JP2014154320A - Connection structure of oxide superconductive wire rod and superconductive apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the connection structure of oxide superconductive wire rods having no generation of a level difference in connected parts, and a superconductive apparatus provided with the connection structure.SOLUTION: Provided is a connection structure of respective superconductive wire rods each having a tape-shaped base material, and an intermediate layer, an oxide superconducting layer, a protective layer and a metal stabilizing layer formed at the upper part of the base material, and, regarding the respective edge parts to be connected in the superconductive wire rods, the respective edge faces of the connection parts are butt-joined via a conductive joining material.

Description

  The present invention relates to an oxide superconducting wire connection structure and a superconducting device.

Superconducting devices such as cables, coils, motors and magnets using oxide superconductors as low-loss conductive materials have been developed. As a superconductor used in these superconducting devices, for example, Bi-based superconducting wires _{(Bi 2 Sr 2 CaCu 2 O} 8 + δ: Bi2212, Bi 2 Sr 2 Ca 2 Cu 3 O 10 + δ: Bi2223) or RE-123-based superconducting wires ( REBa ₂ Cu ₃ O _7-x : RE is a rare earth element including Y and Gd).
In general, an RE-123-based oxide superconducting wire is formed by forming an oxide superconducting layer on a tape-shaped metal substrate through an intermediate layer having good crystal orientation, and then covering the oxide superconducting layer with Ag. A protective layer made of Cu and a metal stabilizing layer made of Cu are laminated, and if necessary, an insulation treatment is applied to the outer periphery to obtain a superconducting wire. The metal stabilizing layer is provided as a current path when the superconducting wire is dislocated from the superconducting state to the normal conducting state for some reason.

  As such a tape-shaped oxide superconducting wire connecting structure, the structures described in the following Patent Documents 1 and 2 are known.

Special table 2003-50587 gazette Republished WO2001 / 033580

In the connection structures described in Patent Documents 1 and 2, since the superconducting wires are superposed on each other at the connection portion, the thickness of the connection portion is larger than that of the unconnected portion. When a superconducting wire having such a thick portion locally is applied to a structure in which wires such as a superconducting coil overlap each other, there is a possibility that the corresponding portion of the superconducting wire adjacent at the edge of the connecting portion is mechanically deteriorated.
In addition, when an oxide superconducting wire having a locally thick portion is applied to a superconducting coil, the current density is locally reduced at the connecting portion, which may deteriorate the uniformity of the magnetic field generated by the superconducting coil.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a connection structure of an oxide superconducting wire having a structure in which the thickness of a connection portion does not increase, a manufacturing method thereof, and a superconducting device including the connection structure. .

An oxide superconducting wire connecting structure according to the present invention comprises a tape-like base material, an intermediate layer formed above the base material, an oxide superconducting layer, a protective layer, and a metal stabilizing layer. It is a connection structure between wires, and the end portions to be connected of the superconducting wires are butt-joined with each other via a conductive bonding material.
In the case of butt joining between the connecting end faces via the conductive bonding material via the conductive bonding material, the oxide superconducting layers can be connected with the shortest distance via the conductive bonding material.
Further, it is possible to eliminate a step at the connection end portion that occurs in the case of an overlapping connection structure or the like. For this reason, when the oxide superconducting wire is coiled, a step does not occur when the upper oxide superconducting wire is wound on the lower oxide superconducting wire, and the distortion to the oxide superconducting wire due to the step is eliminated. Therefore, it is possible to provide a coil that does not cause deterioration of the superconducting characteristics at the connection portion.
In addition, since the oxide superconducting wire is provided with a base material and a metal stabilization layer, a connection structure having high joint strength can be obtained by joining the base materials or the metal stabilization layers via a conductive joint material. Can provide.

In the connection structure of the present invention, the connection end face of the superconducting wire is composed of an end face perpendicular to the length direction of the superconducting wire.
If the end faces orthogonal to the length direction of the tape-shaped superconducting wire are butt-joined via the conductive bonding material, the tape-shaped oxide superconducting wires can be joined with the simplest connection structure. In addition, the oxide superconducting layer of one oxide superconducting wire and the oxide superconducting layer of the other oxide superconducting wire can be connected via a conductive bonding material at the shortest distance.

In the connection structure of the present invention, an inclined joint portion for gradually reducing the width of the connection end portion from the base end side to the tip end side is formed at the connection end portion of the superconducting wire. The sloped end face of the other superconducting wire and the sloped end face of the sloped joint portion of the other superconducting wire can be butt-joined via a conductive joining material.
It is possible to obtain a connection structure in which the joint portion made of the conductive joint material is disposed obliquely with respect to the length direction of the superconducting wire. According to this structure, even if the oxide superconducting wire has a small width, it is possible to ensure the length of the joining portion by the conductive joining material, and thus it is possible to provide a joining structure having high joining strength.

In the connection structure of the present invention, a key-type joint portion is formed in which the connection end portion of the superconducting wire is provided with a portion that partially reduces the width of the connection end portion in the length direction of the connection end portion, The side surface of the key-type joint portion of the superconducting wire and the side surface of the key-type joint portion of the other superconducting wire can be joined together with a conductive joint material.
If the key-type joints are joined to each other, when the side surfaces are joined with the conductive joint material, one key-type joint and the other key-type joint are unevenly fitted together. Since the oxide superconducting wire and the other oxide superconducting wire can be joined, the joint strength is improved, and a large area of the part to be joined through the conductive joining material can be secured, so that the connection structure has excellent electrical joining properties. Can provide.

In the connection structure of the present invention, the width of the connection end portion of the superconducting wires obtained by butt-joining the joint portion of the one superconducting wire and the joint portion of the other superconducting wire is the portion other than the connection end portion. The thickness of the connecting end where the joints are butted and joined to each other can be made equal to the thickness of the superconducting wire other than the connecting end.
According to the connection structure, it is possible to provide a connection structure that can be joined without changing the width of the superconducting wire to be connected in the joining portion and in which no step is generated in the connecting portion.

The superconducting device of the present invention is characterized by including the oxide superconducting wire connecting structure described in any of the above.
Since it is possible to provide a superconducting device having a structure without a step at the connecting portion of the oxide superconducting wire, a superconducting device in which the superconducting characteristics are not deteriorated due to the generation of a stepped portion compared to the conventional structure in which the connecting portion has a stepped portion is provided. Can provide.

