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公开(公告)号：US20200098496A1
公开(公告)日：2020-03-26
申请号：US16576215
申请日：2019-09-19
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA , TOHOKU UNIVERSITY
Inventor： Akihito KINOSHITA , Noritsugu SAKUMA , Tetsuya SHOJI , Daisuke ICHIGOZAKI , Tatsuhiko HIRANO , Kazuaki HAGA , Yukio TAKADA , Satoshi SUGIMOTO , Masashi MATSUURA
Abstract: To provide a rare earth magnet in which particles of SmFeN powder are bound using a Zn alloy powder, wherein generation of a knick at a magnetic field of around 0 is prevented, and a production method thereof.A rare earth magnet including a main phase containing Sm, Fe, and N, at least a part of the main phase having a Th2Zn17-type or Th2Ni17-type crystal structure, a sub-phase containing at least either Si or Sm, and Zn and Fe and being present around the main phase, and an intermediate phase containing Sm, Fe and N as well as Zn and being present between the main phase and the sub-phase, wherein the average Fe content in the sub-phase is 33 at % or less relative to the whole sub-phase, and the average total content of Si and Sm in the sub-phase is from 1.4 to 4.5 at % relative to the whole subs-phase.
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公开(公告)号：US20240290524A1
公开(公告)日：2024-08-29
申请号：US18567945
申请日：2022-06-16
Applicant: TOHOKU UNIVERSITY
Inventor： Satoshi SUGIMOTO
CPC classification number: H01F1/20 , B22F1/068 , B22F1/10 , B22F1/142 , C08J3/203 , C08K3/08 , C22C38/30 , H05K9/0081 , B22F2301/35 , B22F2999/00 , C08K2003/0856 , C08K2201/01 , C08K2201/016
Abstract: An electromagnetic absorber includes a base material formed of a polymer, and a powder dispersed in the base material. The powder is formed of an Fe—Cr—Co-based alloy having a two-phase separation structure including a first phase and a second phase. An Fe content and a Co content of the first phase are more than those of the second phase, and a Cr content of the second phase is more than that of the first phase. The two-phase separation structure is a modulated structure. Preferably, the first phase is elongated or flattened.
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公开(公告)号：US20200098497A1
公开(公告)日：2020-03-26
申请号：US16576347
申请日：2019-09-19
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA , TOHOKU UNIVERSITY
Inventor： Noritsugu SAKUMA , Tetsuya SHOJI , Akihito KINOSHITA , Kazuaki HAGA , Daisuke ICHIGOZAKI , Yukio TAKADA , Satoshi SUGIMOTO , Masashi MATSUURA
Abstract: To provide a rare earth magnet in which particles of SmFeN powder are bound using a Zn powder, wherein generation of a knick at a magnetic field of around 0 is prevented and high residual magnetic flux density Br is thereby achieved, and a production method thereof.A rare earth magnet including a main phase containing Sm, Fe, and N, at least a part of the main phase having a Th2Zn17-type or Th2Ni17-type crystal structure, a sub-phase containing Zn and Fe and being present around the main phase, and an intermediate phase containing Sm, Fe and N as well as Zn and being present between the main phase and the sub-phase, wherein the average Fe content in the sub-phase is 33 at % or less relative to the whole sub-phase.
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公开(公告)号：US20190006068A1
公开(公告)日：2019-01-03
申请号：US16013101
申请日：2018-06-20
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA , TOHOKU UNIVERSITY
Inventor： Noritsugu SAKUMA , Tetsuya SHOJI , Kazuaki HAGA , Satoshi SUGIMOTO , Masashi MATSUURA
Abstract: To provide a rare earth magnet having excellent coercive force and a production method thereof. A rare earth magnet, wherein the rare earth magnet comprises a magnetic phase containing Sm, Fe, and N, a Zn phase present around the magnetic phase, and an intermediate phase present between the magnetic phase and the Zn phase, wherein the intermediate phase contains Zn and the oxygen content of the intermediate phase is higher than the oxygen content of the Zn phase; and a method for producing a rare earth magnet, including mixing a magnetic raw material powder having an oxygen content of 1.0 mass % or less and an improving agent powder containing metallic Zn and/or a Zn alloy, and heat-treating the mixed powder.
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