公开(公告)号：US20140205485A1

公开(公告)日：2014-07-24

申请号：US14220672

申请日：2014-03-20

Applicant: Hitachi, Ltd.

Inventor： Kazuya NISHI ,  Yasuhisa AONO

IPC: H01F1/20 ,  H01F1/24 ,  H01F1/22

CPC classification number: H01F1/20 ,  B22F2003/248 ,  B22F2009/0828 ,  B22F2998/10 ,  C22C33/0257 ,  C22C2202/02 ,  H01F1/22 ,  H01F1/24 ,  H01F41/0246 ,  Y10T428/12181 ,  B22F9/082 ,  B22F9/023 ,  B22F1/02 ,  B22F3/02 ,  B22F3/24

Abstract: A water atomized Fe powder for a magnetic compact reduced in deformation resistance during molding and annealing temperature for removing strains is provided. A compact having improved magnetic properties is also provided. The water atomized powder containing at least one element selected from Nb, Ta, Ti, Zr and V in an amount of 0.001-0.03 atom % is soft magnetic and has a precipitation in the matrix, which is composed of at least one element selected from Nb, Ta, Ti, Zr and V and oxygen as a main component and has an average size of 0.02-0.5 μm. Disclosed is a method for manufacturing a soft magnetic powder includes adding at least one element selected from Nb, Ta, Ti, Zr and V, and annealing in a hydrogen-containing reduction atmosphere. This method decrease gaseous impurities, particularly oxygen, and defuse it, to improve the magnetic properties of the powder and compact.

Abstract translation: 提供了一种用于磁性结合体的水雾化Fe粉末，在模制期间降低了变形阻力，并且提供了用于去除应变的退火温度。 还提供了具有改善的磁性能的压块。 含有0.001-0.03原子％的选自Nb，Ta，Ti，Zr和V中的至少一种元素的水雾化粉末是软磁性的，并且在基体中具有沉淀，该沉淀物由至少一种选自 Nb，Ta，Ti，Zr和V，氧为主要成分，平均粒径为0.02-0.5μm。 公开了一种制造软磁性粉末的方法，包括添加至少一种选自Nb，Ta，Ti，Zr和V的元素，并在含氢还原气氛中进行退火。 该方法减少了气体杂质，特别是氧气，并使其易于除去，从而提高了粉末的磁性能和致密性。

公开(公告)号：US20210193898A1

公开(公告)日：2021-06-24

申请号：US16076182

申请日：2016-02-19

Applicant: Hitachi, Ltd.

Inventor： Kazuya NISHI ,  Takaaki SUZUKI ,  Hideki TANAKA

IPC: H01L39/14 ,  H01B12/10 ,  H01L39/24 ,  H01B13/00

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.

公开(公告)号：US20200090835A1

公开(公告)日：2020-03-19

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

IPC: H01B12/10 ,  G01R33/3815 ,  H01F6/06 ,  H01F6/00 ,  H01L39/24 ,  H01L39/14

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.

公开(公告)号：US20190295746A1

公开(公告)日：2019-09-26

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 ,  H01F6/06 ,  G01R33/3815 ,  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.

公开(公告)号：US20190035519A1

公开(公告)日：2019-01-31

申请号：US16072897

申请日：2017-01-10

Applicant: HITACHI, LTD.

Inventor： Motomune KODAMA ,  Hideki TANAKA ,  Hiroshi KOTAKI ,  Kazuya NISHI ,  Takaaki SUZUKI

IPC: H01B12/06 ,  G01R33/3815 ,  A61B5/055 ,  H01B12/10 ,  H01B13/00 ,  H01F6/06 ,  H01B1/02

Abstract: The present invention addresses the problem of providing a wire material capable of ensuring high critical current density, regardless of the cross-sectional shape thereof. This super-conducting wire material is equipped with an MgB2 filament, the number density of cavities having a major axis of 10 μm or higher in a longitudinal cross-section of the superconducting wire material is in the range of 5-500 mm−2, and the average value of the angle formed between the major axis of the cavities and the axis of the wire material is 60 degrees or more.