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公开(公告)号：US11616188B2
公开(公告)日：2023-03-28
申请号：US16076182
申请日：2016-02-19
Applicant: Hitachi, Ltd.
Inventor： Kazuya Nishi , Takaaki Suzuki , Hideki Tanaka
Abstract: Proposed is a novel embedded structure for suppressing a disturbance in the cross sectional shape and a non-uniform deformation of a metal member arising in a precursor when producing an MgB2 multi-core wire material by a surface reduction process. This superconductive multi-core wire material precursor is characterized by having: soft Cu and Fe pure metals disposed in the center; mixed powder elements, each comprising as a sheath material a metal such as Fe or Nb having a barrier effect preventing a reaction between Mg and Cu, the mixed powder elements being disposed in a form that surrounds the periphery of the soft metal serving as the central material; and disposed around these, an outer shell layer produced from a harder metal than the central material and the sheath material.
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公开(公告)号：US11387017B2
公开(公告)日：2022-07-12
申请号：US16479274
申请日：2018-02-26
Applicant: HITACHI, LTD.
Inventor： Motomune Kodama , Hideki Tanaka , Takaaki Suzuki , Junichi Shimoyama
Abstract: The following two problems arise when carbon is added to a starting material powder in the process of production of an MgB2 superconductor: (1) an impurity phase increases; and (2) the degree of substitution of carbon at boron sites is spatially non-uniform. This superconductor production method comprises: a mixing step of mixing a starting material powder and an additive; and a heat treatment step of heat-treating the mixture prepared in the mixing step. The starting material powder is MgB2 powder or a mixed powder of magnesium and boron, and the additive is an Mg—B—C compound containing three elements of magnesium, boron and carbon.
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公开(公告)号：US20200294693A1
公开(公告)日：2020-09-17
申请号：US16754921
申请日：2018-11-02
Applicant: Hitachi, Ltd.
Inventor： Motomune Kodama , Hideki Tanaka , Takaaki Suzuki , Hiroshi Kotaki
IPC: H01B12/00
Abstract: The purpose of the present invention is to provide a method for causing sufficient deformation in precursor particles even when a soft high-purity metal is used for an outer layer material in mechanical milling, and manufacturing an MgB2 superconducting wire. A method for manufacturing an MgB2 superconducting wire in which an MgB2 filament is covered by an outer layer material, the method comprising: subjecting magnesium powder and boron powder to a shock that is insufficient for MgB2 to be clearly produced, and producing precursor particles in which boron particles are dispersed inside a magnesium matrix; filling a metal tub with the precursor particles; processing the metal tube filled with precursor particles to form a wire; and heat-treating the wire to synthesize the MgB2; wherein the method is characterized in that a portion of the wire-drawing step includes swaging.
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公开(公告)号：US11562836B2
公开(公告)日：2023-01-24
申请号：US16092231
申请日：2017-03-10
Applicant: HITACHI, LTD.
Inventor： Motomune Kodama , Shigeho Tanigawa , Hiroshi Kotaki , Hideki Tanaka , Kazuya Nishi , Takaaki Suzuki
Abstract: The present invention is intended to increase the critical current density of a wire rod having a shape with good symmetry such as a round wire or a square wire by making use of mechanical milling method. The production method of the present invention for the MgB2 superconducting wire rod comprises a mixing process of preparing a powder by adding a solid organic compound to a magnesium powder and a boron powder and then applying an impact to the powder to prepare a mixture of the powder in which boron particles are dispersed inside magnesium particles, a filling process of filling a metal tube with the mixture, an elongation process of elongating the metal tube filled with the mixture and a heat treatment process of heat-treating the metal tube to synthesize MgB2.
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Patent Agency Ranking
公开(公告)号：US11127514B2
公开(公告)日：2021-09-21
申请号：US15746871
申请日：2015-07-24
Applicant: Hitachi, Ltd.
