公开(公告)号：US20220157498A1

公开(公告)日：2022-05-19

申请号：US17598508

申请日：2020-03-27

Applicant: TDK Corporation

Inventor： Masashi OHMURA ,  Junichi NAGAOKA ,  Shogo MUROYA ,  Takuma ABE ,  Jo SATO

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

Abstract: A ferrite sintered magnet has a ferrite phase having a magnetoplumbite-type crystal structure, and contains at least a metal element A, a metal element R, Fe, Co, Zn, and B. The element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca. The element R is at least one kind of element selected from the group consisting of Bi and rare-earth elements including Y, and essentially includes La. Atomic ratios of the metal elements satisfy the following expressions. A1-rRrFexCoyZnz  (1) 0.40≤r≤0.70  (2) 8.20≤x≤9.34  (3) 0.05

公开(公告)号：US20140361214A1

公开(公告)日：2014-12-11

申请号：US14456325

申请日：2014-08-11

Applicant: TDK Corporation

Inventor： Junichi NAGAOKA ,  Takahiro MORI ,  Hiroyuki MORITA ,  Yoshihiko MINACHI

IPC: H01F1/10

CPC classification number: H01F1/10 ,  C01G49/0054 ,  C01G51/006 ,  C01P2002/30 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/12 ,  C04B35/2633 ,  C04B35/2641 ,  C04B35/6261 ,  C04B35/6263 ,  C04B35/632 ,  C04B2235/32 ,  C04B2235/3203 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3224 ,  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 ,  C04B2235/447 ,  C04B2235/448 ,  C04B2235/5409 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/549 ,  C04B2235/605 ,  C04B2235/6562 ,  C04B2235/661 ,  C04B2235/72 ,  C04B2235/726 ,  C04B2235/727 ,  C04B2235/767 ,  C04B2235/785 ,  C04B2235/786 ,  C04B2235/85 ,  C04B2235/94 ,  C04B2235/95 ,  H01F1/11

Abstract: An object of the present invention is to provide a ferrite magnetic material which can provide a permanent magnet retaining high Br and HcJ as well as having high Hk/HcJ. The ferrite magnetic material according to a preferred embodiment is a ferrite magnetic material formed of hard ferrite, wherein a P content in terms of P2O5 is 0.001% by mass or more.

Abstract translation: 本发明的目的是提供一种能够提供保持高Br和HcJ的永磁体以及具有高Hk / HcJ的铁氧体磁性材料。 根据优选实施方案的铁氧体磁性材料是由硬质铁氧体形成的铁氧体磁性材料，其中以P 2 O 5计的P含量为0.001质量％以上。