WO2024075481A1 - Structure de connexion de matériau de fil supraconducteur, et structure stratifiée - Google Patents

Structure de connexion de matériau de fil supraconducteur, et structure stratifiée Download PDF

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Publication number
WO2024075481A1
WO2024075481A1 PCT/JP2023/033294 JP2023033294W WO2024075481A1 WO 2024075481 A1 WO2024075481 A1 WO 2024075481A1 JP 2023033294 W JP2023033294 W JP 2023033294W WO 2024075481 A1 WO2024075481 A1 WO 2024075481A1
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superconducting wire
superconducting
layer
face
connection structure
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PCT/JP2023/033294
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English (en)
Japanese (ja)
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智寛 伊東
康太郎 大木
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住友電気工業株式会社
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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
    • H01B12/06—Films or wires on bases or cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/68—Connections to or between superconductive connectors

Definitions

  • Patent Document 1 Japanese Patent Application Laid-Open No. 2013-235699
  • Patent Document 1 describes a superconducting wire connection structure.
  • the superconducting wire connection structure described in Patent Document 1 has a first superconducting wire, a second superconducting wire, a third superconducting wire, and a superconducting bonding layer.
  • the first superconducting wire has a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer.
  • the second superconducting wire has a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the third superconducting wire has a third substrate, a third intermediate layer disposed on the third substrate, and a third superconducting layer disposed on the third intermediate layer.
  • the first superconducting wire has a first end face in the longitudinal direction of the first superconducting wire.
  • the first superconducting wire has a first end portion adjacent to the first end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end portion adjacent to the second end face in the longitudinal direction of the second superconducting wire.
  • the first superconducting wire and the second superconducting wire are arranged so that the first end face and the second end face face each other. In this state, the first substrate, the first intermediate layer, and the first superconducting layer face the second substrate, the second intermediate layer, and the second superconducting layer, respectively.
  • the third superconducting wire is arranged so that the third superconducting layer faces the first superconducting layer at the first end and the second superconducting layer at the second end, with a superconducting bonding layer interposed between them.
  • the third superconducting layer is superconductively bonded to the first superconducting layer at the first end and the second superconducting layer at the second end by the superconducting bonding layer.
  • the superconducting wire connection structure disclosed herein comprises a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire. The first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively.
  • FIG. 1 is a plan view of a superconducting wire connection structure 100.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a plan view of the superconducting wire connection structure 100 in which the third superconducting wire 30 and the connection layer 40 are not shown.
  • FIG. 4 is a manufacturing process diagram of the superconducting wire connection structure 100.
  • FIG. 5 is a plan view of the superconducting wire connection structure 200.
  • FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.
  • FIG. 7 is a plan view of superconducting wire connection structure 200 in which third superconducting wire 30 and connection layer 40 are not shown.
  • FIG. 1 is a plan view of a superconducting wire connection structure 100.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG.
  • FIG. 3 is a plan view of the superconducting wire connection structure 100 in which the third supercon
  • FIG. 8 is a schematic side view of the laminated structure 300.
  • FIG. 9 is a plan view of a superconducting wire connection structure 100 according to Modification 1 in which the third superconducting wire 30 and the connection layer 40 are omitted.
  • FIG. 10 is a plan view of a superconducting wire connection structure 100 according to Modification 2 in which the third superconducting wire 30 and the connection layer 40 are omitted.
  • FIG. 11 is a plan view of a superconducting wire connection structure 100 according to Modification 3 in which the third superconducting wire 30 and the connection layer 40 are not shown.
  • FIG. 12 is a plan view of a superconducting wire connection structure 100 according to Modification 4 in which the third superconducting wire 30 and the connection layer 40 are not shown.
  • FIG. 9 is a plan view of a superconducting wire connection structure 100 according to Modification 1 in which the third superconducting wire 30 and the connection layer 40 are omitted.
  • FIG. 10 is a plan view
  • FIG. 13 is a plan view of the superconducting wire connection structure 100A.
  • FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG.
  • FIG. 15 is a cross-sectional view taken along line XV-XV in FIG.
  • FIG. 16 is a manufacturing process diagram of the superconducting wire connection structure 100A.
  • connection part increases.
  • This disclosure has been made in consideration of the problems with the conventional technology described above. More specifically, this disclosure provides a superconducting wire connection structure that can reduce the thickness of the connection while ensuring strength against tensile loads.