  ADVANTAGE OF THE INVENTION According to this invention, in a structure which connects an oxide superconducting wire, it does not thicken a connection part but can provide the connection structure without a level | step difference. For this reason, when this oxide superconducting wire is coiled, even if the oxide superconducting wire on the lower layer side is disposed on the oxide superconducting wire on the lower layer side, other oxide superconducting wires positioned above and below the connecting portion Thus, it is possible to provide a connection structure in which a load does not act on the substrate and the superconducting characteristics are not deteriorated.

FIG. 1A is a plan view of a connection structure of an oxide superconducting wire according to the first embodiment of the present invention, and FIG. 1B is a cross-sectional view of the connection structure. Fig.2 (a) is a top view of the connection structure of the oxide superconducting wire of 2nd Embodiment which concerns on this invention, FIG.2 (b) is sectional drawing of the connection structure. FIG. 3A is a plan view of a connection structure of an oxide superconducting wire according to a third embodiment of the present invention, and FIG. 3B is a cross-sectional view of the connection structure. FIG. 4A is a plan view of a connection structure of an oxide superconducting wire according to a fourth embodiment of the present invention, and FIG. 4B is a cross-sectional view of the connection structure. FIG. 5 is a plan view of an oxide superconducting wire connecting structure according to a fifth embodiment of the present invention. FIG. 6 is a plan view of an oxide superconducting wire connecting structure according to a sixth embodiment of the present invention. FIG. 7 is a plan view of an oxide superconducting wire connecting structure according to a seventh embodiment of the present invention. The perspective view which shows an example of the superconducting cable provided with the connection structure of the oxide superconducting wire which concerns on this invention. The perspective view which shows an example of the superconducting current limiting device provided with the connection structure of the oxide superconducting wire which concerns on this invention. The perspective view which shows an example of the superconducting motor provided with the connection structure of the oxide superconducting wire which concerns on this invention. The perspective view which shows an example of the superconducting coil provided with the connection structure of the oxide superconducting wire which concerns on this invention. The graph which shows the connection resistance in the connection structure manufactured in the Example.

Hereinafter, a first embodiment of a connection structure of oxide superconducting wires according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. In addition, the drawings used in the following description may show the main parts in an enlarged manner for convenience in order to make the features of the present invention easier to understand, and the dimensional ratios of the respective components are the same as the actual ones. Not always.
FIG. 1 shows an oxide superconducting wire connecting structure according to the first embodiment. The oxide superconducting wire 1 applied to the connecting structure A is one surface (surface) of a tape-like substrate 10. The intermediate layer 11, the oxide superconducting layer 12, the protective layer 13, and the metal stabilizing layer 14 are laminated on the upper side. In the oxide superconducting wire 1, a tape-like superconducting laminate 15 is configured by laminating an intermediate layer 11, an oxide superconducting layer 12, and a protective layer 13 on a base material 10.
In the present embodiment, two oxide superconducting wires 1 butt-join the end faces 1a of their end portions through a conductive bonding material 2 having a predetermined thickness to form a connection structure A.

Below, each element which comprises the oxide superconducting wire 1 is demonstrated.
In the oxide superconducting wire 1, the base material 10 is preferably in the form of a tape, a sheet, or a thin plate in order to make a long superconducting wire having flexibility. The material used for the substrate 10 is preferably a material having a relatively high mechanical strength, heat resistance, and a metal that can be easily processed into a wire, such as stainless steel and hastelloy. Examples thereof include various heat-resistant metal materials such as nickel alloys, or materials obtained by arranging ceramics on these various metal materials. Among these, a commercially available product is preferably Hastelloy (trade name, manufactured by Haynes, USA), which is known as a kind of Ni alloy. This kind of Hastelloy includes Hastelloy B, C, G, N, W, etc., which have different amounts of components such as molybdenum, chromium, iron, cobalt, etc., and any kind can be used here. Moreover, what is necessary is just to adjust the thickness of the base material 10 suitably according to the objective, and is 10-500 micrometers normally, Preferably it is 20-200 micrometers. Moreover, as the base material 2, an oriented Ni—W alloy tape base material in which a texture is introduced into a nickel alloy can also be applied.

As the intermediate layer 11, a structure in which an underlayer composed of a diffusion prevention layer or a bed layer, an alignment layer, and a cap layer are laminated in this order can be applied as an example.
When the base material 10 or another layer receives a thermal history as a result of heat treatment when forming another layer on the upper surface side of this layer, a part of the constituent elements of the base material 10 diffuses. And it has a function which suppresses mixing into the oxide superconducting layer 12 side as an impurity. A specific example of the diffusion preventing layer is not particularly limited as long as it can exhibit the above functions, but Al ₂ O ₃ , Si ₃ N ₄ , or GZO (Gd _A single layer structure or a multilayer structure composed of ₂ Zr ₂ O ₇ ) or the like is desirable.

The bed layer is used to suppress the reaction of the constituent elements at the interface between the base material 10 and the oxide superconducting layer 12 and improve the orientation of the layer provided above this layer. The specific structure of the bed layer is not particularly limited as long as it can exhibit the above functions, but Y ₂ O ₃ , CeO ₂ , La ₂ O ₃ , Dy ₂ O ₃ , Er ₂ O, which have high heat resistance. ₃ , a single layer structure or a multilayer structure composed of rare earth oxides such as Eu ₂ O ₃ and Ho ₂ O ₃ is desirable. Both the diffusion preventing layer and the bed layer may be provided, or only one of them may be provided, and may be omitted depending on the constituent material of the alignment layer.

The alignment layer has a function of controlling the crystal orientation of the cap layer and the oxide superconducting layer 12 formed thereon, a function of suppressing the constituent elements of the substrate 10 from diffusing into the oxide superconducting layer 12, It has a function of alleviating a difference in physical properties such as a coefficient of thermal expansion and a lattice constant between the base material 10 and the oxide superconducting layer 12. The constituent material of the alignment layer is not particularly limited as long as it can exhibit the above functions. When a metal oxide such as Gd ₂ Zr ₂ O ₇ , MgO, or ZrO ₂ —Y ₂ O ₃ (YSZ) is used, a crystal is formed in an ion beam assisted deposition method (hereinafter sometimes referred to as IBAD method). This is particularly preferable because a highly oriented layer can be obtained and the crystal orientation of the cap layer and the oxide superconducting layer 6 can be improved.

