High-temperature superconducting conductor

Abstract

To obtain a high-temperature superconductor in which reduction in critical current is suppressed.SOLUTION: The high-temperature superconducting conductor 10 includes a cylindrical metal rod 2 and a tape-shaped high-temperature superconducting wire 1 spirally wound around the metal rod 2, and the high-temperature superconducting wire 1 includes a high-temperature superconducting portion 9 having a tape-shaped substrate 3, a high-temperature superconducting layer 5 formed on one surface of the substrate 3 via an intermediate layer 4, a protective layer 6 formed on one surface of the high-temperature superconducting layer 5, and a stabilization layer 7 covering the periphery of the substrate 3, the intermediate layer 4, the high-temperature superconducting layer 5, and the protective layer 6; The high-temperature superconducting wire 1 is wound around the metallic rod 2 with the 101a of the lower surface on the substrate 3 side facing the metallic rod 2 and the 101b of the upper surface on the high-temperature superconducting layer 5 side facing the outside.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a high-temperature superconducting conductor using a high-temperature superconducting wire.

Background Art

[0002] The development of a composite conductor using a high-temperature superconducting wire for high magnetic field application has been underway. Among the high-temperature superconducting wires used for composite conductors, yttrium-based high-temperature superconducting wires are particularly excellent in magnetic field characteristics, and high performance of the conductor is expected. The yttrium-based high-temperature superconducting wire has a superconducting layer formed on a tape-shaped substrate. However, since the superconducting layer is a thin film and the yttrium-based superconducting material itself is a ceramic, it is vulnerable to mechanical stress. For this reason, a conductor structure has been proposed to protect against distortion generated during conductor formation and coil winding, as well as electromagnetic stress during energization.

[0003] As disclosed in Non-Patent Document 1, as one of the conductor structures, a high-temperature superconducting conductor in which a tape-shaped yttrium-based high-temperature superconducting wire is spirally wound around a metal rod has been developed. The high-temperature superconducting spiral conductor is excellent in flexibility and can apply a large current because the former diameter can be reduced.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the high-temperature superconducting conductor disclosed in Non-Patent Document 1 has a structure in which a superconducting layer thinner than the substrate is formed on the substrate. Therefore, the high-temperature superconducting layer is not located in the center of the wire's thickness direction, and when the wire is bent with the high-temperature superconducting layer facing inward, compressive strain is generated in the high-temperature superconducting layer, and conversely, when the wire is bent with the high-temperature superconducting layer facing outward, tensile strain is generated in the high-temperature superconducting layer. Yttrium-based superconducting materials are weak against tensile strain, and the critical current, which is the maximum current that can be conducted, decreases. Therefore, when manufacturing a conductor by spirally winding tape-shaped yttrium-based high-temperature superconducting wire around a metal rod, there was a problem of performance degradation when the high-temperature superconducting layer was wound facing outward.

[0006] This disclosure has been made in view of the above, and aims to obtain a high-temperature superconducting conductor that suppresses the decrease in critical current. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the high-temperature superconducting conductor according to this disclosure comprises a cylindrical metal rod and a tape-shaped high-temperature superconducting wire spirally wound around the metal rod. The high-temperature superconducting wire comprises a tape-shaped substrate, a high-temperature superconducting layer formed on one side of the substrate via an intermediate layer, a protective layer formed on one side of the high-temperature superconducting layer, and a stabilizing layer covering the substrate, the intermediate layer, the high-temperature superconducting layer, and the protective layer, and a metal portion arranged such that the high-temperature superconducting layer is located in the center in the thickness direction of the high-temperature superconducting wire. The high-temperature superconducting wire is wound around the metal rod with the substrate side facing the metal rod and the high-temperature superconducting layer side facing outwards. [Effects of the Invention]

[0008] According to this disclosure, it is possible to obtain a high-temperature superconducting conductor in which the decrease in critical current is suppressed. [Brief explanation of the drawing]

