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Re123 oxide superconductor and method for manufacturing same

A technology of RE123 and manufacturing method, which is applied in the field of RE123 oxide superconductors and its manufacturing, and can solve the problems of slow film formation

Inactive Publication Date: 2008-03-19
INT SUPERCONDUCTIVITY TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have a slow film formation rate and have problems in terms of mass productivity.

Method used

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  • Re123 oxide superconductor and method for manufacturing same
  • Re123 oxide superconductor and method for manufacturing same
  • Re123 oxide superconductor and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0187] Make the mixed raw material with a particle size of about 0.05 μm (the Er of 1-5 μm 2 BaO 4 Powder and Ba x -Cu y -O z Department of raw materials [BaCuO 2 +CuO] to get ErBa 2 Cu 3 o 7-δ The mixing ratio is mixed, and then Ag 2 (O added 2% by mass of Ag, pulverized for 10 hours) adhered to the Ag substrate, and heated at 900°C for 3 hours in an Ar atmosphere containing 1% oxygen to form ErBa 2 Cu 3 o 7-δ superconductor.

[0188] By pairing the resulting ErBa 2 Cu 3 o 7-δ X-ray diffraction intensity measurement of superconductors and scanning electron microscope (SEM) observation of the crystal surface confirmed that ErBa with excellent crystal orientation was stably formed on the entire surface of the Ag substrate at low temperature. 2 Cu 3 o 7-δ superconductor.

[0189] This indicates that crystal orientation at low temperature can be sufficiently performed by reducing the particle diameter of the mixed raw material to less than 1 μm.

[0190] In addi...

Embodiment 2

[0192] The same mixed raw material used in Example 1 was uniaxially molded into a 6 mm pellet (pellet) shape, packed into an Ag tube with an inner diameter of 6 mm and an outer diameter of 10 mm, and then processed to reduce the cross section, and processed into a width of 3 mm, Ribbon wire with a thickness of 1mm.

[0193] Then, heat-treat the strip-shaped wire rod in the atmosphere at 920°C, then cut a 100mm-long wire sample from the wire rod, slowly cool it in an oxygen stream from 700°C to 400°C for 200 hours, and introduce Oxygen.

[0194] The critical current characteristic of the wire sample was measured by the 4-terminal method, and the critical current density was 880A / cm 2 .

Embodiment 3

[0196] Make the mixed raw material with a particle size of about 0.1 μm (the Er of 1-5 μm 2 BaO 4 Powder and Ba x -Cu y -O z Department of raw materials [BaCuO 2 +CuO] to get ErBa 2 Cu 3 o 7-δ Mixed at a mixing ratio of 4% by mass of Ag2O, then pulverized for 4 hours) filled into an Ag tube with an inner diameter of 6 mm, an outer diameter of 12 mm, and a length of 20 cm, and the reduced section was processed into a plate thickness of 0.3 mm to make a flat plate shaped Ag armored wire material.

[0197] The above materials were heated at 925°C for 8 minutes in an Ar atmosphere containing 1% oxygen, followed by heating at (a) 875°C, (b) 850°C, (c) 825°C, and (d) 800°C Treated for 2 hours, ErBa was formed 2 Cu 3 o 7-δ superconductor.

[0198] By pairing the resulting ErBa 2 Cu 3 o 7-δ X-ray diffraction intensity measurement and scanning electron microscope (SEM) observation of the crystal surface confirmed that: after heat treatment at 925°C for 8 minutes, followe...

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Abstract

Disclosed is a long RE123 oxide superconductor stably having excellent superconducting characteristics at liquid nitrogen temperature, which can be used as a strand for a single-core or multicore wire material. Also disclosed is a method for mass-producing such a superconductor. Specifically disclosed is an RE123 oxide superconductor characterized by being composed of a conductive layer containing an REBa2Cu3O7-d oxide superconductor, which is made by using a mixed raw material including at least RE2BaO4 and a Bax-Cuy-Oz raw material, and a holding member for holding the conductive layer. In this connection, RE represents one or more elements selected from La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu and Y.

Description

technical field [0001] The present invention relates to an RE123-based oxide superconductor (superconductor) and a method for producing the same. Background technique [0002] Bi-based and Y-based oxide superconductor materials, and Nb 3 Compared with metal superconductor materials such as Sn, the critical temperature (T c ) is high, it can be greatly expected to be used as a wire rod for electromagnets and power transmission. [0003] Bi-based oxide superconductor materials are already in the stage of practical use (see JP-A-3-138820), but when a magnetic field is applied parallel to the c-axis, the irreversible temperature at 77K (cooling temperature using liquid nitrogen) The magnetic field (Birr) is as low as 0.5T or less, so even if it is made into a wire, its application is limited. [0004] On the other hand, with REBa 2 Cu 3 o 7-δ Compared with the Bi-based oxide superconductor material, the superconductor (hereinafter referred to as "RE123-based oxide supercon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/06C01G1/00C01G3/00C04B35/00H01B13/00
CPCY02E40/641Y02E40/64Y02E40/642Y02E40/60
Inventor 田中昭二坂井直道町敬人M·米尔亚拉
Owner INT SUPERCONDUCTIVITY TECH CENT
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