公开(公告)号：US20220148771A1

公开(公告)日：2022-05-12

申请号：US17438690

申请日：2020-03-13

Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY

Inventor： Yusuke HIRAYAMA ,  Akihide HOSOKAWA ,  Kenta TAKAGI

IPC: H01F1/059 ,  C30B29/52 ,  H01F7/02

Abstract: A single crystal particle powder having a crystal structure of TbCu7-type of the present invention is represented by the general formula: [Chemical Formula 1] (R1-zMz)Tx  (1) or the general formula: [Chemical Formula 2] (R1-zMz)TxNy  (2) and has a crystal structure of TbCu7-type, wherein R is at least one element selected from the group consisting of Sm and Nd, T is at least one element selected from the group consisting of Fe and Co, x is 7.0≤x≤10.0, y is 1.0≤y≤2.0, and z is 0.0≤z≤0.3.

公开(公告)号：US20190333661A1

公开(公告)日：2019-10-31

申请号：US16505287

申请日：2019-07-08

Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY ,  Murata Manufacturing Co., Ltd.

Inventor： Kenta TAKAGI ,  Wataru YAMAGUCHI ,  Takaaki YOKOYAMA ,  Kenji SAKAGUCHI ,  Kazuhiro YOSHII ,  Yuji YOKOYAMA

IPC: H01F1/059 ,  H01F1/053 ,  H01F1/06 ,  B22F3/14 ,  B22F9/04 ,  B22F1/02

Abstract: A sintered magnet contains Sm—Fe—N-based crystal grains and has high coercivity; and a magnetic powder is capable of forming a sintered magnet without lowering the coercivity even if heat is generated in association with the sintering. A sintered magnet comprises a crystal phase composed of a plurality of Sm—Fe—N-based crystal grains and a nonmagnetic metal phase present between the Sm—Fe—N crystal grains adjacent to each other, wherein a ratio of Fe peak intensity IFe to SmFeN peak intensity ISmFeN measured by an X-ray diffraction method is 0.2 or less. A magnetic powder comprises Sm—Fe—N-based crystal particles and a nonmagnetic metal layer covering surfaces of the Sm—Fe—N crystal particles.

公开(公告)号：US20220189669A1

公开(公告)日：2022-06-16

申请号：US17593090

申请日：2020-01-10

Applicant: TDK CORPORATION ,  NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY

Inventor： Suguru SATOH ,  Yasushi ENOKIDO ,  Shusuke OKADA ,  Kenta TAKAGI

IPC: H01F1/059 ,  H01F41/02 ,  C23C8/26 ,  C22C1/04 ,  C22C28/00 ,  C22C32/00 ,  C30B29/52

Abstract: One embodiment of the present invention includes single-crystal particles of a TbCu7 type samarium-iron-nitrogen based alloy in an anisotropic magnet powder.

公开(公告)号：US20180318923A1

公开(公告)日：2018-11-08

申请号：US16031891

申请日：2018-07-10

Applicant: Murata Manufacturing Co., Ltd. ,  NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY

Inventor： Satoshi OGA ,  Kenta TAKAGI ,  Kimihiro OZAKI

IPC: B22F1/00 ,  H01F1/059 ,  C22C38/00 ,  H01F41/02

CPC classification number: B22F1/0085 ,  B22F1/00 ,  B22F1/0088 ,  C22C38/00 ,  C22C38/005 ,  H01F1/059 ,  H01F41/02 ,  H01F41/0253

Abstract: A raw material for a magnet, which comprises Sm and Fe. A magnet is obtained by nitriding this raw material for a magnet. In particular, a raw material for a magnet comprises an Sm—Fe binary alloy as a main component. An intensity ratio of an Sm2Fe17 (024) peak to an SmFe7 (110) peak is less than 0.001 as measured by an X-ray diffraction method.