  • the superconducting wire connection structure includes a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire.
  • the first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively.
  • the superconducting wire connection structure of (1) above it is possible to thin the connection portion while ensuring strength against tensile load.
  • a recess may be provided on the first end face.
  • a protrusion may be provided on the second end face.
  • the first superconducting wire may be connected to the second superconducting wire by engaging the recess and the protrusion with each other.
  • it is possible to make the interface distance between the first end face and the second end face larger than the width of the wire by providing a recess and a protrusion on the first end face and the second end face, respectively.
  • the recesses and protrusions may be composed only of curves in a plan view.
  • the superconducting wire connection structure of (3) above makes it possible to suppress stress concentration when a tensile load is applied.
  • the first end face may be provided with a plurality of first recesses and a plurality of first protrusions.
  • the second end face may be provided with a plurality of second recesses and a plurality of second protrusions.
  • the first recess may be between two adjacent first protrusions in the width direction of the first superconducting wire.
  • the second recess may be between two adjacent second protrusions in the width direction of the second superconducting wire.
  • the first superconducting wire may be connected to the second superconducting wire by the first recess and the second protrusion engaging with each other and the first protrusion and the second recess engaging with each other.
  • the concentration of the tensile load at one point is suppressed, and the interface distance between the first end face and the second end face is larger than the width of the wire, so that the strength against the tensile load can be increased.
  • the first recess, the first protrusion, the second recess, and the second protrusion may be composed only of curves in a plan view. According to the superconducting wire connection structure of (5) above, it is possible to suppress stress concentration when a tensile load is applied.
  • the first end face may have a portion that is inclined with respect to the width direction of the first superconducting wire in a plan view.
  • the second end face may have a portion that is inclined with respect to the width direction of the second superconducting wire in a plan view. According to the superconducting wire connection structure of (6) above, the engagement between the first end face and the second end face can be made more firmly.
  • the superconducting wire connection structure of (1) to (6) above may further include a third superconducting wire and a connection layer.
  • the first superconducting wire may be an end of the first superconducting wire in the longitudinal direction and may have a first end adjacent to the first end face.
  • the second superconducting wire may be an end of the second superconducting wire in the longitudinal direction and may have a second end adjacent to the second end face.
  • the third superconducting wire may have a third substrate, a third intermediate layer disposed on the third substrate, and a third superconducting layer disposed on the third intermediate layer.
  • the third superconducting layer may be superconductively joined to the first superconducting layer at the first end and the second superconducting layer at the second end via a connection layer. According to the superconducting wire connection structure of (6) above, it is possible to pass a large current from the first superconducting layer to the second superconducting layer via the third superconducting layer.
  • the first intermediate layer and the first superconducting layer at both ends of the first end in the width direction of the first superconducting wire may be removed.
  • the second intermediate layer and the second superconducting layer at both ends of the second end in the width direction of the second superconducting wire may be removed.
  • the third intermediate layer and the third superconducting layer at both ends in the width direction of the third superconducting wire may be removed.
  • Both ends of the third substrate in the width direction of the third superconducting wire may be welded to the first substrate at both ends of the first end in the width direction of the first superconducting wire, and may be welded to the second substrate at both ends of the second end in the width direction of the second superconducting wire.
  • the laminated structure according to the embodiment includes a plurality of superconducting wire connection structures.
  • the superconducting wire connection structure includes a first superconducting wire having a first substrate, a first intermediate layer disposed on the first substrate, and a first superconducting layer disposed on the first intermediate layer, and a second superconducting wire having a second substrate, a second intermediate layer disposed on the second substrate, and a second superconducting layer disposed on the second intermediate layer.
  • the first superconducting wire has a first end face which is an end face in the longitudinal direction of the first superconducting wire.
  • the second superconducting wire has a second end face which is an end face in the longitudinal direction of the second superconducting wire.
  • the first end face and the second end face of the first superconducting wire are engaged with each other, so that the first substrate, the first intermediate layer, and the first superconducting layer face each other, respectively.
  • the plurality of superconducting wire connection structures are arranged in a stacked manner.
  • the superconducting wire connection structure according to the first embodiment is referred to as a superconducting wire connection structure 100.
