-
公开(公告)号：US20210272727A1
公开(公告)日：2021-09-02
申请号：US17259253
申请日：2019-03-08
Applicant: Hitachi, Ltd.
Inventor： Matahiro KOMURO , Yuichi SATSU
Abstract: Provided are: a sintered magnet having an improved maximum energy product while maintaining the magnetic coercivity of the magnet; and a production method for such a sintered magnet. The sintered magnet (10a) according to the present invention comprises particles (6) each including: a main phase (2) in which the main component is a compound containing a rare-earth element and iron; and a diffusion layer (1) provided on the surface of the main phase (2). The diffusion layers (1) are characterized by: containing, as a main component, a compound resulting from a solid-solution of carbon and/or nitrogen in said compound of the main phase (2); and having a concentration gradient of carbon and/or nitrogen from the surfaces of the particles (6) toward the interior thereof.
-
公开(公告)号：US20130278104A1
公开(公告)日：2013-10-24
申请号：US13924746
申请日：2013-06-24
Applicant: Hitachi, Ltd.
Inventor： Matahiro KOMURO , Yuichi SATSU , Hiroyuki SUZUKI
CPC classification number: H01F1/408 , C22C1/0441 , C22C2202/02 , H01F1/0556 , H01F1/0557 , H01F1/0577 , H01F1/058 , H01F1/0596 , H01F1/08 , H01F1/086 , H01F41/0293 , H02K1/02 , H02K1/27
Abstract: The present invention makes it possible to increase the residual magnetic flux density and the coercive force of a rare earth magnet; and raise the Curie temperature. In a magnet formed by compressing magnetic particles, the surface of a magnetic particle is covered with a metal fluoride film, the magnetic particle has a crystal structure containing a homo portion formed by bonding adjacent iron atoms and a hetero portion formed by bonding two iron atoms via an atom other than iron, and the distance between the two iron atoms in the hetero portion is different from the distance between the adjacent iron atoms in the homo portion.
Abstract translation: 本发明可以增加稀土磁体的剩余磁通密度和矫顽力; 并提高居里温度。 在通过压缩磁性颗粒形成的磁体中，磁性颗粒的表面被金属氟化物膜覆盖，磁性颗粒具有包含通过键合相邻铁原子而形成的均匀部分的晶体结构和通过键合两个铁原子形成的杂质部分 通过除铁以外的原子，并且异质部分中的两个铁原子之间的距离不同于同质部分中相邻的铁原子之间的距离。
-
公开(公告)号：US20230290551A1
公开(公告)日：2023-09-14
申请号：US18019518
申请日：2021-05-11
Applicant: Hitachi, Ltd.
Inventor： Matahiro KOMURO , Yusuke ASARI , Kazuya SHINAGAWA , Shinya TAMURA , Tomohiro TABATA , Shohei TERADA
IPC: H01F1/16 , H02K1/02 , C21D3/08 , C21D1/76 , C21D1/18 , C21D9/46 , C22C38/00 , C22C38/10 , C22C38/12 , C21D6/00
CPC classification number: H01F1/16 , H02K1/02 , C21D3/08 , C21D1/76 , C21D1/18 , C21D9/46 , C22C38/001 , C22C38/10 , C22C38/12 , C21D6/007 , C21D2211/001 , C22C2202/02
Abstract: The present invention provides a soft magnetic iron sheet exhibiting a high saturation magnetic flux density and a low iron loss as compared with an electromagnetic pure iron sheet, a method for producing the soft magnetic iron sheet, and, an iron core and a dynamo-electric machine, each using the soft magnetic iron sheet. The soft magnetic iron sheet according to the present invention includes: iron as a main component; and nitrogen, in which the soft magnetic iron sheet includes, along a thickness direction of the soft magnetic iron sheet: a high nitrogen concentration layer having a nitrogen concentration of 2 at. % to 11 at. %; a low nitrogen concentration layer having a nitrogen concentration of half or less of the nitrogen concentration of the high nitrogen concentration layer; and a nitrogen concentration transition layer connecting the nitrogen concentration of the high nitrogen concentration layer and the nitrogen concentration of the low nitrogen concentration layer, and wherein a surface layer region including at least both main surfaces of the soft magnetic iron sheet is the low nitrogen concentration layer.
-
公开(公告)号：US20220328225A1
公开(公告)日：2022-10-13
申请号：US17779158
申请日：2020-08-28
Applicant: Hitachi, Ltd.