The cap layer controls the crystal orientation of the oxide superconducting layer 12 to be equal to or higher than that of the oriented layer to diffuse the elements constituting the oxide superconducting layer 12 toward the intermediate layer 11, It has a function of suppressing the reaction between the gas used during lamination and the intermediate layer 11. The material of the cap layer is not particularly limited as long as it can express the above _{functions, CeO 2, Y 2 O 3} , Al 2 O 3, Gd 2 O 3, ZrO 2, Ho 2 O 3, Nd 2 Metal oxides such as O ₃ and LMnO ₃ are preferable from the viewpoint of lattice matching with the oxide superconducting layer 6. Among these, CeO ₂ or LMnO ₃ is particularly suitable from the viewpoint of matching with the oxide superconducting layer 12. Here, when CeO ₂ is used for the cap layer, the cap layer may include a Ce—M—O-based oxide in which part of Ce is substituted with another metal atom or metal ion.

The oxide superconducting layer 12 has a function of flowing current when in the superconducting state. As the material used for the oxide superconducting layer 12, a material composed of an oxide superconductor having a generally known composition can be widely applied. Examples thereof include a copper oxide superconductor such as a Y-based superconductor. It is done. Examples of the composition of the Y-based superconductor include REBa ₂ Cu ₃ O _7-x (RE is a rare earth element such as Y, La, Nd, Sm, Er, Gd, and x is oxygen deficiency). thereof _{include, Y123 (YBa 2 Cu 3 O} 7-x), include _{Gd123 (GdBa 2 Cu 3 O 7} -x). Although the base material of this oxide superconductor is an insulator, it becomes an oxide superconductor with a well-crystallized structure by incorporating oxygen by oxygen annealing, and has the property of exhibiting superconducting properties. In order for the oxide superconducting layer 12 to exhibit such excellent crystal orientation, the oxide superconducting layer 12 is formed on the above-described cap layer having good crystal orientation.
If the oxide superconducting layer 12 has such an excellent crystal orientation, the superconducting conductor 20 exhibits excellent critical current characteristics when cooled to below the critical temperature and energized.

  The protective layer 13 becomes a current path that bypasses an overcurrent generated due to some accident when the oxide superconducting wire 1 is energized, and in order to make it easier for oxygen to be taken into the oxide superconducting layer 12, the protective layer 13 transmits oxygen during heating. Has a function to facilitate. For this reason, it is preferable that the protective layer 13 is formed from Ag or a material containing at least Ag. The material for forming the protective layer 13 may be a mixture or alloy containing a noble metal such as Au or Pt, or a plurality of these may be used.

  In the present embodiment, the metal stabilization layer 14 is provided on the superconducting laminate 15. The metal stabilization layer 14 varies depending on the application of the oxide superconducting wire 1. For example, when used for a superconducting cable, a superconducting motor, or the like, it is used as a main part of a bypass that commutates an overcurrent generated when a quench occurs due to some accident and the oxide superconducting layer 12 transitions to a normal conducting state. At this time, the material used for the metal stabilization layer 14 is made of a relatively inexpensive material such as copper, a Cu-Zn alloy (brass), a copper alloy such as a Cu-Ni alloy, aluminum, an aluminum alloy, or stainless steel. It is preferable to use copper, and it is preferable to use copper because it has high conductivity and is inexpensive. Further, when the oxide superconducting wire 1 is used for a superconducting fault current limiter, the stabilization layer is used to instantaneously suppress an overcurrent generated when a quench occurs and the state transitions to a normal conducting state. In the case of this application, examples of the material used for the metal stabilization layer 14 include a high resistance metal such as a Ni-based alloy such as Ni—Cr.

  The metal stabilization layer 14 is mainly composed of a metal tape bonding structure or a plating layer. When the metal stabilizing layer 14 has a metal tape bonding structure, a conductive bonding material such as solder is provided on the inner surface side of the metal stabilizing layer 14. In the structure shown in FIG. 1B, the display of the conductive bonding material is omitted, but as a tin alloy such as solder constituting the conductive bonding material, for example, Sn, Sn—Ag alloy, Sn—Bi alloy, Examples include lead-free solder made of an alloy containing Sn as a main component, such as Sn—Cu alloy, Sn—Zn alloy, Pb—Sn alloy solder, eutectic solder, low temperature solder, and the like. , Or a combination of two or more.

An end face 1a perpendicular to the length direction of the oxide superconducting wire 1 is formed at the end of the oxide superconducting wire 1 shown in FIG. 1, and two tape-like oxide superconducting wires 1 are formed between the end faces 1a. Are electrically and mechanically bonded with a conductive bonding material 2 having a predetermined thickness interposed therebetween. Further, the end faces 1a of the oxide superconducting wire 1 are aligned and connected so as not to form a step portion in the width direction and the thickness direction. Accordingly, the side surfaces of the oxide superconducting wire 1 are aligned along the same plane as shown in FIG. 1 (a) at the connecting portion, and the top surfaces of the oxide superconducting wire 1 are connected as shown in FIG. 1 (b). And the lower surface are aligned so as to be along the same plane.
The conductive bonding material used here can be the same as the conductive bonding material used in the case of the metal tape bonding structure described above. When the base material 10 is a nickel alloy such as Hastelloy, the base materials 10 can be connected to each other by using a strong acid as the flux containing the resin used for soldering.

  Moreover, there is no restriction | limiting in particular about the thickness (thickness in alignment with the length direction of the oxide superconducting wire 1) of the electroconductive joining material 2, It can be set as the thickness of about several micrometers-several tens of micrometers.

The connection structure A shown in FIG. 1 has a structure in which tape-shaped oxide superconducting wires 1 are mechanically and electrically joined to each other by a conductive joining material 2 through their end faces 1a. Here, the conductive bonding material 2 mechanically connects the bases 10 of the one oxide superconducting wire 1 and the metal stabilizing layer 14 with sufficient mechanical strength, so that the oxide superconducting wires 1 and 1 are connected to each other. Necessary and sufficient connection strength can be obtained as a joint structure. In addition, when using Ni alloy as the base material 10, since the metal material which comprises the metal stabilization layer 14 has higher adhesiveness with the conductive joining materials 2 such as solder, the adhesiveness with the base material 10 is temporarily Even if it is low, the required connection strength can be obtained if the metal stabilizing layers 14 are in close contact with the conductive bonding material 2.
1 illustrates a structure in which the conductive bonding material 2 is accommodated between the end faces 1a of the oxide superconducting wire 1, but the conductive bonding material 2 is the surface of the metal stabilization layer 14. A structure that protrudes somewhat to the side and adheres to the surface side of the metal stabilizing layer 14 may be used. Further, a structure in which the conductive bonding material 2 protrudes somewhat on the back surface side of the base material 10 and adheres to the back surface side of the base material 10 may be employed. Even if the conductive bonding material 2 protrudes somewhat outside the oxide superconducting wire 1, there is no problem.
When joining the oxide superconducting wires 1 to each other, the oxide superconducting wires 1 are mutually centered by using a jig having a groove having the same width so that the end faces 1a to be joined are not displaced. It is preferable to join while aligning so as not to shift. It is preferable that soldering is performed after the ends of both oxide superconducting wires 1 are pushed into the groove of the jig described above and positioned while being suppressed from above. At this time, even if the solder slightly protrudes around the wire rod, the amount of solder protruding from the connecting portion is small, and the width at the connecting portion hardly increases.