  • the superconducting wire connection structure 100 has a first superconducting wire 10, a second superconducting wire 20, a third superconducting wire 30, and a connection layer 40.
  • the first superconducting wire 10 has a first substrate 11, a first intermediate layer 12, and a first superconducting layer 13.
  • the first substrate 11 is, for example, a clad material having a tape member made of stainless steel, a copper (Cu) layer disposed on the tape member, and a nickel (Ni) layer disposed on the copper layer.
  • the first substrate 11 may be, for example, a tape member made of Hastelloy (registered trademark).
  • the first intermediate layer 12 is disposed on the first substrate 11.
  • the first intermediate layer 12 is disposed on the nickel layer of the first substrate 11.
  • the first intermediate layer 12 has, for example, an yttria (Y 2 O 3 ) layer, an yttria-stabilized zirconia (YSZ) layer disposed on the yttria layer, and a cerium oxide (CeO 2 ) layer disposed on the yttria-stabilized zirconia layer.
  • the first superconducting layer 13 is disposed on the first intermediate layer 12.
  • the constituent material of the first superconducting layer 13 is an oxide superconductor.
  • the oxide superconductor is, for example, REBCO.
  • REBCO is REBa 2 Cu 3 O 7-y (RE is a rare earth element).
  • RE is a rare earth element.
  • a specific example of the rare earth element is gadolinium, but is not limited to this.
  • the second superconducting wire 20 has a second substrate 21, a second intermediate layer 22, and a second superconducting layer 23.
  • the second substrate 21 is, for example, a clad material having a tape member made of stainless steel, a copper layer disposed on the tape member, and a nickel layer disposed on the copper layer.
  • the second substrate 21 may be, for example, a tape member made of Hastelloy.
  • the second intermediate layer 22 is disposed on the second substrate 21.
  • the second intermediate layer 22 is disposed on the nickel layer of the second substrate 21.
  • the second intermediate layer 22 has, for example, an yttria layer, an yttria-stabilized zirconia layer disposed on the yttria layer, and a cerium oxide layer disposed on the yttria-stabilized zirconia layer.
  • the second superconducting layer 23 is disposed on the second intermediate layer 22.
  • the constituent material of the second superconducting layer 23 is an oxide superconductor.
  • the oxide superconductor is, for example, REBCO.
  • the first superconducting wire 10 has a first end face 10a in the longitudinal direction of the first superconducting wire 10.
  • the first superconducting wire 10 has a first end face 10b in the longitudinal direction of the first superconducting wire 10.
  • the first end face 10b is adjacent to the first end face 10a.
  • the second superconducting wire 20 has a second end face 20a in the longitudinal direction of the second superconducting wire 20.
  • the second superconducting wire 20 has a second end face 20b in the longitudinal direction of the second superconducting wire 20.
  • the second end face 20b is adjacent to the second end face 20a.
  • the longitudinal direction of the first superconducting wire 10 and the longitudinal direction of the second superconducting wire 20 are aligned along the first direction DR1.
  • the second direction DR2 is perpendicular to the first direction DR1.
  • the width direction of the first superconducting wire 10 and the width direction of the second superconducting wire 20 are aligned along the second direction DR2.
  • the first superconducting wire 10 is connected to the second superconducting wire 20 by engaging the first end face 10a with the second end face 20a.
  • the first end face 10a being engaged with the second end face 20a means that the first end face 10a and the second end face 20a are kept in contact with each other against a load along the first direction DR1, so that the relative position of the first superconducting wire 10 in the first direction DR1 with respect to the second superconducting wire 20 does not change.
  • the first substrate 11, the first intermediate layer 12, and the first superconducting layer 13 face the second substrate 21, the second intermediate layer 22, and the second superconducting layer 23, respectively.
  • the first end face 10a has a plurality of first recesses 10c.
  • the first recesses 10c penetrate the first superconducting wire 10 along the thickness direction. More specifically, the first recesses 10c penetrate the first substrate 11, the first intermediate layer 12, and the first superconducting layer 13.
  • the first recesses 10c are arranged at intervals in the second direction DR2.
  • the width of the first recesses 10c in the second direction DR2 becomes smaller as it approaches the first end face 10a.
  • the portion of the first superconducting wire 10 between two adjacent first recesses 10c becomes the first convex portion 10d. Therefore, the width of the first convex portion 10d in the second direction DR2 becomes larger as it approaches the first end face 10a.
