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WO2005088651A1 - Fils multifilaments supraconducteurs mgb2, films utilisant un supraconducteur nb-ti comme tube et substrat - Google Patents

Fils multifilaments supraconducteurs mgb2, films utilisant un supraconducteur nb-ti comme tube et substrat Download PDF

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Publication number
WO2005088651A1
WO2005088651A1 PCT/KR2005/000488 KR2005000488W WO2005088651A1 WO 2005088651 A1 WO2005088651 A1 WO 2005088651A1 KR 2005000488 W KR2005000488 W KR 2005000488W WO 2005088651 A1 WO2005088651 A1 WO 2005088651A1
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Prior art keywords
mgb2
superconducting
superconductor
tube
substrate
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PCT/KR2005/000488
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English (en)
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Hun-Bong Lee
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H01B12/06—Films or wires on bases or cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H01B12/10—Multi-filaments embedded in normal conductors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/01—Manufacture or treatment
    • H10N60/0856—Manufacture or treatment of devices comprising metal borides, e.g. MgB2
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/20—Permanent superconducting devices
    • H10N60/202—Permanent superconducting devices comprising metal borides, e.g. MgB2

Definitions

  • This invention is related to superconducting multifilamentary wires and films. Giving a more detail of this invention, Nb-Ti superconductor are used as a tube (the tube in the Powder In Tube process) in the case of superconducting wire and Nb-Ti superconductor are used as a substrate in the case of superconducting film, Background Art
  • Nb-Ti superconductor The well-known Nb-Ti superconductor was discovered in 1960.
  • the Nb-Ti superconductor was developed as a multifilamentary superconducting wire which have several Cu matrices in 1970.
  • This multifilamentary superconducting wire is electronically stable, therefore it is typical of the applied superconductor wires.
  • Nb-Ti multifilamentary superconducting wires which are mentioned above are fabricated by the start of cold-drawing in the Cu matrix(tube). Then the specimens are heat treated in 300 - 400°C for annealing. During annealing, fine Ti phases are precipitated. The critical current density(Jc) of multifilamentary superconducting wire is enhanced by these fine Ti phases which are pinning center. These processes( cold- drawing and annealing) are repeated to enhance Jc and change demensions.
  • Nb-Ti multifilamentary superconducting wire are restrained in their practical applications, because of it's superconducting transition temperature (around 9K). This means that it can only be used in liquid helium state. Therefore wide use of Nb-Ti multifilamentary superconducting wires is not possible.
  • Drawing 4 shows a cross section of Nb-Ti multifilamentary superconducting wire.
  • superconducting wire is generally composed of shielding metal(30) which coats the entire wire and superconducting filament(l ⁇ ) which consist of a multi-state and tube(20) which coat the superconducting filament.
  • MgB2 is simple intermetallic compound composed by Magnesium and Boron, but it is very brittle in bulk form. It is impossible to direct draw and roll it for wires, film and tapes. Therefore usually PIT(powder in tube) method is used to fabricate MgB2 wires like the high Tc oxide superconductor. One of the most important factors in PIT method is selecting the tube metal.
  • Mg has high reactivity with oxygen and other materials, and because B also has a high melting point, it is very difficult to select a suitable tube metal for a MgB2 superconducting wire.
  • Fe, Nb, Cu, stainless steel and other metals have not been satisfactory and many problems remain in practical applications.
  • MgB2 superconductor do not get out of the vacumm processes which are ABAD(ion beam assisted deposition), PLD(pulse laser deposition) and others. Moreover, substrates are not free from single cry stalls such as A12O3. A variety of metal substrates have been studied such as Fe, Ni, stainless steel and Nb for long length film, but the results have not been satisfactory. It is difficult to select metal substrates for film because of Mg's high reactivity with oxygen and other metals, Mg's high volatility and B's high melting point. That many problems limit practical applications that MgB2 film has.
  • This invention is created to compensate for these problems which have been mentioned.
  • This invention is relate to superconducting multifilamentary wire and films.
  • This invention uses Nb-Ti superconductor as a tube(the tube in the Powder In Tube process) and MgB2 is used as a filaments.
  • Nb-Ti superconductors are used as a substrate and MgB2 is deposited on the Nb-Ti superconductor.
  • the purpose of this invention is to provide MgB2 superconducting multifilamentary wire and film using Nb-Ti superconductor as the tube and substrate.
  • this invention have the object that MgB2 superconducting multifilamentary wires and films which superconducting critical tempe rature is 39K by using Nb-Ti superconductor as a tube and substrate, are supplied.
  • Nb-Ti superconductors are used as a tube and MgB2 is used as the filament in the Nb-Ti tube.
  • Nb-Ti superconductors are used as a substrate and MgB2 is deposited on the Nb-Ti substrate.
  • This configuration makes it desirable to include Cu based alloy as the shielding metal. And this configuration also makes it desirable to include the barrier of Nb etc between the shielding metal and the NbTi superconductor as well as between NbTi superconductor and MgB2 superconductor Advantageous Effects
  • this invention takes advantages of suppling superconducting wires and films that show superconducting property of NbTi+MgB2 below 9K which is Nb-Ti superconducting transition temperature and show MgB2 superconducting property from 9K to 39K