The end face 1a of the oxide superconducting wire 1 is preferably an end face 1a which is made as smooth as possible by cutting off the end of the manufactured oxide superconducting wire 1 by some means and having no foreign matter or inclusions on the cut surface. For this reason, in the case where the end portion of the manufactured oxide superconducting wire 1 is cut to form an end surface, the oxide superconducting layer 12 in the vicinity of the cut surface is damaged by cutting with a scissors or a cutting tool, and the superconductivity at the connection portion Since characteristics deteriorate, it is preferable to use a laser-cut surface.
Further, in order to clean the cut surface, it is preferable that the cut surface is polished to eliminate foreign matters and shape defects so that the surface is as smooth as possible before joining. When mechanically cut using a cutting tool such as a scissors, the hardness of the base material 10 is higher than the hardness of the metal stabilizing layer 14, so that the cut surface of the oxide superconducting wire 1 is less likely to be a uniform and smooth cut surface. Irregularities and uneven portions are likely to occur on the cut surface. In this respect, it is easier to obtain a smooth cut surface by laser cutting the oxide superconducting wire 1 than by mechanical cutting.

According to the connection structure A shown in FIG. 1, the joined oxide superconducting wires 1, 1 are cooled to a critical temperature or lower and energized to the oxide superconducting layer 12 of one oxide superconducting wire 1, thereby A current can be passed through the oxide superconducting layer 12 of the oxide superconducting wire 1. In the connection structure A, the current flowing in one oxide superconducting wire 1 flows from one oxide superconducting layer 12 to the oxide superconducting layer 12 of the other oxide superconducting wire 1 through the conductive bonding material 2. Alternatively, a part of the current flows to the other oxide superconducting wire 1 side through the protective layer 13 or the metal stabilizing layer 14 and the conductive bonding material 2.
In the connection structure A, the end portion of the oxide superconducting layer 12 of one oxide superconducting wire 1 and the end portion of the oxide superconducting layer 12 of the other oxide superconducting wire 1 are interposed through the thin conductive bonding material 2. Since it is joined at a close position, good electrical joining can be obtained. In addition, assuming that a current flows through the protective layer 13 and the metal stabilization layer 14, the flow path resistance is as much as possible because it is an energization path through the protective layer 13 and the metal stabilization layer 14 located very close via the conductive bonding material 2. It can be made smaller, and the amount of heat generated at the connecting portion can be reduced.

FIG. 2 shows an oxide superconducting wire connecting structure according to the second embodiment. The oxide superconducting wire 3 applied to the connecting structure B is one surface (surface) of a tape-like substrate 10. A superconducting laminate 15 is formed by laminating the intermediate layer 11, the oxide superconducting layer 12, and the protective layer 13, and the outer periphery of the superconducting laminate 15 is covered with a metal stabilizing layer 14A.
In the present embodiment, two oxide superconducting wires 3 butt-join the end faces 3a of their end portions through the layered conductive bonding material 2 to form a connection structure B.

The base material 10, the intermediate layer 11, the oxide superconducting layer 12, and the protective layer 13 used in the second embodiment are the base material 10, the intermediate layer 11, the oxide superconducting layer 12 used in the first embodiment, It is equivalent to the protective layer 13.
The metal stabilization layer 14A used in the second embodiment is made of the same material as the metal stabilization layer 14 used in the first embodiment, but is provided so as to cover the outer periphery of the superconducting laminate 15. Is different. The structure covering the outer periphery of the superconducting laminate 15 may be a structure in which the entire circumference of the superconducting laminate 15 is completely covered, or the superconducting laminate 15 having a C-shaped cross section so that the back side of the substrate 10 is left a little. You may adopt the structure which covered. In the case of a structure covering the entire circumference of the superconducting laminate 15, a metal stabilization layer 14 </ b> A made of Cu formed by a plating layer can be exemplified, and the superconducting laminate is left leaving a part of the back surface side of the substrate 10. The structure covering the outer periphery of the body 15 can be a structure in which a metal tape such as Cu is plastically deformed into a C-shaped cross section by a tape forming method using a roll or a die.

In the structure of the second embodiment, the two oxide superconducting wires 3 provided with the metal stabilizing layer 14A covering the outer periphery of the superconducting laminate 15 have their end faces 3a facing each other and are electrically conductive between the end faces. The connection structure B is configured by bonding the bonding material 2 and bonding them. The conductive bonding material 2 that connects the two oxide superconducting wires 3 is the same as the conductive bonding material 2 of the first embodiment. The configuration in which the end surface 3a is an end surface orthogonal to the length direction of the oxide superconducting wire 3 is the same as the end surface 1a of the first embodiment.
The connection structure B of the second embodiment is different from the previous connection structure A in that the metal stabilization layer 14A is provided so as to cover the outer periphery of the superconducting laminate 15 at the end surface 3a. The metal stabilizing layers 14A existing in the region are mechanically and electrically joined to each other by the conductive joining material 2. The point that the end surfaces of the superconducting laminate 15 provided inside the metal stabilizing layer 14A are butt-joined via the conductive bonding material 2 is the same as the structure of the first embodiment.
In the connection structure B having such a structure, the metal stabilization layer 14A having excellent adhesion to the conductive bonding material 2 is provided so as to surround the periphery of the end face 3a, and has a larger area than the first embodiment. Since the stabilization layers 14A can be connected to each other, a structure with higher connection strength than the structure of the first embodiment can be obtained.

Furthermore, since the outer periphery of the oxide superconducting laminate 15 is covered with the metal stabilizing layer 14A and the oxide superconducting layer 12 is sealed, the oxide superconducting layer 12A inside the metal stabilizing layer 14A is directed to the oxide superconducting layer 12 side. Can prevent moisture intrusion. In addition, the metal stabilization layer 14A surrounding the superconducting laminate 15 also prevents moisture from entering the oxide superconducting layer 12 inside the connecting portion at the connecting portion.
Among rare earth oxide superconductors, there are materials that react with moisture, and a structure that can prevent the oxide superconducting layer 12 from being deteriorated by moisture is considered important. For this reason, the outer periphery of the superconducting laminate 15 is covered with the metal stabilizing layer 14A, and also at the connection portion, the metal stabilizing layer 14A together with the conductive bonding material 2 can prevent moisture from entering the oxide superconducting layer 12 side. Then, it is possible to provide a connection structure B that does not cause deterioration of superconducting characteristics due to moisture intrusion.
Other operational effects can be obtained in the same manner as the connection structure A of the first embodiment.

