WO2019182049A1 - Matériau de fil supraconducteur et matériau de fil supraconducteur isolé - Google Patents

Matériau de fil supraconducteur et matériau de fil supraconducteur isolé Download PDF

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Publication number
WO2019182049A1
WO2019182049A1 PCT/JP2019/011839 JP2019011839W WO2019182049A1 WO 2019182049 A1 WO2019182049 A1 WO 2019182049A1 JP 2019011839 W JP2019011839 W JP 2019011839W WO 2019182049 A1 WO2019182049 A1 WO 2019182049A1
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WIPO (PCT)
Prior art keywords
superconducting
wire
superconducting wire
channel
channel groove
Prior art date
Application number
PCT/JP2019/011839
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English (en)
Japanese (ja)
Inventor
桜井　英章
駒井　栄治
Original Assignee
三菱マテリアル株式会社
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Filing date
Publication date
Priority claimed from JP2019046015A external-priority patent/JP2019169468A/ja
Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Publication of WO2019182049A1 publication Critical patent/WO2019182049A1/fr

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    • 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
    • H01B12/10—Multi-filaments embedded in normal conductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the present invention relates to a superconducting wire and an insulating superconducting wire having a wire-in-channel structure.
  • an insulated superconducting wire in which the surface of the superconducting wire is covered with an insulating film is known.
  • This insulated superconducting wire is used as a superconducting cable and a superconducting coil.
  • Superconducting cables are used, for example, as power transmission lines.
  • Superconducting coils are used in fields such as a magnetic resonance imaging (MRI) device, a nuclear magnetic resonance (NMR) device, a particle accelerator, a linear motor car, and a power storage device.
  • a superconducting wire there is known a structure (wire-in-channel (WIC) structure) in which a superconducting core wire is accommodated and fixed in a channel groove of a channel (also referred to as a stabilizing material) having a channel groove.
  • WIC wire-in-channel
  • a superconducting core wire a superconducting multi-core wire (also referred to as a superconducting core material) comprising a metal base material and a plurality of superconducting filaments embedded in the metal base material is widely used.
  • Patent Document 1 discloses a superconducting wire having a WIC structure that is housed and fixed in a channel groove in a state where the periphery of the superconducting multi-core wire is covered with an electrical insulating layer.
  • This Patent Document 1 exemplifies a polymer-based insulator selected from the group consisting of polyvinyl acetal resin, polyethyleneimine, polyethylene terephthalate, glass fiber, polyester, and polyimide as a material for the electrical insulating layer.
  • a method of manufacturing a superconducting wire having a WIC structure a method is known in which a superconducting core wire is inserted into a channel groove of a channel and the channel groove and the superconducting core wire are fixed using solder.
  • the superconducting wire is inserted into the channel groove of the channel, the side wall of the channel groove is tightened so as to be pressed against the superconducting wire, and the upper end of the side wall of the channel groove
  • Patent Document 2 A method of caulking so as to cover the upper portion of the superconducting wire is known (Patent Document 2).
  • the superconducting core wires of the superconducting wire need to be electrically connected and insulated so as not to be short-circuited.
  • a braiding method As a method of forming a superconducting wire with an insulating film, a braiding method, a coating method, and an electrodeposition method are known.
  • the braiding method is a method in which a braided string made of a plurality of fibers is knitted around a superconducting wire and insulated.
  • the coating method is a method in which a varnish containing a resin for forming an insulating film and a solvent is applied to the surface of the superconducting wire to form a coating layer, and then the coating layer is heated and the generated insulating film is baked onto the superconducting wire. It is.
  • the electrodeposition method is performed by immersing a superconducting wire and an electrode in an electrodeposition liquid in which charged insulating resin particles are dispersed, and applying a DC voltage between the superconducting wire and the electrode to obtain a surface of the superconducting wire. Insulating resin particles are electrodeposited to form an electrodeposited layer, then the electrodeposited layer is heated, and the resulting insulating film is baked onto the superconducting wire.
  • the braiding method requires a facility for producing a braided string, which increases the cost of the facility.
  • the coating method or the electrodeposition method is applied to a superconducting wire having a WIC structure
  • the superconducting wire moves in the channel groove, and the superconducting multicore wire and the channel
  • a gap might occur between them.