  • Drawings 1, 2, 3 are cross-sections of MgB2 multifilamentary superconducting wire using Nb-Ti superconductor as a tube. They are composed of a superconducting Nb-Ti tube(200), superconducting MgB2 filament(lOO) and a copper alloy shielding metal(300). In addition, a barrier of Nb etc(400) is between shielding metal(300) and Nb-Ti tube(200), and also between the MgB2 filament(lOO) and Nb-Ti tube(200).
  • Drawing 4 is a cross-section of Nb-Ti multifilamentary superconducting wire. They are composed of a superconducting Nb-Ti filament(l ⁇ ), a tube(20) of coating thd filament, and shielding metal(30) coating the entire wire
  • Drawings 5 - 11 are cross sections of a variety of films using Nb-Ti superconductor as a substrate
  • FIGS 1, 2 and 3 show a cross section of a MgB2 multifilamentary wire which use Nb-Ti superconductor as a tube according to this invention.
  • this invention is composed of a Nb-Ti tube(200), MgB2 filament(lOO) and a Cu based shielding metal(300).
  • This invention can add a barrier(Nb etc,400) between the MgB2(100) and the NbTi tube(200), and between the NbTi tube(200) and shielding metal(300).
  • Genernally superconducting wires which are shown in drawing 4, are composed of superconducting filaments(l ⁇ ), and a tube(20), which coats the filaments, and the metal shielding(30), which coats the entire external wire.
  • the superconducting filaments(lOO) are composed of MgB2
  • the tube(200) is composed of NbTi superconductor
  • the metal shielding(300) is composed of a copper-based alloy.
  • MgB2 is a superconductor with a critical temperature of 39K, and performs best at critical temperature among the nonoxide superconductor.
  • Nb-Ti is wellknown metal superconductor with a critical temperature of 9K. Since the drawing processes for NbTi superconducting wires are well known and are well developed, Nb-Ti superconducting wire is widely used.
  • Nb-Ti superconductor which has been used as a filament, is used as a tube(200), the filament(lOO), which is inserted into the tube, is MgB2.
  • MgB2 which is inserted into the Nb-Ti tube is composed of MgB2 powder, Boron powder, Mg+B powder, MgB2+X powder, Mg+B+X powder and a compound of powders which are changed to MgB2 during heat treatment.
  • X indicates an element or a compound which enhances flux pinning effect or reduces the porosity of MgB2. It can be Nb, Ta, Ti, Fe, W etc. Finally as they are heat treated at 600-950°C in an inert gas or vacuum, they become superconducting MgB2 multifilamentary wire .
  • this wires can have a 400-a barrier(Nb etc) between MgB2(100) and NbTi tube(200) and 400-b barrier(Nb etc) between NbTi tube(200) and shielding metal(300).
  • FIGS 5-11 show the cross sections of MgB2 superconducting film using Nb-Ti superconductor as a substrate according to this invention.
  • this invention is composed of a Nb-Ti superconducting substrate, MgB2, which is deposited on the substrate, and shielding material.
  • a barrier(Nb etc) can be added between the substrate and MgB2, and between the substrate and shielding material.
  • superconducting films are generally composed of a buffer layer to reduce reactivity and enhance alignment between the substrate and deposited superconducting material.
  • MgB2 is the deposited superconducting material
  • Nb-Ti is the substrate
  • YSZ and A12O3 etc are the buffer layers.
  • the Nb-Ti superconductor which has been used as a filament in the wire,is used as a substrate, and MgB2 is the superconducting material which is deposited on the substrate.
  • the deposited MgB2 is composed of one or more in MgB2 powders, Boron powders, Mg+B powders, MgB2+X powders, Mg+B+X powders and a compound of powders which are changed to MgB2 during heat treatment.
  • X is an element or a compound which enhances flux pinning effect or reduces the porosity of MgB2 such as Nb, Ta, Ti, Fe, W, etc.
  • MgB2 All deposition methods are available for depositing MgB2, such as PLD(Pulser Laser Deposition), ED(Electro Deposition), CVD(Chemical Vapor Deposition), EPD(Electro-Phoretic Deposition), MB, IBAD, sol gel method, etc.
  • PLD Physical Laser Deposition
  • ED Electro Deposition
  • CVD Chemical Vapor Deposition
  • EPD Electro-Phoretic Deposition
  • MB Industrial Vapor Deposition
  • IBAD Industrial Vapor Deposition
  • sol gel method sol gel method
  • the supeconducting films can have a barrier(Nb etc) added between the substrate and MgB2, and between the substrate and shielding material.
  • the buffer layer can be more than two layers thick to enhance the flux pinning effect and the alignment of MgB2.
  • the flux pinning effect can be enhanced by forming point defects and columnar defects on the buffer layer. It is desirable that wires and films to be irradiated by heavy ions so that columnar defects are formed Mode for the Invention
  • MgB2 multifilamentary superconducting wire There are several methods for producing MgB2 multifilamentary superconducting wire. One will be discussed. MgB2 multifilamentary superconducting wire are started by making hole of the Nb-Ti superconductor rod in length direction. Then the Mg and B powders that have previously been mixed well and have a mole ratio of 1 :2 are poured into the rod through the hole. To make long wire, it is necessary to repeat the drawing and annealing processes. The wire is then cut into equal length and stacked. These are bundled together in the copper alloy metal shielding and drawing and annealing processes are repeated until the desired dimensions are achieved. Finally, they are heat treated at 600-950°C in an inert gas atmosphere. This is how the MgB2 multifilamentary superconducting wire using NbTi superconductor as a tube, shown in drawing 1 was produced.
  • NbTi superconducting plate handled properly for the substrate. Borons are deposited on the substrate by using any of established deposition processes which are mentioned above. Mg is deposited on the boron with mole ratio of 1 :2. Nb is deposited on the Mg and B in order to prevent a reaction between MgB2 and the copper based metal shielding . Finally a copper based metal shielding is deposited on the entire film. It is heat treated at 600-950°C in an inert gas atmosphere. This is how the MgB2 superconducting film using NbTi superconductor as a substrate, shown in drawing 10 was produced.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