  FIG. 3 shows a connection structure of oxide superconducting wire according to the third embodiment. The oxide superconducting wire 4 applied to the connection structure C of this embodiment is one surface of a tape-like substrate 10. The structure is the same as that of the first embodiment in that the intermediate layer 11, the oxide superconducting layer 12, the protective layer 13, and the metal stabilizing layer 14C are stacked on the (surface). In the oxide superconducting wire 1, a superconducting laminate 15 is configured by laminating an intermediate layer 11, an oxide superconducting layer 12, and a protective layer 13 on a substrate 10.

In the present embodiment, two oxide superconducting wires 4 butt-join the inclined end surfaces 4a of their tip portions through the conductive bonding material 2 having a predetermined thickness to form a connection structure C. A difference from the structure of the first embodiment is that inclined joint portions 4A for gradually reducing the width of the oxide superconducting wire 4 are formed on the connection end portion side of the oxide superconducting wire 4, and the inclined joint portions 4A This is a point where the inclined end faces 4 a are joined via the conductive joining material 5. The inclined portion of the inclined joint portion 4A is opposite in the two oxide superconducting wires 4 to be connected at the same inclination rate, and the inclined end surfaces 4a are aligned and connected by the conductive bonding material 5, thereby oxidizing. The superconducting wire rods 4 and 4 are connected so as not to form a step portion in the width direction and the thickness direction of the connecting portion.
That is, the inclined end faces of the oxide superconducting wire 4 are aligned along the same plane as shown in FIG. 3 (a) at the connection portion, and the upper surface of the oxide superconducting wire 4 is shown in FIG. 3 (b). The two and the bottom are aligned with each other along the same plane.

  In the connection structure C shown in FIG. 3, the conductive bonding material 5 interposed between the inclined joint portion 4A of one oxide superconducting wire 4 and the inclined joint portion 4A of the other oxide superconducting wire 4 is first. Since it is made longer than the conductive bonding material 2 of the first embodiment, it is possible to make the connection strength higher than that of the structure of the first embodiment. Moreover, it becomes possible to adjust the length of the conductive bonding material 5 by adjusting the inclination angle of the inclined end surface 4a in the inclined joint portion 4A of the oxide superconducting wire 4, and according to the length of the conductive bonding material 5. Any connection resistance can be obtained. That is, the connection resistance can be adjusted by adjusting the inclination angle of the inclined end face 4a of the inclined joint portion 4A.

In order to obtain the connection structure C shown in FIG. 3, a cutting method using a cutting tool such as a scissors used in manufacturing the end surface 1a of the oxide superconducting wire 1 of the first embodiment or laser cutting using a laser. When any one of the methods is performed, a process of cutting the end portion of the oxide superconducting wire 4 in an oblique direction may be performed. Surface finishing and cleaning of the inclined end surface 4a can be performed in the same manner as in the case of finishing the end surface 1a of the oxide superconducting wire 1 of the first embodiment.
Other operational effects are the same as those of the connection structure A of the first embodiment.

FIG. 4 shows an oxide superconducting wire connecting structure according to a fourth embodiment. The oxide superconducting wire 6 applied to the connecting structure D of this embodiment is a surface of a tape-like substrate 10. On the (surface), an intermediate layer 11, an oxide superconducting layer 12, and a protective layer 13 are laminated to form a superconducting laminate 15, and the outer periphery of the superconducting laminate 15 is covered with a metal stabilizing layer 14D. Yes.
In the present embodiment, two oxide superconducting wires 6 butt-join the inclined end faces 6a of their tip portions via a conductive bonding material 7 having a predetermined thickness to form a connection structure D.

  The metal stabilization layer 14 </ b> D used in the fourth embodiment is made of the same material as the metal stabilization layer 14 used in the second embodiment, and is provided so as to cover the outer periphery of the superconducting laminate 15. The same applies to the point. The structure covering the outer periphery of the superconducting laminate 15 may be a structure in which the outer periphery of the superconducting laminate 15 is completely covered, or the superconducting laminate 15 having a C-shaped cross section in a form leaving the back side of the substrate 10 a little. A structure in which is covered may be adopted. In the case of a structure in which the entire outer periphery of the superconducting laminate 15 is covered, a metal stabilization layer 14D made of Cu formed by a plating layer can be exemplified, and the superconductivity is left with a part on the back side of the substrate 10 being left. The structure in which the outer periphery of the laminate 15 is covered can be a structure in which a metal tape such as Cu is plastically deformed into a C-shaped cross section by a tape forming method using a roll or a die.

An inclined joint portion 6A for gradually reducing the width of the oxide superconducting wire 6 is formed on the connecting end portion side of the oxide superconducting wire 6, and the inclined end surfaces 6a of these inclined joint portions 6A connect the conductive bonding material 7 to each other. The point joined via is the same as the structure of the third embodiment. The inclined portions of the inclined joint portion 6A are opposite to each other in the two oxide superconducting wires 6 to be connected with the same inclination rate, and the inclined end faces 6a are aligned and connected by the conductive bonding material 7, thereby providing an oxide. The superconducting wires 6 and 6 are connected so that no stepped portion is formed in the width direction and the thickness direction of their connecting portions.
That is, the inclined end faces of the oxide superconducting wire 6 are aligned along the same plane as shown in FIG. 4 (a) at the connecting portion, and the upper surface of the oxide superconducting wire 6 is shown in FIG. 4 (b). The two and the bottom are aligned with each other along the same plane.

  In the connection structure D shown in FIG. 4, the conductive bonding material 7 interposed between the inclined joint portion 6 </ b> A of one oxide superconducting wire 6 and the inclined joint portion 6 </ b> A of the other oxide superconducting wire 6 is first. Since it is longer than the conductive bonding material 2 of the first embodiment, it is possible to make the connection strength higher than that of the structure of the first embodiment. Moreover, it becomes possible to adjust the length of the conductive bonding material 7 by adjusting the inclination angle of the inclined end surface 6a in the inclined joint portion 6A of the oxide superconducting wire 6, and according to the length of the conductive bonding material 7. Any connection resistance can be obtained. That is, the connection resistance can be adjusted by adjusting the inclination angle of the inclined end surface 6a of the inclined joint portion 6A.

