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公开(公告)号：US20170207011A1
公开(公告)日：2017-07-20
申请号：US15400459
申请日：2017-01-06
Applicant: TDK CORPORATION
Inventor： Hiroyuki MORITA
CPC classification number: H01F1/0306 , C04B35/26 , C04B35/2633 , C04B35/2666 , C04B35/2675 , C04B35/6261 , C04B35/62695 , C04B35/632 , C04B35/634 , C04B35/638 , C04B2235/3208 , C04B2235/3213 , C04B2235/3215 , C04B2235/3217 , C04B2235/3222 , C04B2235/3227 , C04B2235/3241 , C04B2235/3243 , C04B2235/3262 , C04B2235/3274 , C04B2235/3275 , C04B2235/3418 , C04B2235/3454 , C04B2235/5409 , C04B2235/5436 , C04B2235/5445 , C04B2235/549 , C04B2235/6021 , C04B2235/6567 , C04B2235/72 , C04B2235/726 , C04B2235/728 , C04B2235/96 , H01F1/10
Abstract: A ferrite sintered magnet includes a composition expressed by a formula (1) of Ca1-w-xLawAxFezComO19. In the formula (1), “w”, “x”, “z”, and “m” satisfy a formula (2) of 0.30≦w≦0.50, a formula (3) of 0.08≦x≦0.20, a formula (4) of 8.55≦z≦10.00, and a formula (5) of 0.20≦m≦0.40. In the formula (1), “A” is at least one kind of element selected from a group consisting of Sr and Ba. Cr is further contained at 0.058 mass % to 0.132 mass % in terms of Cr2O3.
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公开(公告)号：US20210304935A1
公开(公告)日：2021-09-30
申请号：US17201809
申请日：2021-03-15
Applicant: TDK CORPORATION
Inventor： Shogo MUROYA , Yoshitaka MURAKAWA , Hiroyuki MORITA , Masanori IKEDA
Abstract: To provide a ferrite sintered magnet having a high residual magnetic flux density (Br), a high coercive force (HcJ), a good production stability, and also able to produce at a low cost. The ferrite sintered magnet includes a hexagonal M-type ferrite including A, R, Fe, and Co in an atomic ratio of A1-xRx(Fe12-yCoy)zO19. A is at least one selected from Sr, Ba, and Pb. R is La only or La and at least one selected from rare earth elements. 0.14≤x≤0.22, 11.60≤(12-y)z≤11.99, and 0.13≤yz≤0.17 are satisfied. 0.30≤Mc≤0.63 is satisfied in which Mc is CaO content (mass %) converted from a content of Ca included in the ferrite sintered magnet.
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公开(公告)号：US20210296032A1
公开(公告)日：2021-09-23
申请号：US17207085
申请日：2021-03-19
Applicant: TDK CORPORATION
Inventor： Masanori IKEDA , Hiroyuki MORITA , Yoshitaka MURAKAWA , Shogo MUROYA
Abstract: A ferrite sintered magnet including ferrite grains having a hexagonal crystal structure. The ferrite grains satisfy 0.56≤W≤0.68 where W is an average value of circularities of the ferrite grains in a cross section parallel to an axis of easy magnetization.
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公开(公告)号：US20200312495A1
公开(公告)日：2020-10-01
申请号：US16825717
申请日：2020-03-20
Applicant: TDK Corporation
Inventor： Yoshitaka MURAKAWA , Shogo MUROYA , Hiroyuki MORITA , Masanori IKEDA
Abstract: A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of B2O3, a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]≤0.79 and [Co]/[Zn]≤0.67 when an atomic concentration of La is represented by [La], an atomic concentration of Co is represented by [Co], and an atomic concentration of Zn is represented by [Zn].
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公开(公告)号：US20210304934A1
公开(公告)日：2021-09-30
申请号：US17198517
申请日：2021-03-11
Applicant: TDK CORPORATION
Inventor： Shogo MUROYA , Yoshitaka MURAKAWA , Hiroyuki MORITA , Masanori IKEDA
Abstract: To provide a ferrite sintered magnet having a high residual magnetic flux density (Br) and a high coercive force (HcJ), and also able to produce at a low cost. The ferrite sintered magnet includes a hexagonal M-type ferrite including A, R, Fe, and Co in an atomic ratio of A1-xRx(Fe12-yCoy)zO19. A is at least one selected from Sr, Ba, and Pb. R is La only or La and at least one selected from rare earth elements. 0.13≤x≤0.23, 10.80≤(12−y)z≤12.10, and 0.13≤yz≤0.20 are satisfied.