  • the width of the first recess 10c in the second direction DR2 is maximum at the bottom side of the first recess 10c (see width W11 in FIG. 3) and minimum at the opening side of the first recess 10c (see width W12 in FIG. 3), and the width of the first convex portion 10d in the second direction DR2 is maximum at the tip side of the first convex portion 10d (see width W21 in FIG. 3) and minimum at the base side of the first convex portion 10d (see width W22 in FIG. 3).
  • the second end face 20a has a plurality of second recesses 20c.
  • the second recesses 20c penetrate the second superconducting wire 20 along the thickness direction. More specifically, the second recesses 20c penetrate the second substrate 21, the second intermediate layer 22, and the second superconducting layer 23.
  • the second recesses 20c are arranged at intervals in the second direction DR2.
  • the width of the second recesses 20c in the second direction DR2 decreases as it approaches the second end face 20a.
  • the portion of the second superconducting wire 20 between two adjacent second recesses 20c becomes the second convex portion 20d. Therefore, the width of the second convex portion 20d in the second direction DR2 increases as it approaches the second end face 20a.
  • the width of the second recess 20c in the second direction DR2 is maximum at the bottom side of the second recess 20c (see width W31 in FIG. 3) and minimum at the opening side of the second recess 20c (see width W32 in FIG. 3), and the width of the second convex portion 20d in the second direction DR2 is maximum at the tip side of the second convex portion 20d (see width W41 in FIG. 3) and minimum at the base side of the second convex portion 20d (see width W42 in FIG. 3).
  • the first convex portion 10d engages with the second concave portion 20c.
  • the second convex portion 20d engages with the first concave portion 10c.
  • the first end face 10a and the second end face 20a engage with each other, and the first superconducting wire 10 is connected to the second superconducting wire 20.
  • the width of the first recess 10c in the second direction DR2 decreases as it moves away from the bottom of the first recess 10c, and the width of the second protrusion 20d in the second direction DR2 increases as it moves closer to the tip of the second protrusion 20d. Therefore, even if a tensile load along the first direction DR1 is applied to the superconducting wire connection structure 100, the second protrusion 20d does not come out of the first recess 10c.
  • the width of the first protrusion 10d in the second direction DR2 increases as it moves closer to the tip of the first protrusion 10d, and the width of the second recess 20c in the second direction DR2 decreases as it moves away from the bottom of the second recess 20c. Therefore, even if a tensile load along the first direction DR1 is applied to the superconducting wire connection structure 100, the first protrusion 10d does not come out of the second recess 20c.
  • the shape of the first recess 10c and the shape of the first protrusion 10d in plan view are preferably made up of curves only.
  • the shape of the second recess 20c and the shape of the second protrusion 20d in plan view are preferably made up of curves only.
  • the third superconducting wire 30 has a third substrate 31, a third intermediate layer 32, and a third superconducting layer 33.
  • the third substrate 31 is, for example, a clad material having a tape member made of stainless steel, a copper layer disposed on the tape member, and a nickel layer disposed on the copper layer.
  • the third substrate 31 may be, for example, a tape member made of Hastelloy.
  • the third intermediate layer 32 is disposed on the third substrate 31.
  • the third intermediate layer 32 is disposed on the nickel layer of the third substrate 31.
  • the third intermediate layer 32 has, for example, an yttria layer, an yttria-stabilized zirconia layer disposed on the yttria layer, and a cerium oxide layer disposed on the yttria-stabilized zirconia layer.
  • the third superconducting layer 33 is disposed on the third intermediate layer 32.
  • the constituent material of the third superconducting layer 33 is an oxide superconductor.
  • the oxide superconductor is, for example, REBCO.
  • the third superconducting wire 30 is arranged so that the third superconducting layer 33 faces the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b, with the connecting layer 40 interposed therebetween.
  • connection layer 40 The material of the connection layer 40 is REBCO.
  • the REBCO crystals constituting the connection layer 40 are epitaxially grown from the REBCO crystals constituting the first superconducting layer 13 at the first end 10b, and also from the REBCO crystals constituting the second superconducting layer 23 at the second end 20b.