[0009] [Figure 1] Overall diagram of the high-temperature superconducting conductor according to Embodiment 1 [Figure 2]Cross-sectional view of a high-temperature superconducting conductor according to Embodiment 1 [Figure 3] Cross-sectional view of a high-temperature superconducting wire used in a high-temperature superconducting conductor according to Embodiment 1. [Figure 4] Cross-sectional view of the high-temperature superconducting portion used in the high-temperature superconducting conductor according to Embodiment 1. [Figure 5] A diagram showing the configuration of the high-temperature superconducting wire of the high-temperature superconducting conductor according to Embodiment 2. [Figure 6] A diagram showing the configuration of a high-temperature superconducting wire for a high-temperature superconducting conductor according to Embodiment 3. [Figure 7] A diagram showing the configuration of a high-temperature superconducting wire for a high-temperature superconducting conductor according to Embodiment 4. [Figure 8] A diagram showing the configuration of a high-temperature superconducting wire for a high-temperature superconducting conductor according to Embodiment 5. [Modes for carrying out the invention]

[0010] The high-temperature superconducting conductor according to the embodiment will be described in detail below with reference to the drawings.

[0011] Embodiment 1. Figure 1 is an overall view of the high-temperature superconducting conductor according to Embodiment 1. Figure 2 is a cross-sectional view of the high-temperature superconducting conductor according to Embodiment 1. The high-temperature superconducting conductor 10 according to Embodiment 1 comprises high-temperature superconducting wires 1a, 1b, and 1c and a metal rod 2. In the following description, when distinguishing between the three high-temperature superconducting wires 1a, 1b, and 1c, they will be referred to as high-temperature superconducting wire 1a, high-temperature superconducting wire 1b, or high-temperature superconducting wire 1c. When referring to the high-temperature superconducting wires 1a, 1b, and 1c collectively without distinction, they will be referred to as high-temperature superconducting wire 1. Note that in Figure 2, only high-temperature superconducting wire 1a is shown, and the high-temperature superconducting wires 1b and 1c are omitted from the illustration.

[0012] The metal rod 2 is cylindrical. Alternatively, the metal rod 2 may be a cylindrical shape with a hole in the axial direction. Furthermore, the metal rod 2 may be made by twisting together multiple cylindrical metal rods.

[0013] The high-temperature superconducting wire 1 is in the form of a tape and is wound spirally around a metal rod 2. Three high-temperature superconducting wires 1a are wound side by side around the metal rod 2, and three high-temperature superconducting wires 1b are wound side by side on top of the high-temperature superconducting wires 1a. Furthermore, three high-temperature superconducting wires 1c are wound side by side on top of the high-temperature superconducting wires 1b. In other words, the high-temperature superconducting wires 1a, 1b, and 1c are wound on the metal rod 2 in this order. The high-temperature superconducting wires 1a, 1b, and 1c within the same layer are wound so that they do not overlap.

[0014] As shown in Figure 1, the high-temperature superconducting wires 1a, 1b, and 1c are wound in a spiral shape and arranged in multiple layers. The second layer, high-temperature superconducting wire 1b, is wound in the opposite direction to the winding rotation direction of the first layer, high-temperature superconducting wire 1a. The third layer, high-temperature superconducting wire 1c, is wound in the opposite direction to the winding rotation direction of the second layer, high-temperature superconducting wire 1b. By reversing the winding rotation direction of the high-temperature superconducting wire 1 for each layer in this way, the solenoid magnetic field generated by the current flowing through each layer can be reduced, and the amount of current that can be conducted through the conductor can be increased. Figure 1 shows a configuration in which the winding rotation direction of the first layer of high-temperature superconducting wire 1a and the winding rotation direction of the second layer of high-temperature superconducting wire 1b are opposite, and the winding rotation direction of the second layer of high-temperature superconducting wire 1b and the winding rotation direction of the third layer of high-temperature superconducting wire 1c are opposite. However, the winding may be done so that the winding rotation direction of the first layer of high-temperature superconducting wire 1a and the winding rotation direction of the second layer of high-temperature superconducting wire 1b are in the same direction. Alternatively, the winding may be done so that the winding rotation direction of the second layer of high-temperature superconducting wire 1b and the winding rotation direction of the third layer of high-temperature superconducting wire 1c are in the same direction.

[0015] Figure 3 is a cross-sectional view of a high-temperature superconducting wire used in a high-temperature superconducting conductor according to Embodiment 1. The high-temperature superconducting wire 1 comprises a high-temperature superconducting portion 9 and a metal portion 8.