  • a superconducting wire with a WIC structure when the superconducting state of the superconducting multicore wire is partially broken and transitions to the normal conducting state, a large amount of heat is generated in the superconducting multicore wire, and the generated heat is transferred to the channel.
  • the gap between the superconducting multi-core wire and the channel is small and the thermal conductivity is high.
  • the superconducting multi-core wire is covered with an electrical insulating layer, if the insulating film is heated to be baked on the superconducting wire, a gap is generated between the superconducting multi-core wire and the channel, and the thermal conductivity is reduced. There was a tendency for damage to occur.
  • the present invention has been made in view of the above-described circumstances, and its purpose is to provide a structure between a superconducting core wire and a channel when heated even though the superconducting core wire is covered with an electrical insulating layer. It is an object of the present invention to provide a superconducting wire and an insulating superconducting wire having a WIC structure in which gaps are unlikely to occur and high superconductivity can be maintained over a long period of time.
  • a superconducting wire according to an aspect of the present invention includes a channel including a channel groove having an opening, and the channel groove of the channel.
  • a superconducting wire comprising a superconducting core wire housed and fixed in the core, wherein the superconducting core wire is covered with an electrically insulating layer, and the width of the opening of the channel groove is larger than the diameter of the superconducting core wire. It is characterized by being set narrowly.
  • the channel groove is set so that the width of the opening is narrower than the diameter of the superconducting core wire, and the superconducting core material and the electrical insulating layer are in strong contact with each other. Difficult to move in the groove.
  • the superconducting wire of the present invention has a configuration in which the superconducting core wire is covered with an electrically insulating layer, but when heated, it becomes difficult for a gap to be generated between the superconducting core wire and the channel, and for a long period of time. High superconductivity can be maintained.
  • the opening of the channel groove may be closed.
  • the superconducting core material and the electrical insulation layer are in greater contact, the superconducting core wire is less likely to move within the channel groove, and more gaps are generated between the superconducting core wire and the channel when heated. It becomes difficult.
  • the superconducting core wire is a superconducting multi-core wire comprising a metal base material and a plurality of superconducting filaments embedded in the metal base material.
  • the superconducting core wire is a superconducting multi-core wire composed of a metal base material and a plurality of superconducting filaments embedded in the metal base material, and has high superconductivity. Sex can be maintained.
  • An insulated superconducting wire according to an aspect of the present invention includes the above-described superconducting wire and an insulating film covering at least a part of the superconducting wire. Yes.
  • the insulated superconducting wire of the present invention since the superconducting wire is the above-described superconducting wire, the superconducting core wire hardly moves in the channel groove. For this reason, the insulated superconducting wire of the present invention is less likely to generate a gap between the superconducting core wire and the channel, and can maintain high superconductivity over a long period of time.
  • the surface of the channel may be covered with the insulating film, and the surface of the electrical insulating layer may not be covered with the insulating film.
  • the amount of the insulating film used can be reduced by the amount that the surface of the electrical insulating layer is not covered with the insulating film while maintaining sufficient insulation, and the overall weight of the insulating superconducting wire can be reduced.
  • a superconducting core wire is covered with an electrical insulating layer, but when heated, a gap is hardly generated between the superconducting core wire and the channel, and high superconductivity is maintained over a long period of time. It is possible to provide a superconducting wire having a WIC structure and an insulating superconducting wire that can be used.
  • FIG. 1 is a cross-sectional view of a superconducting wire according to the first embodiment of the present invention.
  • the superconducting wire 11 according to the first embodiment includes a channel 20 having a channel groove 21 and a superconducting core wire 35 accommodated and fixed in the channel groove 21.
  • the cross-sectional shape of the superconducting wire 11 is a substantially quadrangular shape with curvature at the corners.
  • the superconducting core wire 35 is a superconducting multi-core wire 30 composed of a metal base material 31 and a plurality of superconducting filaments 32 embedded in the metal base material 31.
  • the superconducting multi-core wire 30 is covered with an electrical insulating layer 33.
  • the cross-sectional shape of the superconducting multi-core wire 30 is circular, but the cross-sectional shape of the superconducting multi-core wire 30 is not particularly limited, and for example, a rectangular with a curved corner. It may be a shape.