  • the REBCO crystals constituting the connection layer 40 are epitaxially grown from the REBCO crystals constituting the third superconducting layer 33. Therefore, the third superconducting layer 33 is superconductively joined to the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b by the connection layer 40.
  • the first superconducting wire 10 may further have a first stabilization layer 14.
  • the first stabilization layer 14 is disposed on the first superconducting layer 13.
  • the first superconducting wire 10 may have a first protective layer (not shown) disposed on the first stabilization layer 14.
  • the first superconducting wire 10 may not have a first protective layer.
  • the first stabilization layer 14 and the first protective layer are removed on the first superconducting layer 13 at the first end 10b.
  • the material of the first stabilization layer 14 is, for example, copper or a copper alloy.
  • the material of the first protective layer is, for example, silver or a silver alloy.
  • the second superconducting wire 20 may further have a second stabilizing layer 24.
  • the second stabilizing layer 24 is disposed on the second superconducting layer 23.
  • the second superconducting wire 20 may have a second protective layer (not shown) disposed on the second stabilizing layer 24.
  • the second superconducting wire 20 may not have a second protective layer.
  • the second stabilizing layer 24 and the second protective layer are removed on the second superconducting layer 23 at the second end 20b.
  • the second stabilizing layer 24 is made of, for example, copper or a copper alloy.
  • the second protective layer is made of, for example, silver or a silver alloy.
  • the method for manufacturing the superconducting wire connection structure 100 includes a preparation step S1, an end face processing step S2, a microcrystalline layer formation step S3, an end face engagement step S4, a superconducting joining step S5, and an oxygen reintroduction step S6.
  • the preparation step S1 the first superconducting wire 10, the second superconducting wire 20, and the third superconducting wire 30 are prepared. After the preparation step S1, the end face processing step S2 and the microcrystalline layer forming step S3 are performed.
  • a first recess 10c and a first protrusion 10d are formed on the first end face 10a.
  • the first recess 10c and the first protrusion 10d are formed by irradiating a laser near the first end face 10a to partially remove the first superconducting wire 10.
  • a second recess 20c and a second protrusion 20d are formed on the second end face 20a.
  • the second recess 20c and the second protrusion 20d are formed by the same method as the first recess 10c and the first protrusion 10d.
  • a microcrystalline layer 50 (not shown) is formed on the third superconducting layer 33.
  • an organic compound film is formed on the third superconducting layer 33 by, for example, spin coating.
  • the organic compound film contains the constituent elements of REBCO.
  • the organic compound film is pre-fired. By pre-fired, the organic compound film becomes a precursor of REBCO.
  • the organic compound film that has been pre-fired is called a pre-fired film.
  • the pre-fired film is heat-treated. As a result, the carbides contained in the pre-fired film are decomposed, and a microcrystalline layer 50 containing microcrystals of REBCO is formed.
  • the end face engagement step S4 is performed.
  • the first superconducting wire 10 is connected to the second superconducting wire 20 by engaging the first end face 10a with the second end face 20a.
  • the engagement between the first end face 10a and the second end face 20a is performed by sliding the first superconducting wire 10 along the thickness direction of the second superconducting wire 20 with the first recess 10c overlapping the second protrusion 20d and the first protrusion 10d overlapping the second recess 20c in a plan view.
  • the superconducting joining process S5 is performed.
  • the third superconducting layer 33 is superconductively joined to the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b by the connection layer 40.
  • the third superconducting wire 30 is arranged so that the third superconducting layer 33 faces the first superconducting layer 13 at the first end 10b and the second superconducting layer 23 at the second end 20b with the microcrystalline layer 50 interposed therebetween.
  • the first superconducting layer 13 at the first end 10b, the second superconducting layer 23 at the second end 20b, the third superconducting layer 33, and the microcrystalline layer 50 are heated and pressurized.
  • the REBCO microcrystals contained in the microcrystalline layer 50 are oriented and crystallized (epitaxially grown from the first superconducting layer 13 at the first end 10b, and the second superconducting layer 23 and the third superconducting layer 33 at the second end 20b) to become the connection layer 40.
  • the superconducting wire connection structure 100 having the structure shown in Figures 1 to 3 is formed.
  • the heating performed in the superconducting joining step S5 causes oxygen to be desorbed from the REBCO constituting the first superconducting layer 13 at the first end 10b, the REBCO constituting the second superconducting layer 23 at the second end 20b, the REBCO constituting the third superconducting layer 33, and the REBCO constituting the connection layer 40.