Inventor： Matahiro KOMURO , Shohei TERADA , Yusuke ASARI
Abstract: The present invention aims at providing an iron-nitrogen-based soft magnetic steel sheet having a saturation magnetic flux density higher than that of pure iron, a method for manufacturing the soft magnetic steel sheet, and a core and a dynamo-electric machine in which the soft magnetic steel sheet is used. The soft magnetic steel sheet according to the present invention includes C, N, and the balance of Fe and inevitable impurities and is comprised of an α phase, an α′ phase, an α″ phase, and a γ phase. The α phase serves as a main phase, a volume ratio of the α″ phase is 10% or more, and a volume ratio of the γ phase is 5% or less. The core according to the present invention includes a laminated body of the soft magnetic steel sheets.
-
公开(公告)号：US20150071702A1
公开(公告)日：2015-03-12
申请号：US14462901
申请日：2014-08-19
Applicant: Hitachi, Ltd.
Inventor： Matahiro KOMURO , Naoya OKIZAKI , Masafumi NOJIMA
CPC classification number: C21D1/04 , C21D6/004 , C21D9/50 , C21D2211/001 , C21D2211/004 , C21D2211/005 , C22C38/001 , C22C38/004 , C22C38/04 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/58 , Y10T403/477
Abstract: The present invention provides a structural body comprising a welded portion of a duplex stainless steel inclusive of an α phase and a Υ phase and an unwelded portion of the duplex stainless steel, wherein an X-ray diffraction intensity for the α phase is higher in a heat affected zone including the welded portion than in the unwelded portion and becomes a local maximum within the heat affected zone. The present invention provides aA production method for a structural body of a duplex stainless steel, wherein a heat affected zone including a welded portion of the structural body is heat-treated between 600° C. and 800° C. while a magnetic field of 1˜10 T is applied to the heat affected zone.
Abstract translation: 本发明提供了一种结构体，其包括双相不锈钢的焊接部分，包括α相和Ugr; 并且在包括焊接部分的热影响区域中的α相的X射线衍射强度高于未焊接部分中的X射线衍射强度，并且在热影响区域内变为局部最大值。 本发明提供一种双相不锈钢结构体的制造方法，其特征在于，包括结构体的焊接部分的热影响区域在600℃和800℃之间进行热处理，同时磁场为1 〜10 T应用于热影响区。
-
Patent Agency Ranking
公开(公告)号：US20240233993A9
公开(公告)日：2024-07-11
申请号：US18278477
申请日：2021-09-28
Applicant: Hitachi, Ltd.
Inventor： Tomohiro TABATA , Matahiro KOMURO , Yusuke ASARI , Shinya TAMURA , Shohei TERADA
CPC classification number: H01F1/16 , C21D9/46 , C22C38/001 , C22C38/10 , C22C38/12 , C21D2211/005 , C22C2202/02
Abstract: A soft magnetic iron alloy sheet has a saturation magnetic flux density comparable to that of Permendur, with the same iron loss as electromagnetic pure iron, and a lower cost than Permendur. The soft magnetic iron alloy sheet includes, as a chemical composition, 30 at % or less of Co, 0.1 at % or more and 11 at % or less of N, and 1.2 at % or less of vanadium, with the remainder being Fe and impurities. In a thickness direction of the soft magnetic iron alloy sheet, a surface layer region has an average nitrogen concentration of 1 at % or more and 15 at % or less and an internal region has a lower average nitrogen concentration than the surface layer region. In the surface layer region, a thickness is 1% or more and 30% or less from both main surfaces of the sheet and iron-nitride martensite having a tetragonal structure is formed.
-
公开(公告)号：US20240194383A1
公开(公告)日：2024-06-13
申请号：US18286240
申请日：2022-02-18
Applicant: Hitachi, Ltd.