  • the channel groove 21 is set so that the width W of the opening 22 is narrower than the diameter ⁇ of the superconducting multicore wire 30.
  • the width W of the opening 22 is a distance of a portion where the interval between the groove side surfaces is the narrowest in the cross section of the channel groove 21.
  • the superconducting wire moves in the channel groove when heated to bake the insulating film on the superconducting wire. Thus, a gap may be generated between the superconducting multi-core wire and the channel.
  • the width W of the opening 22 of the channel groove 21 is narrower than the diameter ⁇ of the superconducting multicore wire 30 so that the superconducting multicore wire 30 does not move in the channel groove 21. It is set as follows.
  • the width W of the opening 22 of the channel groove 21 preferably satisfies the following formula (1). ( ⁇ -50 ⁇ m) ⁇ W ⁇ (1)
  • ⁇ is the diameter of the superconducting multicore wire 30 and is generally in the range of 500 ⁇ m to 1500 ⁇ m.
  • the channel groove 21 has a protrusion 23 formed on the inner wall, and the width W of the opening 22 is set to be narrower than the diameter ⁇ of the superconducting multi-core wire 30 by the protrusion 23.
  • the protrusion 23 is preferably in contact with the electrical insulating layer 33 covering the superconducting multicore wire 30. When the protruding portion 23 is in contact with the electrical insulating layer 33, the superconducting multi-core wire 30 is less likely to move in the channel groove 21.
  • the material of the channel 20 for example, copper, copper alloy, aluminum, or aluminum alloy can be used.
  • the metal base material 31 of the superconducting multicore wire 30 for example, copper, copper alloy, aluminum, or aluminum alloy can be used.
  • the superconducting filament 32 of the superconducting multicore wire 30 for example, NbTi alloy or Nb 3 Sn can be used.
  • the material for the electrical insulating layer 33 include insulating resins such as polyvinyl acetal resin, polyethyleneimine resin, polyethylene terephthalate resin, glass fiber, polyester resin, formalized polyvinyl alcohol resin, polyvinyl alcohol resin, polyamideimide resin, and polyimide resin. Can be used. One of these insulating resins may be used alone, or two or more thereof may be used in combination.
  • the thickness of the electrical insulating layer 33 is, for example, in the range of 5 ⁇ m to 60 ⁇ m.
  • FIGS. 2A and 2B are cross-sectional views illustrating an example of a method for manufacturing a superconducting wire according to the first embodiment.
  • the width of the opening 42 of the channel groove 41 is set wider than the diameter of the superconducting multicore wire 30.
  • the superconducting multi-core wire 30 is accommodated in the channel groove 41 of the channel 40.
  • the channel 40 is pressurized in the direction of the arrow from the side surface to form a protrusion 43 on the inner wall of the opening 42 of the channel groove 41.
  • the width of the opening 42 of the channel groove 41 is made smaller than the diameter of the superconducting multicore wire 30.
  • FIGS. 3A and 3B are cross-sectional views showing another example of the method for manufacturing a superconducting wire according to the first embodiment.
  • the channel 20 in which the width of the opening 22 of the channel groove 21 is set narrower than the diameter of the superconducting multicore wire 30 is formed.
  • both ends of the upper surface of the channel 20 are pressed in the direction of the arrow, and are bent so that the width of the opening 22 of the channel groove 21 is wider than the diameter of the superconducting multicore wire 30.
  • the superconducting multi-core wire 30 is accommodated in the channel groove 21. Then, both ends of the lower surface of the channel 20 are pressurized in the direction of the arrow to return the channel 20 to its original shape.
  • a method of manufacturing the superconducting wire a method of press-fitting the superconducting multi-core wire 30 into the channel groove 21 can be used.
  • the opening 22 of the channel groove 21 is open, but the opening 22 may be closed.
  • An example of a superconducting wire having an opening 22 in the channel groove 21 is shown in FIG. In FIG. 4, portions common to the superconducting wire 11 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
  • the protrusions 23 protrude from both sides of the inner wall of the channel groove 21 so as to come into contact with each other, whereby the opening 22 of the channel groove 21 is closed. .
  • the contact area between the inner wall of the channel groove 21 and the superconducting wire 11 is increased, the superconducting multi-core wire 30 and the channel groove 21 are more strongly in contact with each other through the electrical insulating layer 33. For this reason, the superconducting multi-core wire 30 is less likely to move in the channel groove 21.
  • FIG. 5 is a cross-sectional view of an insulated superconducting wire according to the third embodiment of the present invention.
  • the insulated superconducting wire 13 shown in FIG. 5 includes a superconducting wire 11 and an insulating film 60 that covers the superconducting wire 11. Since the superconducting wire 11 is the same as the superconducting wire 11 of the first embodiment described above, the same reference numerals are given and detailed description is omitted.
