/62685 ,  C04B2235/3201 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3227 ,  C04B2235/3241 ,  C04B2235/3262 ,  C04B2235/3275 ,  C04B2235/3284 ,  C04B2235/3418 ,  C04B2235/5409 ,  C04B2235/605 ,  C04B2235/72 ,  C04B2235/767 ,  C04B2235/785 ,  C04B2235/96 ,  H01F1/11 ,  H02K1/02

Abstract: A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO, the sintered ferrite magnet does not substantially include a rare-earth element (R), and the following Formula (1) is satisfied, where a total amount of Sr, Ba and Ca is M3 in terms of mol, a total amount of Fe, Co, Mn, Zn, Cr and Al is M4 in terms of mol, and an amount of Si is M5 in terms of mol. 0.5≦{M3−(M4/12)}/M5≦4.8  (1)

Abstract translation: 烧结铁氧体磁体包括具有六方晶体结构的M型Sr铁氧体的主相。 Zn的量为ZnO为0.05〜1.35质量％，烧结铁氧体磁体基本上不包含稀土元素（R），并且满足下式（1），其中，Sr，Ba Ca为M3，以摩尔计，Fe，Co，Mn，Zn，Cr和Al的总量以摩尔计为M4，Si的量以摩尔计为M5。 0.5＆nlE; {M3-（M4 / 12）} / M5＆nlE; 4.8（1）

公开(公告)号：US20190318856A1

公开(公告)日：2019-10-17

申请号：US16469833

申请日：2017-12-22

Applicant: TDK Corporation

Inventor： Junnichi NAGAOKA ,  Hitoshi TAGUCHI ,  Yuichi SUGAWARA ,  Jo SATO

IPC: H01F1/11 ,  H02K1/02 ,  C04B35/26 ,  C04B35/626 ,  C04B35/64

Abstract: Provided is a ferrite sintered magnet including a ferrite phase having a magnetoplumbite-type crystal structure. x, y, and m satisfy the following Equations (1), (2), and (3) when composition of the ferrite sintered magnet is represented by R1-xAxFem-yCoy, where R denotes at least one kind of element selected from rare earth elements including Y and A denotes Ca or Ca and elements including at least one kind selected from Sr or Ba. The content of B in the ferrite sintered magnet is from 0.1% to 0.6% by mass in terms of B2O3. 0.2≤x≤0.8  (1) 0.1≤y≤0.65  (2) 3≤m

公开(公告)号：US20190206594A1

公开(公告)日：2019-07-04

申请号：US16302751

申请日：2017-05-19

Applicant: TDK CORPORATION

Inventor： Junnichi NAGAOKA ,  Hitoshi TAGUCHI

IPC: H01F1/03 ,  H01F1/10 ,  C01G49/00 ,  C01G51/00 ,  C04B35/26 ,  C04B35/626

CPC classification number: H01F1/0315 ,  C01G49/00 ,  C01G49/0054 ,  C01G51/68 ,  C04B35/26 ,  C04B35/2633 ,  C04B35/62645 ,  H01F1/10 ,  H01F1/11

Abstract: This ferrite magnet has a ferrite phase having a magnetoplumbite structure, and an orthoferrite phase, and is characterized in that the composition ratios of the total of each metal element A, R, Fe and Me is represented by expression (1) A1-xRx(Fe12-yMey)z, (in expression (1), A is at least one element selected from Sr, Ba, Ca and Pb; R is at least one element selected from the rare-earth elements (including Y) and Bi, and includes at least La, and Me is Co, or Co and Zn) and in that the content (m) of the orthoferrite phase is 0

公开(公告)号：US20190122792A1

公开(公告)日：2019-04-25

申请号：US16302704

申请日：2017-05-19

Applicant: TDK CORPORATION

Inventor： Junnichi NAGAOKA ,  Hitoshi TAGUCHI

IPC: H01F1/11 ,  C01G49/00 ,  C04B35/26 ,  H01F1/03

Abstract: This ferrite magnet has a magnetoplumbite structure and is characterized in that, when representing the composition ratios of the total of each metal element A, R, Fe and Me with expression (1) A1-xRx(Fe12-yMey)z, the Fe2+ content (m) in the ferrite magnet is greater than 0.1 mass % and less than 5.4 mass % (in expression (1), A is at least one element selected from Sr, Ba, Ca and Pb; R is at least one element selected from the rare-earth elements (including Y) and Bi, and includes at least La, and Me is Co, or Co and Zn). The invention makes it possible to achieve a ferrite magnet with increased Br.

公开(公告)号：US20150325350A1

公开(公告)日：2015-11-12

申请号：US14379667

申请日：2013-02-20

Applicant: TDK Corporation

Inventor： Hitoshi TAGUCHI

IPC: H01F1/11 ,  H02K1/02

CPC classification number: H01F1/11 ,  C04B35/26 ,  C04B35/62685 ,  C04B2235/3201 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3272 ,  C04B2235/3418 ,  C04B2235/442 ,  C04B2235/5409 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/5454 ,  C04B2235/602 ,  C04B2235/72 ,  C04B2235/767 ,  C04B2235/782 ,  C04B2235/785 ,  C04B2235/788 ,  H02K1/02

Abstract: Provided is a sintered ferrite magnet 10 that comprises Sr ferrite having a hexagonal crystal structure, wherein the total amount of Na and K is 0.004 to 0.31% by mass in terms of Na2O and K2O, an amount of Si is 0.3 to 0.94% by mass in terms of SiO2, and the following Expression (1) is satisfied. 1.3≦(SrF+Ba+Ca+2Na+2K)/Si≦5.7  (1) [In Expression (1), SrF represents an amount of Sr, on a molar basis, other than Sr which constitutes the Sr ferrite, and Ba, Ca, Na, and K represent amounts of respective elements on a molar basis.]

Abstract translation: 提供一种烧结铁氧体磁体10，其包含具有六方晶结构的Sr铁氧体，其中Na和K的总量以Na 2 O和K 2 O表示为0.004至0.31质量％，Si的量为0.3至0.94质量％ 以SiO 2计，满足以下表达式（1）。 1.3＆nlE;（SrF + Ba + Ca + 2Na + 2K）/ Si＆nlE; 5.7（1）[表达式（1））SrF表示构成Sr铁氧体的不同于Sr的Sr的摩尔数， Ba，Ca，Na和K表示相对于摩尔数的各元素的量。