[0016] FIG. 4 is a cross-sectional view of a high-temperature superconducting portion used in the high-temperature superconducting conductor according to Embodiment 1. The high-temperature superconducting portion 9 includes a substrate 3, an intermediate layer 4, a high-temperature superconducting layer 5, a protective layer 6, and a stabilizing layer 7. As shown in FIG. 4, in the high-temperature superconducting portion 9, the intermediate layer 4 is laminated on one surface of the tape-shaped substrate 3, the high-temperature superconducting layer 5 is laminated on one surface of the intermediate layer 4, and the protective layer 6 is laminated on one surface of the high-temperature superconducting layer 5. Further, in the high-temperature superconducting portion 9, the stabilizing layer 7 is provided so as to surround the entire laminated substrate 3, intermediate layer 4, high-temperature superconducting layer 5, and protective layer 6. Note that the high-temperature superconducting portion 9 may have a configuration in which at least one of the intermediate layer 4 and the protective layer 6 is omitted.

[0017] In the following description, the components of the high-temperature superconducting wire 1 will be described using xyz orthogonal coordinates having three axes, an x-axis, a y-axis, and a z-axis, which are perpendicular to each other. The z direction is the longitudinal direction of the high-temperature superconducting wire 1. The y direction is the lamination direction of each layer of the superconducting wire, and is referred to as the thickness direction. The x direction is referred to as the width direction. Hereinafter, the dimension in the width direction will be simply referred to as "width", and the dimension in the thickness direction will be simply referred to as "thickness". In the thickness direction, the direction from the substrate 3 toward the high-temperature superconducting layer 5 is defined as "up", and the direction from the high-temperature superconducting layer 5 toward the substrate 3 is defined as "down".

[0018] The high-temperature superconducting wire 1 in which the metal portion 8 and the high-temperature superconducting portion 9 are joined is spirally wound around the metal rod 2 with the lower surface 10la facing the metal rod 2 side and the upper surface 101b facing the outside. The high-temperature superconducting wire 1a including the metal portion 8 wound around the metal rod 2 is joined to the metal rod 2 using solder or other alloys at at least a part of the surface in contact with the metal rod 2.

[0019] The substrate 3 is a tape-shaped metal substrate. For the substrate 3, a nickel alloy such as Hastelloy (registered trademark) can be applied, but a metal different from the exemplified material may be used. The thickness of the substrate 3 is the largest among the layers constituting the high-temperature superconducting portion 9.

[0020] The intermediate layer 4 does not have to consist of only one layer; for example, it may have a multilayer structure in which layers such as an Al2O3 layer, a Y2O3 layer, an MgO layer, a CeO2 layer, or a LaMnO3 layer are stacked.

[0021] The high-temperature superconducting layer 5 is laminated on the upper surface of the intermediate layer 4. In the high-temperature superconducting section 9, where the intermediate layer 4 is omitted, the high-temperature superconducting layer 5 is laminated on the upper surface of the substrate 3.

[0022] The high-temperature superconducting layer 5 is formed using an oxide superconductor. For example, the high-temperature superconducting layer 5 is ReBa2Cu3O 7-δ It can be formed using ReBCO oxide superconductors represented by the chemical formula. The symbol "Re" in the above chemical formula is a rare earth metal, including yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. The element with the symbol "Re" is compound ReBa2Cu3O 7-δ Any element other than those exemplified above may be used, as long as it exhibits superconducting properties below a certain temperature. Also, δ in the above chemical formula is the amount of oxygen deficiency and takes a value in the range of 0 to 1. The material of the high-temperature superconducting layer 5 may be a superconductor other than the oxide superconductors described above, and its constituent elements do not need to contain oxygen.

[0023] The position of the high-temperature superconducting layer 5 in the thickness direction is above the center of the thickness of the high-temperature superconducting wire 1.

[0024] The protective layer 6 is laminated on the upper surface of the high-temperature superconducting layer 5. The protective layer 6 can be formed using a highly conductive metal such as silver, gold, or an alloy using these materials.