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Patent Agency Ranking
公开(公告)号：US20210118598A1
公开(公告)日：2021-04-22
申请号：US17070469
申请日：2020-10-14
Applicant: TDK Corporation
Inventor： Yoshitaka MURAKAWA , Hiroyuki MORITA , Masanori IKEDA , Shogo MUROYA , Tomokazu ISHIKURA
Abstract: A ferrite sintered magnet 100 comprises M-type ferrite crystal grains 4 and multiple-crystal grain boundaries 6b surrounded by three or more of the M-type ferrite crystal grains 4. The ferrite sintered magnet 100 contains at least Fe, Ca, B, and Si, and contains 0.005 to 0.9 mass % of B in terms of B2O3. The multiple-crystal grain boundaries 6b contain Si and Ca, and in a case where the molar ratio of Ca to Si in the multiple-crystal grain boundaries 6b is represented by (Ca/Si)G, the following formula is satisfied. 0.1
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公开(公告)号：US20190304643A1
公开(公告)日：2019-10-03
申请号：US16295156
申请日：2019-03-07
Applicant: TDK Corporation
Inventor： Hiroyuki MORITA , Masanori IKEDA , Yoshitaka MURAKAWA , Hiroyuki ONO , Taku MURASE
IPC: H01F1/11
Abstract: The present invention provides a ferrite sintered magnet comprising (1) main phase grains containing a ferrite having a hexagonal structure, (2) two-grain boundaries formed between two of the main phase grains, and (3) multi-grain boundaries surrounded by three or more of the main phase grains. The above ferrite sintered magnet comprises Ca, R, Sr, Fe and Co, with R being at least one element selected from the group consisting of rare earth elements and Bi, and comprising at least La. The number Nm of the above main phase grains and the number Ng of the above multi-grain boundaries in the cross section including the direction of the easy magnetization axis of the above ferrite sintered magnet satisfy the formula (1A): 50%≤Nm/(Nm+Ng)≤65% (1A).
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公开(公告)号：US20190304642A1
公开(公告)日：2019-10-03
申请号：US16269612
申请日：2019-02-07
Applicant: TDK Corporation
Inventor： Masanori IKEDA , Hiroyuki MORITA , Yoshitaka MURAKAWA , Taku MURASE
Abstract: A ferrite sintered magnet comprising ferrite particles having a hexagonal structure is provided. The ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1). In formula (1), R is at least one element selected from the group consisting of rare-earth elements and Bi, and comprises at least La. In formula (1), w, x, z and m satisfy formulae (2) to (5). The above-mentioned ferrite sintered magnet comprises 0.037 to 0.181% by mass of B in terms of H3BO3. Ca1−w−xRwSrxFezCom (1) 0.360≤w≤0.420 (2) 0.110≤x≤0.173 (3) 8.51≤z≤9.71 (4) 0.208≤m≤0.269 (5)
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公开(公告)号：US20190304641A1
公开(公告)日：2019-10-03
申请号：US16267400
申请日：2019-02-05
Applicant: TDK Corporation
Inventor： Hiroyuki MORITA , Masanori IKEDA , Yoshitaka MURAKAWA , Taku MURASE
Abstract: There is provided a ferrite sintered magnet having a high residual magnetic flux density.A ferrite sintered magnet 2 includes a plurality of main phase particles 5 including ferrite having a hexagonal structure, the number of core-shell structured particles 5A having a core 7 and a shell 9 covering the core 7, among the main phase particles 5, is smaller than the number of the main phase particles 5 other than the core-shell structured particles 5A.
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10.发明申请公开(公告)号：US20140097378A1
公开(公告)日：2014-04-10
申请号：US14070842
申请日：2013-11-04
Applicant: TDK CORPORATION
Inventor： Shigeki YANAGIDA , Takahiro MORI , Hiroyuki MORITA , Nobuhiro SUTO , Tatsuya KATOH , Yoshihiko MINACHI
IPC: H01F1/01
CPC classification number: H01F1/01 , C04B35/2633 , C04B35/2641 , C04B35/6261 , C04B35/62695 , C04B35/632 , C04B35/63408 , C04B35/63424 , C04B35/638 , C04B2235/32 , C04B2235/3201 , C04B2235/3203 , C04B2235/3206 , C04B2235/3208 , C04B2235/3213 , C04B2235/3215 , C04B2235/3217 , C04B2235/3227 , C04B2235/3232 , C04B2235/3239 , C04B2235/3241 , C04B2235/3244 , C04B2235/3251 , C04B2235/3256 , C04B2235/3258 , C04B2235/3262 , C04B2235/3277 , C04B2235/3279 , C04B2235/3281 , C04B2235/3284 , C04B2235/3286 , C04B2235/3287 , C04B2235/3293 , C04B2235/3294 , C04B2235/3409 , C04B2235/3418 , C04B2235/3427 , C04B2235/5409 , C04B2235/5436 , C04B2235/5445 , C04B2235/6022 , C04B2235/605 , C04B2235/6562 , C04B2235/6588 , C04B2235/767 , C04B2235/786 , C04B2235/787 , C04B2235/788 , H01F1/10 , H01F1/11
Abstract: A ferrite magnet and a ferrite sintered magnet including a ferrite magnetic material are provided. A main phase of the ferrite magnetic material includes a ferrite phase having a hexagonal crystal structure, and metal element composition expressed by Ca1-w-x-yR wSr xBayFezMm wherein 0.25
Abstract translation: 提供铁氧体磁铁和包括铁氧体磁性材料的铁氧体烧结磁体。 铁素体磁性材料的主相包括具有六方晶系结构的铁素体相和由Ca1-wx-yR wSr xBayFezMm表示的金属元素组成，其中0.25
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