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公开(公告)号:US11990259B2
公开(公告)日:2024-05-21
申请号:US18013072
申请日:2021-03-31
CPC分类号: H01F1/0551 , B22F1/05 , B22F1/10 , C08K9/02 , C22C38/001 , C22C38/005 , B22F2301/355 , B22F2304/10 , C08K2201/005 , C08K2201/01
摘要: A rare earth-iron-nitrogen-based magnetic powder according to this invention contains, as main constituent components, a rare-earth element (R), iron (Fe), and nitrogen (N). Moreover, this magnetic powder has an average particle size of 1.0-10.0 μm, and contains 22.0-30.0 mass % of a rare-earth element (R) and 2.5-4.0 mass % of nitrogen (N). Further, this magnetic powder includes: a core part having any one crystal structure among a Th2Zn17 type, a Th2Ni17 type, and a TbCu7 type; and a shell layer provided on the surface of the core part and having a thickness of 1-30 nm. The shell layer contains a rare-earth element (R) and iron (Fe) so that the R/Fe atomic ratio is 0.3-5.0, and further contains 0-10 at % (exclusive of 0) of nitrogen (N). Furthermore, this magnetic powder contains compound particles composed of a rare-earth element (R) and phosphorus (P).
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公开(公告)号:US20230245807A1
公开(公告)日:2023-08-03
申请号:US18013072
申请日:2021-03-31
CPC分类号: H01F1/0551 , B22F1/05 , B22F1/10 , C22C38/005 , C22C38/001 , C08K9/02 , B22F2304/10 , B22F2301/355 , C08K2201/01 , C08K2201/005
摘要: A rare earth-iron-nitrogen-based magnetic powder according to this invention contains, as main constituent components, a rare-earth element (R), iron (Fe), and nitrogen (N). Moreover, this magnetic powder has an average particle size of 1.0-10.0 μm, and contains 22.0-30.0 mass % of a rare-earth element (R) and 2.5-4.0 mass % of nitrogen (N). Further, this magnetic powder includes: a core part having any one crystal structure among a Th2Zn17 type, a Th2Ni17 type, and a TbCu7 type; and a shell layer provided on the surface of the core part and having a thickness of 1-30 nm. The shell layer contains a rare-earth element (R) and iron (Fe) so that the R/Fe atomic ratio is 0.3-5.0, and further contains 0-10 at % (exclusive of 0) of nitrogen (N). Furthermore, this magnetic powder contains compound particles composed of a rare-earth element (R) and phosphorus (P).
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公开(公告)号:US11476020B2
公开(公告)日:2022-10-18
申请号:US16013101
申请日:2018-06-20
摘要: 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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公开(公告)号:US20230162897A1
公开(公告)日:2023-05-25
申请号:US17897265
申请日:2022-08-29
CPC分类号: H01F1/055 , C22C38/12 , C22C38/10 , C22C38/005 , C22C2202/02
摘要: A magnet material is represented by a composition formula 1: RxNbyBxM100x-y-z, R is at least one element selected from the group consisting of rare-earth elements, M is at least one element selected from the group consisting of Fe and Co, x is a number satisfying 4≤x≤10 atomic %, y is a number satisfying 0.1≤y≤8 atomic %, and z is a number satisfying 0.1≤z≤12 atomic %. The magnet material includes: a main phase having a TbCu7 crystal phase; and a grain boundary phase. The magnet material satisfies a relation of nNb2/nNb1>5, where nNb1 is an average Nb concentration in the TbCu7 crystal phase and nNb2 is a maximum Nb concentration in the grain boundary phase.
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