  • the insulating film 60 preferably has a thickness in the range of 5 ⁇ m to 60 ⁇ m.
  • a material of the insulating film 60 for example, it is generally used as a material of an insulating film of an insulating superconducting wire such as formalized polyvinyl alcohol resin, polyvinyl alcohol resin, polyamideimide resin, polyimide resin, polyesterimide resin, polyester resin, polyurethane resin, etc. Can be used.
  • the insulating film 60 covers the entire surface of the superconducting wire 11.
  • the insulated superconducting wire 13 having such a configuration can be manufactured by a coating method. That is, the insulating superconducting wire 13 is formed by applying a varnish containing a resin for forming an insulating film and a solvent to the surface of the superconducting wire 11 to form a coating layer, and then heating the coating layer to form the generated insulating coating.
  • the superconducting wire 11 can be manufactured by a method of baking. As a method of applying the varnish to the surface of the superconducting wire 11, a dipping method in which the superconducting wire 11 is immersed in the varnish can be used.
  • FIG. 6 is a cross-sectional view of an insulated superconducting wire according to the fourth embodiment of the present invention.
  • the surface of the channel 20 is covered with an insulating film 60, and the electrically insulating layer 33 covering the superconducting multicore wire 30 is not covered with the insulating film 60. It differs from the insulated superconducting wire 13 of the third embodiment. Since the other points are the same as those of the insulated superconducting wire 13 of the third embodiment, the same reference numerals are given and detailed description is omitted.
  • the usage amount of the insulating film 60 can be reduced by the amount that the surface of the electrical insulating layer 33 is not covered with the insulating film 60, and the insulated superconducting wire as a whole. 14 can be reduced in weight.
  • the insulated superconducting wire 14 of the fourth embodiment can be manufactured by an electrodeposition method. That is, the insulating superconducting wire 14 is obtained by immersing the superconducting wire 11 and the electrode in an electrodeposition liquid in which charged insulating resin particles are dispersed, and applying a DC voltage between the superconducting wire 11 and the electrode. In this method, the insulating resin particles are electrodeposited on the surface of the superconducting wire 11 to form an electrodeposited layer, and then the electrodeposited layer is heated to burn the generated insulating film onto the superconducting wire 11. In the electrodeposition method, since the insulating resin particles are not electrodeposited on the surface of the superconducting multi-core wire 30 covered with the electrical insulating layer 33, only the surface of the channel 20 is covered with the insulating film 60.
  • the channel groove 21 has a width W of the opening 22 from the diameter ⁇ of the superconducting multicore wire 30. Since the superconducting multicore wire 30 is covered with the electrical insulating layer 33, the superconducting multicore wire 30 hardly moves in the channel groove 21 when heated. For this reason, the superconducting wire 11 of the first embodiment and the superconducting wire 12 of the second embodiment are less likely to generate a gap between the superconducting multicore wire 30 and the channel 20 and maintain high superconductivity over a long period of time. be able to.
  • the superconducting multi-core wire 30 and the electrical insulating layer 33 are more strongly in contact with each other. For this reason, the superconducting multicore wire 30 is less likely to move in the channel groove 21, and a gap is less likely to be generated between the superconducting multicore wire 30 and the channel 20 when heated.
  • the superconducting wire 11 of the first embodiment and the superconducting wire 12 of the second embodiment use the superconducting multi-core wire 30 as the superconducting core wire 35, higher superconductivity can be maintained over a long period of time. .
  • the superconducting multicore wire 30 is a channel groove 21. Difficult to move in. For this reason, the insulated superconducting wire 13 of the third embodiment and the insulated superconducting wire 14 of the fourth embodiment are less likely to generate a gap between the superconducting multi-core wire 30 and the channel 20, and have high superconductivity over a long period of time. Can be maintained.
  • the superconducting multi-core wire 30 is used as the superconducting core wire 35, but the present invention is not limited to this case.
  • a single metal wire may be used as the superconducting core wire 35.
  • the superconducting wire 11 of the first embodiment in which the opening 22 of the channel groove 21 is opened is used. You may use the superconducting wire 12 of 2nd embodiment by which the part 22 is obstruct
  • a WIC structure that has a configuration in which a superconducting core wire is covered with an electrical insulating layer, but hardly generates a gap between the superconducting core wire and a channel when heated, and can maintain high superconductivity over a long period of time. It is possible to provide a superconducting wire and an insulating superconducting wire.