  • the superconducting wire connection structure 100 is heated and held in an oxygen-containing atmosphere, so that oxygen is reintroduced into the REBCO constituting the first superconducting layer 13 at the first end 10b, the REBCO constituting the second superconducting layer 23 at the second end 20b, the REBCO constituting the third superconducting layer 33, and the REBCO constituting the connection layer 40.
  • ⁇ Effects of superconducting wire connection structure 100> The effects of the superconducting wire connection structure 100 will be described below in comparison with a superconducting wire connection structure according to a comparative example.
  • the superconducting wire connection structure according to the comparative example is referred to as a superconducting wire connection structure 200.
  • the configuration of the superconducting wire connection structure 200 is the same as the configuration of the superconducting wire connection structure 100, except that the first end face 10a is not engaged with the second end face 20a, but is merely in contact with the second end face 20a.
  • the first end face 10a and the second end face 20a are not engaged, and therefore the first superconducting wire 10 and the second superconducting wire 20 are connected only via the connection layer 40. Therefore, reinforcement is required to ensure the strength of the superconducting wire connection structure 200 against the tensile load along the first direction DR1.
  • the third superconducting wire 30 and the first end 10b and the second end 20b are sandwiched between the first reinforcing member and the second reinforcing member, and reinforcement is required to fix the first reinforcing member and the second reinforcing member to each other, which results in a thick connection portion.
  • the superconducting wire connection structure 100 the first end face 10a and the second end face 20a are engaged, so that the strength against the tensile load along the first direction DR1 is ensured even without the above-mentioned reinforcement. Therefore, the superconducting wire connection structure 100 can be made thin while ensuring the strength against the tensile load.
  • the first superconducting layer 13 and the second superconducting layer 23 are superconductively joined to the third superconducting layer 33 by the connection layer 40, so that a large current can be passed from the first superconducting layer 13 to the second superconducting layer 23 via the third superconducting layer 33.
  • the superconducting wire connection structures 100 are stacked to form a laminated structure 300.
  • the superconducting wire connection structures 100 can be made thin, so even if the laminated structure 300 is formed by stacking superconducting wire connection structures 100, it is possible to suppress an increase in thickness.
  • the first convex portion 10d is engaged with the second concave portion 20c, and the second convex portion 20d is engaged with the first concave portion 10c, thereby engaging the first end face 10a and the second end face 20a. That is, in the superconducting wire connection structure 100, the tensile load along the first direction DR1 is supported at multiple points, and is prevented from concentrating at one point.
  • the shape of the first concave portion 10c, the shape of the first convex portion 10d, the shape of the second concave portion 20c, and the shape of the second convex portion 20d are composed of only curves in a plan view, so that stress concentration is suppressed when a tensile load along the first direction DR1 is applied. Furthermore, in the superconducting wire connection structure 100, the interface distance between the first end face 10a and the second end face 20a is greater than the width of the first superconducting wire 10 and the width of the second superconducting wire 20. Therefore, according to the superconducting wire connection structure 100, it is possible to increase the strength against the tensile load along the first direction DR1.
  • the first end face 10a and the second end face 20a can be engaged by fitting the first convex portion 10d into the second concave portion 20c and the second convex portion 20d into the first concave portion 10c, so that the first end face 10a and the second end face 20a can be easily engaged.
  • oxygen reintroduction step S6 oxygen is supplied through the boundary between the first end face 10a and the second end face 20a to the first superconducting layer 13 at the first end face 10b, the second superconducting layer 23 at the second end face 20b, the third superconducting layer 33, and the connection layer 40.
  • the area of the boundary between the first end face 10a and the second end face 20a is larger than that in the superconducting wire connection structure 200, so that in the oxygen reintroduction step S6, oxygen is more easily supplied to the first superconducting layer 13 at the first end face 10b, the second superconducting layer 23 at the second end face 20b, the third superconducting layer 33, and the connection layer 40.
  • one recess 10e may be formed on the first end face 10a instead of the plurality of first recesses 10c and the plurality of first protrusions 10d
  • one protrusion 20e may be formed on the second end face 20a instead of the plurality of second recesses 20c and the plurality of second protrusions 20d.