Further, since the outer periphery of the oxide superconducting laminate 15 is covered with the metal stabilization layer 14D and the oxide superconducting layer 12 is hermetically sealed, the oxide superconducting layer 12D inside the metal stabilizing layer 14D is directed to the oxide superconducting layer 12 side. Can prevent moisture intrusion. In addition, the metal stabilization layer 14D surrounding the superconducting laminate 15 also prevents moisture from entering the oxide superconducting layer 12 inside the connecting portion at the connecting portion.
Among rare earth-based oxide superconductors, there are materials that are reactive with moisture, and a structure that can prevent the oxide superconducting layer 12 from being deteriorated by moisture is considered important. For this reason, the outer periphery of the superconducting laminate 15 is covered with the metal stabilizing layer 14D, and also at the connecting portion, the metal stabilizing layer 14D together with the conductive bonding material 7 can prevent moisture from entering the oxide superconducting layer 12 side. Then, it is possible to provide a connection structure D that does not cause deterioration of superconducting characteristics due to moisture penetration.
Other functions and effects can be obtained in the same manner as the connection structure A of the third embodiment.

FIG. 5 shows an oxide superconducting wire connecting structure according to a fifth embodiment. The oxide superconducting wire 8 applied to the connecting structure E of this embodiment is a surface of a tape-like substrate 10. On the (surface), an intermediate layer 11, an oxide superconducting layer 12, and a protective layer 13 are laminated to form a superconducting laminate 15, and the surface of the superconducting laminate 15 is covered with a metal stabilizing layer 14E. Yes.
In this embodiment, two oxide superconducting wires 8 butt-join the end faces 8a of their tip portions through a layered conductive bonding material 9 to form a connection structure E.

On the connection end portion side of the oxide superconducting wire 8, a key joint portion 8 </ b> A having an uneven portion in plan view that partially reduces the width of the oxide superconducting wire 8 in the length direction of the wire is formed. The side surfaces 8 a of the key joint 8 </ b> A are joined together via the conductive joining material 9.
The concavo-convex portion 8B of the key joint 8A has the same size and opposite direction in the two oxide superconducting wires 8 to be connected, and the concavo-convex portions 8B of the side surfaces 8a are fitted together and connected by the conductive bonding material 9. Thus, the oxide superconducting wires 8 and 8 are connected so that no stepped portion is formed in the width direction and the thickness direction of the connecting portion. That is, as shown in FIG. 5, the side surfaces of the oxide superconducting wires 8 and 8 are aligned along the same plane as shown in FIG. 5, and the upper and lower surfaces of the oxide superconducting wires 8 and 8 are along the same plane. So that they are aligned.

The connection structure E shown in FIG. 5 includes a conductive bonding material 9 interposed between a key joint 8A of one oxide superconducting wire 8 and a key joint 8A of the other oxide superconducting wire 8. Since it can be made longer than the conductive bonding material of the first embodiment, the connection strength can be made higher than that of the structure of the previous embodiment. Furthermore, since the oxide superconducting wires 8 and 8 are connected by fitting the key-type joint portions 8A to each other, the joint strength due to the mechanical fitting structure between the key-type joint portions 8A is also high. Can be obtained.
In addition, it is possible to adjust the length of the conductive bonding material 9 by adjusting the length of the key joint 8A of the oxide superconducting wire 8, and any length corresponding to the length of the conductive bonding material 9 can be obtained. Connection resistance can be obtained. Furthermore, the key-type joint portion 8A can secure a joining area and a large area of the conductive joining material 9 without increasing the length (connection length).
Other structures are the same as those obtained by the structure of the first embodiment.
Further, the number of the concavo-convex portions 8B formed in the key joint portion 8A shown in FIG. 5 is not limited to the number shown in FIG. 5, and one or more arbitrary numbers may be formed.

FIG. 6 shows an oxide superconducting wire connecting structure according to a sixth embodiment. The oxide superconducting wire 16 applied to the connecting structure F of this embodiment is a surface of a tape-like substrate 10. On the (surface), an intermediate layer 11, an oxide superconducting layer 12, and a protective layer 13 are laminated to form a superconducting laminate 15, and the surface of the superconducting laminate 15 is covered with a metal stabilizing layer 14F. Yes.
In this embodiment, two oxide superconducting wires 16 butt-join the end faces 16a of their tip portions with a conductive bonding material 17 having a predetermined thickness to form a connection structure F.

On the connection end portion side of the oxide superconducting wire 16, a key joint 16 </ b> A having a planar view wave-shaped portion that partially reduces the width of the oxide superconducting wire 16 in the length direction of the wire is formed. The side surfaces 16 a of the key-shaped joint portion 16 </ b> A are joined together via the conductive joining material 17.
The concavo-convex portion 16B of the key joint 16A has the same size and opposite direction in the two oxide superconducting wires 16 to be connected, and the concavo-convex portions 16B between the side surfaces 16a are fitted together and connected by the conductive bonding material 17. Thus, the oxide superconducting wires 16 and 16 are connected so that no stepped portion is formed in the width direction and the thickness direction of the connecting portion. That is, as shown in FIG. 6, the side surfaces of the oxide superconducting wires 16 and 16 are aligned along the same plane as shown in FIG. 6, and the upper and lower surfaces of the oxide superconducting wires 16 and 16 are along the same plane. So that they are aligned.

A connection structure F shown in FIG. 6 includes a conductive bonding material 17 interposed between a key joint 16A of one oxide superconducting wire 16 and a key joint 16A of the other oxide superconducting wire 16. Since it can be made longer than the conductive bonding material of the first embodiment, it is possible to make the connection strength higher than that of the structure of the first embodiment. Further, since the oxide superconducting wires 16 and 16 are connected by fitting the key joints 16A to each other, the joint strength due to the mechanical fitting structure of the key joints 16A is also high. Can be obtained.
Moreover, it becomes possible to adjust the length of the conductive bonding material 17 by adjusting the length of the key-type joint portion 16A of the oxide superconducting wire 16, and any length corresponding to the length of the conductive bonding material 17 can be obtained. Connection resistance can be obtained.
Other structures are the same as those obtained by the structure of the first embodiment.

FIG. 7 shows an oxide superconducting wire connecting structure according to a seventh embodiment. The oxide superconducting wire 18 applied to the connecting structure G of this embodiment is a surface of the tape-shaped substrate 10 ( The superconducting laminate 15 is formed by laminating the intermediate layer 11, the oxide superconducting layer 12, and the protective layer 13 on the surface), and the surface of the superconducting laminate 15 is covered with the metal stabilizing layer 14G. .
In this embodiment, two oxide superconducting wires 18 butt-join the end surfaces 18a of their tip portions through a layered conductive bonding material 19 to form a connection structure G.