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  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

La présente invention porte sur un matériau de fil supraconducteur comprenant : un canal doté d'une rainure de canal comportant une ouverture ; et un matériau de fil de noyau supraconducteur qui est reçu et fixé dans la rainure de canal du canal. Le matériau de fil supraconducteur est caractérisé en ce que : le matériau de fil de noyau supraconducteur est recouvert d'une couche d'isolation électrique ; et la largeur de l'ouverture de la rainure de canal est réglée de façon à être plus étroite que le diamètre du matériau de fil de noyau supraconducteur.
PCT/JP2019/011839 2018-03-22 2019-03-20 Matériau de fil supraconducteur et matériau de fil supraconducteur isolé WO2019182049A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2018-054691 2018-03-22
JP2018054691 2018-03-22
JP2019046015A JP2019169468A (ja) 2018-03-22 2019-03-13 超電導線材および絶縁超電導線材
JP2019-046015 2019-03-13

Publications (1)

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WO2019182049A1 true WO2019182049A1 (fr) 2019-09-26

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PCT/JP2019/011839 WO2019182049A1 (fr) 2018-03-22 2019-03-20 Matériau de fil supraconducteur et matériau de fil supraconducteur isolé

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09134625A (ja) * 1996-11-18 1997-05-20 Mitsubishi Cable Ind Ltd 絶縁超電導線の製造方法
JP2000294053A (ja) * 1999-04-12 2000-10-20 Kobe Steel Ltd 安定化複合超電導線材およびその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09134625A (ja) * 1996-11-18 1997-05-20 Mitsubishi Cable Ind Ltd 絶縁超電導線の製造方法
JP2000294053A (ja) * 1999-04-12 2000-10-20 Kobe Steel Ltd 安定化複合超電導線材およびその製造方法

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