公开(公告)号：WO1990013517A1

公开(公告)日：1990-11-15

申请号：PCT/JP1990000580

申请日：1990-05-02

Applicant: NIPPON STEEL CORPORATION ,  MORITA, Mitsuru ,  MIYAMOTO, Katsuyoshi ,  SAWANO, Kiyoshi ,  MATSUDA, Shouichi

Inventor： NIPPON STEEL CORPORATION

IPC: C01G03/00

CPC classification number: C04B35/45 ,  C04B35/4504 ,  C04B35/4508 ,  H01L39/126 ,  H01L39/2419 ,  H01L39/248 ,  Y10S505/725 ,  Y10S505/729 ,  Y10S505/733 ,  Y10S505/742 ,  Y10S505/785

Abstract: A superconductor comprising oxides of rhenium, barium and copper or an assembly thereof, wherein crystal orientations of the (123) phase in the matrix are aligned and there is no large tilt boundary having a difference in orientation of 20° or above and the (211) phase has a finely dispersed structure. It is shaped in sheet or wire form and the c axes of the crystals of the shaped article are aligned at an angle of ±30° or less or in a range of 60 to 120° with respect to a normal of the plane of the shaped article. This superconductor is produced by placing the shaped article in a heating furnace and shifting a temperature zone wherein grains are formed in the (123) phase of the matrix of the shaped article, i.e. a temperature zone of 1050 to 910°C having a gradient of at least 2°C starting with one end of the shaped article toward the other end thereof at a rate of 0.4 cm/h or less.

公开(公告)号：WO02056318A8

公开(公告)日：2002-10-31

申请号：PCT/JP0200254

申请日：2002-01-16

Applicant: NIPPON STEEL CORP ,  MORITA MITSURU

Inventor： MORITA MITSURU

IPC: H01B12/02 ,  H01B12/04 ,  H01F6/06 ,  H01F7/06 ,  H01L39/02 ,  H01L39/14 ,  H01B13/00

CPC classification number: H01L39/143 ,  H01B12/02 ,  H01B12/04 ,  H01F6/06 ,  H01F7/06 ,  H01L39/02 ,  Y02E40/641

Abstract: A low resistance conductor using superconductors, which is a conductor in the form of a plurality of super conductors held in usual transmission connection or a conductor consisting of a superconductor and a usual transmission conductor, characterized in that the apparent specific resistance of the conductor at the superconduction transition temperature or below is lower than the specific resistance of cupper at the superconduction transition temperature.

Abstract translation: 使用超导体的低电阻导体，其为保持在通常传输连接中的多个超导体形式的导体或由超导体和通常的传输导体组成的导体，其特征在于，导体在 超导转变温度低于铜超导电转变温度下的电阻率。

公开(公告)号：WO1991019029A1

公开(公告)日：1991-12-12

申请号：PCT/JP1991000769

申请日：1991-06-07

Applicant: NIPPON STEEL CORPORATION ,  MORITA, Mitsuru ,  KIMURA Keiichi ,  MIYAMOTO, Katsuyoshi ,  SAWANO, Kiyoshi ,  TAKEBAYASHI, Seiki ,  TANAKA, Masamoto

Inventor： NIPPON STEEL CORPORATION

IPC: C30B29/22

CPC classification number: H01L39/2419 ,  C04B35/4508 ,  C04B35/653 ,  C30B11/00 ,  C30B29/225 ,  H01L39/128 ,  Y10S505/778 ,  Y10S505/779 ,  Y10S505/78 ,  Y10S505/785

Abstract: A superconductor comprising a composite oxide of rare earth elements (RE), barium and copper, wherein RE2BaCuO5 phases (211 phases) are finely dispersed in a single crystal REBa2Cu3O7-x phase (123 phase) and the 123 phase is composed of a multiplicity of layers corresponding to the composition of the RE arranged in the order of the 123 phase forming temperature; and a process for producing the superconductor which comprises forming a layer from a powdery mixture of oxides of the RE, barium and copper and also layers from other powdery mixtures of oxides of RE, barium and copper corresponding to other compositions of RE having different 123 phase forming temperatures from that of the abovementioned composition of RE to give a multilayered structure wherein the multiplicity of the layers are laminated in the ascending or descending order of the 123 phase forming temperatures thereof, press forming the laminate into a precursor, placing the precursor on a support material in such a manner that the layer having the highest 123 phase forming temperature among them forms the outermost layer, bringing it into a semi-molten state by heating in a temperature range where solid and liquid are coexistent, and cooling it slowly in the 123 phase forming temperature range, optionally after seeding with seed crystals, to grow 123 phase crystals at a rate of 5 mm/hr or less.

公开(公告)号：WO1989012028A1

公开(公告)日：1989-12-14

申请号：PCT/JP1989000577

申请日：1989-06-06

Applicant: NIPPON STEEL CORPORATION ,  MORITA, Mitsuru ,  MIYAMOTO, Katsuyoshi ,  MURAKAMI, Masato ,  MATSUDA, Shoichi

Inventor： NIPPON STEEL CORPORATION

IPC: C01G03/00

CPC classification number: H01L39/126 ,  C04B35/4508 ,  C04B35/653 ,  H01L39/2419

Abstract: An oxide superconductive material of a structure wherein RE2BaCuO5-phase particles of 20 mum or less in diameter are dispersed in an REBa2Cu3O7-y phase (wherein RE represents a rare earth element including Y) is disclosed. This superconductive material is obtained by melting a superconductive oxide composition of RE, Ba and Cu, rapidly quenching and solidifying it to obtain a platy or linear product, heating it to a temperature range of 1000 to 1350°C to make it half-molten, and gradually cooling it at a rate not higher than 200°C.

公开(公告)号：WO1992022077A1

公开(公告)日：1992-12-10

申请号：PCT/JP1992000673

申请日：1992-05-25

Applicant: NIPPON STEEL CORPORATION ,  MORITA, Mitsuru

Inventor： NIPPON STEEL CORPORATION

IPC: H01F07/22

CPC classification number: F25D3/10 ,  H01F6/04

Abstract: A method and a device are provided to cool an oxide superconductor material using liquid nitrogen to a temperature lower than its boiling point. There are two kinds of cooling, i.e., cooling under reduced pressure and cooling under ordinary pressure. The reduced-pressure cooling device has a coil-accommodating chamber which is a reduced-pressure vessel. The pressure in the coil-accommodating chamber is reduced by a pressure-reducing pump, whereby the liquid nitrogen assumes a temperature of the triple point. The ordinary-pressure cooling device has a cooling portion of the refrigerator in the coil-accommodating chamber, and in which the liquid nitrogen is cooled down to its melting point.