  • the first end face 10a and the second end face 20a are engaged with each other by engaging the protrusion 20e with the recess 10e.
  • the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be composed of straight lines only. From another perspective, the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be trapezoidal in plan view.
  • the shape of the first recess 10c, the shape of the first protrusion 10d, the shape of the second recess 20c, and the shape of the second protrusion 20d may be configured by a combination of straight lines and curves.
  • the first end face 10a and the second end face 20a may be inclined with respect to the second direction DR2 in a plan view.
  • the first end face 10a and the second end face 20a may have a portion inclined with respect to the second direction DR2 at a first angle and a portion inclined with respect to the second direction DR2 at a second angle different from the first angle.
  • the area of the first end face 10a and the area of the second end face 20a are increased, so that the first end face 10a and the second end face 20a are more firmly engaged with each other.
  • the superconducting wire connection structure according to the second embodiment is referred to as a superconducting wire connection structure 100A.
  • differences from the superconducting wire connection structure 100 will be mainly described, and overlapping descriptions will not be repeated.
  • superconducting wire connection structure 100A has a first superconducting wire 10, a second superconducting wire 20, a third superconducting wire 30, and a connection layer 40.
  • first end face 10a and second end face 20a are engaged with each other, thereby connecting first superconducting wire 10 to second superconducting wire 20.
  • the configuration of superconducting wire connection structure 100A is common to the configuration of superconducting wire connection structure 100.
  • the first intermediate layer 12 and the first superconducting layer 13 at both ends of the first end 10b in the second direction DR2 have been removed.
  • the second intermediate layer 22 and the second superconducting layer 23 at both ends of the second end 20b in the second direction DR2 have been removed.
  • the third intermediate layer 32 and the third superconducting layer 33 at both ends in the second direction DR2 have been removed.
  • the third substrates 31 at both ends in the second direction DR2 are joined to the first substrates 11 at both ends of the first end 10b in the second direction DR2 by welds 61.
  • the third substrates 31 at both ends in the second direction DR2 are joined to the second substrates 21 at both ends of the second end 20b in the second direction DR2 by welds 62.
  • the configuration of the superconducting wire connection structure 100A differs from the configuration of the superconducting wire connection structure 100.
  • the method for manufacturing the superconducting wire connection structure 100A includes a preparation step S1, an end face processing step S2, a microcrystalline layer forming step S3, an end face engagement step S4, a superconducting joining step S5, and an oxygen reintroduction step S6.
  • the method for manufacturing the superconducting wire connection structure 100A is common to the method for manufacturing the superconducting wire connection structure 100.
  • the manufacturing method of the superconducting wire connection structure 100A further includes a removal step S7 and a welding step S8.
  • the removal step S7 the first intermediate layer 12 and the first superconducting layer 13 at both ends of the first end 10b in the width direction of the first superconducting wire 10 are removed, and the second intermediate layer 22 and the second superconducting layer 23 at both ends of the second end 20b in the width direction of the second superconducting wire 20 are removed.
  • the third intermediate layer 32 and the third superconducting layer 33 at both ends in the width direction of the third superconducting wire 30 are further removed.
  • the welding process S8 is performed after the end face engagement process S4 and before the superconducting joining process S5.
  • spot welding is performed, so that the partially melted first substrate 11 and third substrate 31 are mixed and solidified to form a welded portion 61.
  • spot welding is performed, so that the partially melted second substrate 21 and third substrate 31 are mixed and solidified to form a welded portion 62.
  • the manufacturing method of the superconducting wire connection structure 100A differs from the manufacturing method of the superconducting wire connection structure 100.
  • the tensile load along the first direction DR1 is supported by the joining of the first substrate 11 and the third substrate 31 by the weld 61 and the joining of the second substrate 21 and the third substrate 31 by the weld 62, so that strength against the tensile load along the first direction DR1 is further ensured.