L'invention concerne un supraconducteur Nb-Ti pratique à utiliser dont la température de transition de supraconduction d'environ 9K limite son utilisation uniquement à l'état d'hélium liquide. De ce fait, on ne peut l'utiliser largement. Toutefois, l'invention consiste associer la technologie bien connue du supraconducteur Nb-Ti à la technologie du supraconducteur MgB2 et concerne des fils et des films supraconducteurs. Dans le cas d'un fil de supraconduction, l'invention est caractérisée en ce que le supraconducteur Nb-Ti est utilisé comme tube et MgB2 est utilisé comme filament. Dans le cas d'un film de supraconduction, l'invention est caractérisée en ce que le supraconducteur Nb-Ti est utilisé comme substrat et MgB2 est déposé sur ledit substrat. En conséquence, l'utilisation du supraconducteur Nb-Ti déjà commercialisé comme tube et substrat offre les avantages de fils et de films possédant la supraconductivité de Nb-Ti+MgB2 inférieure à 9K qui est la température de transition de supraconduction de Nb-Ti et la supraconductivité de MgB2 comprise entre 9 et 39K.
PCT/KR2005/000488 2004-03-15 2005-02-24 Fils multifilaments supraconducteurs mgb2, films utilisant un supraconducteur nb-ti comme tube et substrat Ceased WO2005088651A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0017357 2004-03-15
KR1020040017357A KR20040052539A (ko) 2004-03-15 2004-03-15 니오비움·티탄계 초전도체를 튜우브로 이용한이붕소마그네슘 극세다심선

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WO2005088651A1 true WO2005088651A1 (fr) 2005-09-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017017715A1 (ja) * 2015-07-24 2018-03-15 株式会社日立製作所 超電導線、超電導コイル、ｍｒｉ及びｎｍｒ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115714045B (zh) * 2022-11-16 2025-08-12 福建师范大学 一种快速制备高致密度MgB2线材的设备及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020198111A1 (en) * 2001-03-09 2002-12-26 Tomsic Michael J. Method for manufacturing MgB2 intermetallic superconductor wires
US6569360B2 (en) * 2000-09-11 2003-05-27 Hengning Wu Method of preparing metal matrix composite with textured compound
US6586370B1 (en) * 1997-02-26 2003-07-01 Nove' Technologies, Inc. Metal boride based superconducting composite
US20030219911A1 (en) * 2002-03-25 2003-11-27 Xianghui Zeng Method for producing boride thin films
EP1467418A2 (fr) * 2003-04-11 2004-10-13 Hitachi, Ltd. Fil supraconducteur en MgB2 avec gaine composée et méthode de sa fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6586370B1 (en) * 1997-02-26 2003-07-01 Nove' Technologies, Inc. Metal boride based superconducting composite
US6569360B2 (en) * 2000-09-11 2003-05-27 Hengning Wu Method of preparing metal matrix composite with textured compound
US20020198111A1 (en) * 2001-03-09 2002-12-26 Tomsic Michael J. Method for manufacturing MgB2 intermetallic superconductor wires
US20030219911A1 (en) * 2002-03-25 2003-11-27 Xianghui Zeng Method for producing boride thin films
EP1467418A2 (fr) * 2003-04-11 2004-10-13 Hitachi, Ltd. Fil supraconducteur en MgB2 avec gaine composée et méthode de sa fabrication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017017715A1 (ja) * 2015-07-24 2018-03-15 株式会社日立製作所 超電導線、超電導コイル、ｍｒｉ及びｎｍｒ
EP3327733A4 (fr) * 2015-07-24 2019-03-06 Hitachi, Ltd. Fil supraconducteur, bobine supraconductrice, appareil d'irm et appareil de rmn
US11127514B2 (en) 2015-07-24 2021-09-21 Hitachi, Ltd. Superconducting wire, superconducting coil, MRI and NMR

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Publication number Publication date
KR20040052539A (ko) 2004-06-23
KR20060120279A (ko) 2006-11-24

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