On the connection end portion side of the oxide superconducting wire 18, a key joint 18A having a convex portion in plan view that partially reduces the width of the oxide superconducting wire 18 is formed. The side surfaces 16 a and the front end surfaces are joined to each other through a conductive joining material 19.
The key-type joint portion 18A has the same size and opposite direction in the two oxide superconducting wires 18 to be connected, and the key-type joint portion 18A is abutted and connected by the conductive bonding material 19, whereby the oxide superconductor The wire rods 18 and 18 are connected so as not to produce a step portion in the width direction and the thickness direction of the connecting portion. That is, as shown in FIG. 7, the side surfaces of the oxide superconducting wires 18 and 18 are aligned along the same plane as shown in FIG. 7, and the upper and lower surfaces of the oxide superconducting wires 18 and 18 are along the same plane. So that they are aligned.

The connection structure G shown in FIG. 7 includes a conductive joint material 19 interposed between a key joint portion 18A of one oxide superconducting wire 18 and a key joint portion 18A of the other oxide superconducting wire 18. Since it can be made longer than the conductive bonding material of the first embodiment, it is possible to make the connection strength higher than that of the structure of the first embodiment.
Further, it is possible to adjust the length of the conductive bonding material 19 by adjusting the length of the key joint portion 18A of the oxide superconducting wire 18, and any length corresponding to the length of the conductive bonding material 19 can be obtained. Connection resistance can be obtained.
Other structures are the same as those obtained by the structure of the first embodiment.

  The connection structures E, F, and G shown in FIGS. 5 to 7 have been described as examples in which the metal stabilizing layers 14E, 14F, and 14G are formed on the surface side of the oxide superconducting wires 8, 16, and 18, respectively. These metal stabilizing layers 14E, 14F, and 14G may have a structure that surrounds the entire circumference of the metal stabilizing layer. With this structure, there is an effect of preventing moisture from entering the oxide superconducting layer inside.

"Superconducting cable"
Each oxide superconducting wire connected by the connection structures A to G shown in FIGS. 1 to 7 can be applied to, for example, the high-temperature superconducting cable 80 illustrated in FIG. A high-temperature superconducting cable 80 shown in FIG. 8 forms a superconducting layer 1S by arranging a plurality of layers of the oxide superconducting wire 1 in a winding shape on the outer periphery of a former 81 provided at the center, and an insulating layer 82 and superconducting on the outer periphery thereof. The shield layer 1U and the protective layer 83 are formed to constitute the core cable 85, and the core cable 85 is accommodated inside the heat insulating tube 84 with a gap for refrigerant circulation. The heat insulating tube 84 has, for example, a double tube structure including an inner tube 84a and an outer tube 84c, and a vacuum heat insulating layer 84b is formed between the inner tube 84a and the outer tube 84c. Superconducting shield layer 1U is configured by arranging oxide superconducting wire 1 in a multi-layer winding shape.

  Since such a high-temperature superconducting cable 80 is manufactured as a long cable, the oxide superconducting wire 1 forming the superconducting layer 1S or the oxide superconducting wire 1 constituting the superconducting shield layer 1U is connected in a necessary number. Necessary. For this reason, the oxide superconducting wire 1 to which the connection structures A to G shown in FIGS. 1 to 7 are applied.

"Superconducting fault current limiter"
The oxide superconducting wire connected by any one of the connection structures A to G shown in FIGS. 1 to 7 can be applied to the superconducting fault current limiter 99 shown in FIG. 9, for example.
In the superconducting fault current limiter 99 shown in FIG. 4, the oxide superconducting wire provided with the connection structures A to G shown in FIGS. 1 to 7 is wound around a winding drum over a plurality of layers, and the superconducting fault current limiting module 90. And is stored in a liquid nitrogen container 95 filled with liquid nitrogen 98 as the superconducting fault current limiter module 90. Further, the liquid nitrogen container 95 is stored inside a vacuum container 96 that blocks heat from the outside.

The liquid nitrogen container 95 has a liquid nitrogen filling part 91 and a refrigerator 93 in the upper part, and a heat anchor 92 and a hot plate 97 are provided below the refrigerator 93.
The superconducting current limiter 99 has a current lead portion 94 for connecting an external power source (not shown) to the superconducting current limiter module 90.
When used as the superconducting current limiter module 90 of the superconducting current limiter 99 as described above, the oxide superconducting wire uses a high resistance metal such as Ni—Cr for the metal stabilizing layer as described above. Use what you had.

"Superconducting motor"
The oxide superconducting wire connected by any of the connection structures A to G shown in FIGS. 1 to 7 can be applied to the superconducting motor 130 shown in FIG.
The superconducting motor 130 includes a cylindrical rotor 132 that is rotatably supported in a cylindrical sealed container 131.
A plurality of superconducting motor coils 135 are attached around the central portion of the rotating shaft 133, and a plurality of copper coils made of copper coils supported on the inner wall side of the container 131 around the plurality of superconducting motor coils 135. The normal conducting coil 136 is arranged.
The superconducting motor coil 135 is formed by winding an oxide superconducting wire having connection structures A to G shown in FIGS. 1 to 7 around a rectangular bobbin.
The rotating shaft 133 is provided with a plurality of pipes for allowing the cooling gas to flow in or out, and the cooling gas is introduced into the container 131 from a refrigerant supply device (not shown) separately provided outside to cool the cooling gas. The superconducting motor coil 135 can be cooled to a critical temperature or lower by gas. The superconducting motor coil 135 is cooled below the critical temperature, but the normal conducting coil 136 is configured as a normal temperature part.

  The superconducting motor 130 shown in FIGS. 10A and 10B introduces a cooling gas into the container 131 and uses the cooling gas to cool the superconducting motor coil 135 below the critical temperature. A necessary current is supplied to the normal conducting coil 136 from a power supply (not shown) separately, and a necessary current is supplied to the superconducting motor coil 135 from a power supply (not shown) separately, resulting in a magnetic field generated by both coils. The rotating shaft 133 can be rotated by the rotational force thus used and used as the superconducting motor 130.