  • 100 superconducting wire connection structure 10 first superconducting wire, 10a first end face, 10b first end, 10c first recess, 10d first convex, 10e recess, 11 first substrate, 12 first intermediate layer, 13 first superconducting layer, 14 first stabilization layer, 20 second superconducting wire, 20a second end face, 20b second end, 20c second recess, 20d second convex, 20e convex, 21 second substrate, 22 second intermediate layer, 23 second superconducting layer, 24 second stabilization layer, 30 third superconducting wire, 31 third substrate material, 32 third intermediate layer, 33 third superconducting layer, 40 connection layer, 50 microcrystalline layer, 61, 62 welded portion, 100A superconducting wire connection structure, 200 superconducting wire connection structure, 300 laminated structure, DR1 first direction, DR2 second direction, S1 preparation process, S2 end face processing process, S3 microcrystalline layer formation process, S4 end face engagement process, S5 superconducting joining process, S6 oxygen reintr

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

L'invention concerne une structure de connexion de matériau de fil supraconducteur qui est équipée : d'un premier matériau de fil supraconducteur qui a un premier substrat, d'une première couche intermédiaire positionnée sur le premier substrat, et d'une première couche supraconductrice positionnée sur la première couche intermédiaire ; et d'un second matériau de fil supraconducteur qui a un second substrat, une seconde couche intermédiaire positionnée sur le second substrat, et une seconde couche supraconductrice positionnée sur la seconde couche intermédiaire. Le premier matériau de fil supraconducteur a une première surface d'extrémité, qui est une surface d'extrémité du premier matériau de fil supraconducteur dans la direction longitudinale. Le second matériau de fil supraconducteur a une seconde surface d'extrémité, qui est une surface d'extrémité du second matériau de fil supraconducteur dans la direction longitudinale. En conséquence de l'assemblage de la première surface d'extrémité et de la seconde surface d'extrémité l'une à l'autre, le premier matériau de fil supraconducteur est connecté au second matériau de fil supraconducteur d'une manière telle que le premier substrat, la première couche intermédiaire et la première couche supraconductrice font respectivement face au second substrat, à la seconde couche intermédiaire et à la seconde couche supraconductrice.
PCT/JP2023/033294 2022-10-04 2023-09-13 Structure de connexion de matériau de fil supraconducteur, et structure stratifiée WO2024075481A1 (fr)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04202065A (ja) * 1990-11-30 1992-07-22 Sumitomo Heavy Ind Ltd 酸化物系超電導体と金属系超電導体の接合方法
JPH07182935A (ja) * 1993-12-22 1995-07-21 Toshiba Corp 高周波部材
JPH09306565A (ja) * 1996-05-13 1997-11-28 Sumitomo Electric Ind Ltd 超電導導体の接続構造
JP2010287350A (ja) * 2009-06-09 2010-12-24 Sumitomo Electric Ind Ltd 超電導ケーブルの中間接続構造
JP2013235699A (ja) * 2012-05-08 2013-11-21 Sumitomo Electric Ind Ltd 高温超電導薄膜線材の接合方法および高温超電導薄膜線材
JP2014154320A (ja) * 2013-02-07 2014-08-25 Fujikura Ltd 酸化物超電導線材の接続構造体及び超電導機器
US20190228893A1 (en) * 2015-10-14 2019-07-25 Bruker Hts Gmbh Superconducting structure for connecting tape conductors, in particular having a corrugated or serrated seam
JP2019175637A (ja) * 2018-03-28 2019-10-10 株式会社フジクラ 酸化物超電導線材の接続構造及び接続方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04202065A (ja) * 1990-11-30 1992-07-22 Sumitomo Heavy Ind Ltd 酸化物系超電導体と金属系超電導体の接合方法
JPH07182935A (ja) * 1993-12-22 1995-07-21 Toshiba Corp 高周波部材
JPH09306565A (ja) * 1996-05-13 1997-11-28 Sumitomo Electric Ind Ltd 超電導導体の接続構造
JP2010287350A (ja) * 2009-06-09 2010-12-24 Sumitomo Electric Ind Ltd 超電導ケーブルの中間接続構造
JP2013235699A (ja) * 2012-05-08 2013-11-21 Sumitomo Electric Ind Ltd 高温超電導薄膜線材の接合方法および高温超電導薄膜線材
JP2014154320A (ja) * 2013-02-07 2014-08-25 Fujikura Ltd 酸化物超電導線材の接続構造体及び超電導機器
US20190228893A1 (en) * 2015-10-14 2019-07-25 Bruker Hts Gmbh Superconducting structure for connecting tape conductors, in particular having a corrugated or serrated seam
JP2019175637A (ja) * 2018-03-28 2019-10-10 株式会社フジクラ 酸化物超電導線材の接続構造及び接続方法

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