Inventor： Matahiro KOMURO , Tomohiro TABATA , Shinya TAMURA , Yusuke ASARI , Shohei TERADA
IPC: H01F1/20 , C21D1/18 , C21D1/76 , C21D3/08 , C21D6/00 , C21D6/04 , C21D9/46 , C22C38/00 , C22C38/10
CPC classification number: H01F1/20 , C21D1/18 , C21D1/76 , C21D3/08 , C21D6/007 , C21D6/04 , C21D9/46 , C22C38/001 , C22C38/10 , C21D2211/008 , C22C2202/02
Abstract: A soft magnetic iron alloy plate having saturation magnetic flux density higher than that of an electromagnetic pure iron plate without an excessive increase in an iron loss, a method for manufacturing the soft magnetic iron alloy plate, and an iron core and a rotating electric machine using the soft magnetic iron alloy plate are provided. A soft magnetic iron alloy plate according to the present invention includes chemical composition containing 2 to 10 at. % of N, 0 to 30 at. % of Co, 0 to 1.2 at. % of V, and a remaining portion including Fe and impurities, and in a thickness direction of the soft magnetic iron alloy plate, an outer nitrogen concentration transition region where N concentration on a main surface is 1 to 4 at. % and N concentration increases toward the inner side from the main surface, a high nitrogen concentration region where maximum N concentration is higher than N concentration of the main surface and less than 11 at. %, and a variation range of N concentration is within 1 at. %, and an inner nitrogen concentration transition region where N concentration decreases toward the inner side from the high nitrogen concentration region and minimum N concentration is lower than N concentration in the high nitrogen concentration region and is 1 at. % or more.
-
公开(公告)号：US20240136096A1
公开(公告)日：2024-04-25
申请号：US18278477
申请日：2021-09-27
Applicant: Hitachi, Ltd.
Inventor： Tomohiro TABATA , Matahiro KOMURO , Yusuke ASARI , Shinya TAMURA , Shohei TERADA
CPC classification number: H01F1/16 , C21D9/46 , C22C38/001 , C22C38/10 , C22C38/12 , C21D2211/005 , C22C2202/02
Abstract: A soft magnetic iron alloy sheet has a saturation magnetic flux density comparable to that of Permendur, with the same iron loss as electromagnetic pure iron, and a lower cost than Permendur. The soft magnetic iron alloy sheet includes, as a chemical composition, 30 at % or less of Co, 0.1 at % or more and 11 at % or less of N, and 1.2 at % or less of vanadium, with the remainder being Fe and impurities. In a thickness direction of the soft magnetic iron alloy sheet, a surface layer region has an average nitrogen concentration of 1 at % or more and 15 at % or less and an internal region has a lower average nitrogen concentration than the surface layer region. In the surface layer region, a thickness is 1% or more and 30% or less from both main surfaces of the sheet and iron-nitride martensite having a tetragonal structure is formed.
-
公开(公告)号：US20190284676A1
公开(公告)日：2019-09-19
申请号：US16345102
申请日：2017-10-25
Applicant: HITACHI, LTD.
Inventor： Matahiro KOMURO , Hisamitsu HATOU , Kazuya NONOMURA
Abstract: For providing a structural material having improved fatigue strength and abrasion resistance, provided is a structural material containing iron and carbon, including: a first layer formed of pearlite; a second layer formed of a mixed phase of martensite and a carbide; and a third layer formed of a carbide, in order from a center to a surface of the structural material. The carbide of the third layer is represented by MC (where M is one element among Ti, V, Nb, Mo, Ta, and W), and the structural material has a concentration gradient in which an M element concentration is decreased from the surface to the center of the structural material.
-
10.发明公开公开(公告)号：US20230287546A1
公开(公告)日：2023-09-14
申请号：US18019897
申请日：2021-06-01
Applicant: Hitachi, Ltd.
Inventor： Kazuya SHINAGAWA , Matahiro KOMURO , Yusuke ASARI , Shohei TERADA
CPC classification number: C22C38/105 , H01F1/20 , H02K1/02 , B22F1/142 , B22F1/054 , B22F2301/35 , B22F2304/054 , B22F2302/20 , C22C2202/02
Abstract: Provided are a soft magnetic material capable of achieving a high saturation density by reducing Co among soft magnetic materials made of a FeCo-based alloy, a method for producing a soft magnetic material, and an electric motor.
The soft magnetic material of the present invention is a soft magnetic material containing Fe and Co in a total amount of 90 mass % or more, in which: contained components are 50 mass % or more of Fe, 40 mass % or less of Co, 0.1 mass % or less of C, 2.0 mass % or less of Ni, 0.2 mass % or less of Mn, Si, Cr, Ti, Nb, and V, and inevitable impurities; and
the soft magnetic material contains a precipitate of a compound of iron and nitrogen. The precipitate is created by tension annealing a raw material of the soft magnetic material.
-
-
-
-
-
-
-
-
-
Search Results
15
records
(took 0.014 seconds)