"Superconducting coil"
The pancake coil 101 shown in FIG. 11 (b) provided with the oxide superconducting wire connected by any one of the connection structures A to G shown in FIGS. 1 to 7 can be configured. Moreover, the superconducting coil 100 which emits the strong magnetic force shown to Fig.11 (a) can be formed by laminating | stacking several pancake coils 101 and connecting each pancake coil 101 mutually.
As described above, the oxide superconducting wire provided with any of the connection structures A to G shown in FIGS. 1 to 7 can be used for various superconducting devices.
Here, the superconducting device is not particularly limited as long as it has a structure connecting the oxide superconducting wires and the above, for example, a superconducting cable, a superconducting motor, a superconducting current limiter, a superconducting coil, a superconducting transformer, a superconducting device. An electric power storage device etc. can be illustrated.

Hereinafter, the content of the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.
A plurality of tape-shaped substrates having a width of 10 mm and a thickness of 100 μm made of Hastelloy (trade name Hastelloy C-276, manufactured by Haynes, USA) were prepared, and the surface was polished.
Next, a diffusion prevention layer, a bed layer, an alignment layer, and a cap layer were laminated in this order on one surface of a plurality of substrates under the following formation conditions. When each film is formed, a feed reel and a take-up reel that transport the tape-shaped substrate are provided inside the film forming apparatus, and the film is sequentially formed on the substrate while moving the substrate at a predetermined speed. Went.
First, a 100 nm-thick diffusion prevention layer made of Al ₂ O ₃ is formed on a tape-like substrate by ion beam sputtering, and then Y ₂ is formed on the diffusion prevention layer by ion beam sputtering. A bed layer made of O ₃ and having a thickness of 20 nm was formed. Next, an alignment layer having a thickness of 10 nm made of MgO was formed on the bed layer by IBAD.

After forming the alignment layer, a 400 nm-thick cap layer made of CeO ₂ is formed by the PLD method, and an oxide superconducting layer (thickness 2 μm) having a composition of GdBa ₂ Cu ₃ O _7-x is formed. A protective layer of 2 μm Ag was formed by sputtering to obtain a laminate. This laminated body was subjected to oxygen annealing treatment in an oxygen atmosphere at 500 ° C. for 10 hours to obtain an oxide superconducting laminated body.
Next, a metal tape made of Cu having a width of 10 mm and a thickness of 0.1 mm, a metal tape having a Sn plating of 2 μm in thickness on one side is bonded onto the protective layer, and the protective layer is Sn conductively bonded An oxide superconducting wire having a structure covered with a metal stabilizing layer was obtained.
Two oxide superconducting conductors obtained in the above process are prepared, and the end of each superconducting wire is cut with a laser device in an oblique direction with respect to the length direction of each end, and an inclined joint is attached to the end of each superconducting wire. Part was formed. The inclined end surface of the inclined joint portion at the end of one oxide superconducting wire and the inclined end surface of the inclined joint portion at the other end of the oxide superconducting wire are formed in alternate directions, both of which are shown in FIG. The shape is such that it can be joined like a connection structure.

Further, when the end portion of the oxide superconducting wire was cut with a laser device, the butt length shown in FIG. 3 was changed to 0 mm, 10 mm, 50 mm, 100 mm, and 300 mm by changing the cutting angle to prepare a sample. The case where the butt length is 0 mm corresponds to the structure of FIG. Therefore, when the butt length L = 10 mm in the table, the length of the connection surface is 2 ^1/2 × 10 mm.
The oxide superconducting wires after cutting were butt-joined using Sn alloy solder in a ratio of Sn: Pb = 60: 40 to obtain a connection structure sample.

  The oxide superconducting wire having each connection structure was cooled to 77K with liquid nitrogen, and the connection resistance value was measured when the oxide superconducting wire was energized. The result is shown in FIG.

From the measurement results shown in FIG. 12, it can be seen that the connection resistance is approximately inversely proportional to the value of the connection length L, and that an arbitrary resistance value can be obtained by adjusting the connection length L.
The larger the connection area, the smaller the connection resistance. Therefore, the larger connection area is desirable. The structure shown in FIGS. 5 to 7 is preferably applied as a structure that can increase the contact area as much as possible without excessively increasing the connection length L.
Separately from the above sample, a connection structure sample having a connection length L = 25 mm was prepared using equivalent Sn solder using the above-described oxide superconducting wire, and its breaking strength was measured. As a result, a value exceeding 20 kgf was shown. Therefore, it showed a sufficient breaking strength as a connection structure. In addition, if it has such a breaking strength, it can be applied to the connection of a superconducting cable or a superconducting wire for a small superconducting magnet.

  A, B, C, D, E, F, G ... Connection structure 1, 3, 4, 6, 8, 16, 18 ... Oxide superconducting wire, 1a, 3a ... End face, 4A, 6A ... Inclined joint 4a, 6a ... Inclined end face 2, 5, 7, 9, 17, 19 ... Conductive bonding material, 8A, 16A, 18A ... Key joint, 10 ... Base material, 11 ... Intermediate layer, 12 ... Oxide Superconducting layer, 13 ... protective layer, 14, 14A, 14C, 14D ... metal stabilization layer, 15 ... superconducting laminate, 80 ... superconducting cable (superconducting equipment), 99 ... superconducting current limiter (superconducting equipment), 130 ... superconducting Motor (superconducting equipment), 100 ... superconducting coil (superconducting equipment).

Claims (5)

  A connection structure between a superconducting wire having a tape-like base material and an intermediate layer formed above the base material, an oxide superconducting layer, a protective layer, and a metal stabilizing layer, and connecting the superconducting wire A connection structure of oxide superconducting wires, characterized in that the end surfaces of the connection end portions are butt-joined with each other via conductive bonding materials.   2. The connection structure for an oxide superconducting wire according to claim 1, wherein an end surface of a connecting end portion of the superconducting wire is an end surface orthogonal to a length direction of the superconducting wire.   An inclined joint portion is formed in the connecting end portion of the superconducting wire so that the width of the connecting end portion gradually decreases from the base end side to the tip end side, and the inclined end surface of the inclined joint portion of one superconducting wire and the other superconducting wire material. The connecting structure for an oxide superconducting wire according to claim 1, wherein the inclined end surfaces of the inclined joint portion are butt-joined via a conductive bonding material.   A key-type joint portion provided with a portion for partially reducing the width of the connection end portion in the length direction of the connection end portion is formed at the connection end portion of the superconducting wire, and the key-type joint portion of one superconducting wire 2. The oxide superconducting wire connecting structure according to claim 1, wherein the side surface of the first superconducting wire and the side surface of the key joint portion of the other superconducting wire are butt-joined via a conductive bonding material.   The superconducting apparatus provided with the connection structure of the oxide superconducting wire as described in any one of Claims 1-4.

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