Inventor： Hideki Tanaka , Kazuya Nishi , Takaaki Suzuki , Yota Ichiki
IPC: H01B12/10 , G01R33/3815 , H01F6/06 , H01B12/04 , C01B35/04
Abstract: It is an object of the present invention to provide an MgB2 wire helping to achieve compatibility between the ease with which superconducting connection is effected and thermal stability. A superconducting wire according to the present invention includes: an elemental wire formed of MgB2; and a first metal not reacting with Mg. In a section orthogonal to the longitudinal direction of the superconducting wire, the region extending from the center of the superconducting wire to the installation position of the elemental wire is formed by the elemental wire and the first metal.
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公开(公告)号：US11837380B2
公开(公告)日：2023-12-05
申请号：US17053839
申请日：2019-02-27
Applicant: HITACHI, LTD.
Inventor： Takaaki Suzuki , Hideki Tanaka , Motomune Kodama
Abstract: Provided are: a superconducting wire rod in which the non-uniform deformation of the shape of an MgB2 core material has been controlled; a superconducting coil; a magnetic generator; and a method for producing a superconducting wire rod. A superconducting wire rod (100A) according to the present invention comprises: a center material (106) of which at least the outer circumferential surface is formed of a metal that does not react with Mg; a plurality of single-core wires (103) disposed around the center material (106), each of the single-core wires having an MgB2 superconductor core material (101) coated with a first coating material (102) made of a metal that does not react with Mg; and an outer shell material (105) disposed outside the plurality of single-core wires (103), wherein at least the inner circumferential surface of the outer shell material (105) is formed of a metal that does not react with Mg.
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公开(公告)号：US11694824B2
公开(公告)日：2023-07-04
申请号：US16754921
申请日：2018-11-02
Applicant: Hitachi, Ltd.
Inventor： Motomune Kodama , Hideki Tanaka , Takaaki Suzuki , Hiroshi Kotaki
IPC: H01B12/00
CPC classification number: H01B12/00
Abstract: The purpose of the present invention is to provide a method for causing sufficient deformation in precursor particles even when a soft high-purity metal is used for an outer layer material in mechanical milling, and manufacturing an MgB2 superconducting wire. A method for manufacturing an MgB2 superconducting wire in which an MgB2 filament is covered by an outer layer material, the method comprising: subjecting magnesium powder and boron powder to a shock that is insufficient for MgB2 to be clearly produced, and producing precursor particles in which boron particles are dispersed inside a magnesium matrix; filling a metal tub with the precursor particles; processing the metal tube filled with precursor particles to form a wire; and heat-treating the wire to synthesize the MgB2; wherein the method is characterized in that a portion of the wire-drawing step includes swaging.
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公开(公告)号：US10121955B2
公开(公告)日：2018-11-06
申请号：US15100702
申请日：2013-12-20
Applicant: HITACHI, LTD.
Inventor： Hideki Tanaka , Tsuyoshi Wakuda
Abstract: An object of the present invention is to provide a persistent current switch with high heating efficiency by simplifying the configuration of the persistent current switch and reducing the heat capacity. To achieve the object, a superconducting magnet in accordance with the present invention includes a superconducting coil, a persistent current switch, and one of an alternating-current power supply, a pulsed power supply, or a charge/discharge circuit. The one of the alternating-current power supply, the pulsed power supply, or the charge/discharge circuit is connected to a loop circuit of the superconducting coil and the persistent current switch such that it is in parallel with the persistent current switch.
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公开(公告)号：US12087467B2
公开(公告)日：2024-09-10
申请号：US17279187
申请日：2019-09-17
Applicant: HITACHI, LTD.
Inventor： Hideki Tanaka , Takaaki Suzuki , Motomune Kodama , Manabu Aoki
CPC classification number: H01B12/04 , G01R33/34023 , H01F6/06 , H10N60/0856 , H10N60/202
Abstract: The present invention addresses a problem of providing an MgB2 wire material having a small reversible bending radius, a superconducting coil using the same, and an MRI without lowering a critical current value and a critical current density of the MgB2 wire material to an extreme. To solve the problem, provided are a superconducting wire having a plurality of MgB2 strands and a first base metal, a superconducting coil using the same, and an MRI, the superconducting wire being characterized in that in a cross section orthogonal to a wire longitudinal direction, a center point of an area surrounded by the plurality of MgB2 strands and a center axis of a cross section of the superconducting wire are disposed in separated positions.
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