[0025] The stabilization layer 7 is applied so as to surround the entire laminated substrate 3, intermediate layer 4, high-temperature superconducting layer 5, and protective layer 6. Therefore, the stabilization layer 7 forms the bottom surface 111a, which is the substrate 3 side end face of the high-temperature superconducting portion 9, the top surface 111b, which is the high-temperature superconducting layer 5 side end face, and the sides 111c and 111d. The sides 111c and 111d are surfaces that connect the bottom surface 111a and the top surface 111b. The stabilization layer 7 can be formed using a highly conductive metal such as copper or a copper alloy.

[0026] The metal part 8 is tape-shaped with the same width as the high-temperature superconducting part 9 and is made of a metal such as copper, silver, or gold that has good conductivity and flexibility.

[0027] As shown in Figure 3, the metal part 8 is joined to the upper surface 111b of the high-temperature superconducting part 9 via a brazed joint 91. The thickness of the metal part 8 is set so that the high-temperature superconducting layer 5 is located in the center of the thickness direction of the high-temperature superconducting wire 1. In this specification, the center of the thickness direction is the position where, when the high-temperature superconducting wire 1 is bent in the thickness direction with its upper surface 101b facing outward, the tensile strain on the high-temperature superconducting layer 5 is reduced compared to the case where the metal part 8 is not joined. The high-temperature superconducting layer 5 does not need to be located in the center of the thickness direction where the distance from the lower surface 101a is equal to the distance from the upper surface 101b.

[0028] As described above, by joining the metal part 8 to the high-temperature superconducting part 9, it is possible to suppress the tensile strain generated in the high-temperature superconducting layer 5 when the high-temperature superconducting wire 1 is wound around the metal rod 2 with the lower surface 101a facing the metal rod 2 side and the upper surface 101b facing outwards, thereby suppressing a decrease in the allowable current value.

[0029] The examples of materials for each part of the high-temperature superconducting wire 1 described above are merely representative, and the materials for each part of the high-temperature superconducting wire 1 are not limited to the examples above.

[0030] Furthermore, while this example uses a configuration with three high-temperature superconducting wires 1 in each layer, the number of high-temperature superconducting wires 1 in each layer may be one, two, or four or more. In this case, the high-temperature superconducting wires 1 within the same layer are wound so that they do not overlap. Note that the number of high-temperature superconducting wires 1 in each layer does not need to be the same; the number may differ from layer to layer.

[0031] Next, a method for manufacturing the high-temperature superconducting conductor 10 according to Embodiment 1 will be described. The high-temperature superconducting conductor 10 is manufactured by joining a metal part 8 to a high-temperature superconducting part 9, and then spirally winding the high-temperature superconducting wire 1, which has the metal part 8 attached, around the metal rod 2 with its lower surface 101a facing the metal rod 2 and its upper surface 101b facing outwards.

[0032] A known method for manufacturing high-temperature superconducting wires can be applied to the manufacturing method of the high-temperature superconducting section 9. For example, first, a tape-shaped substrate 3 is created. Next, an intermediate layer 4 is laminated on the upper surface of the substrate 3. Then, a high-temperature superconducting layer 5 is laminated on the upper surface of the intermediate layer 4. Next, a protective layer 6 is laminated on the upper surface of the high-temperature superconducting layer 5. Then, a stabilizing layer 7 is attached so as to surround the laminated substrate 3, intermediate layer 4, high-temperature superconducting layer 5 and protective layer 6. The stabilizing layer 7 may be applied by metal plating.

[0033] The metal part 8 is joined to the stabilizing layer 7, which forms the end face of the high-temperature superconducting part 9 on the high-temperature superconducting layer 5 side, by soldering or brazing. At this time, a brazed joint 91 is formed between the stabilizing layer 7, which forms the end face of the high-temperature superconducting part 9 on the high-temperature superconducting layer 5 side, and the metal part 8. For brazing between the stabilizing layer 7, which forms the end face of the high-temperature superconducting part 9 on the high-temperature superconducting layer 5 side, and the metal part 8, an alloy such as solder or a general brazing material is used.

[0034] The high-temperature superconducting conductor 10 is manufactured by spirally winding a high-temperature superconducting wire 1, which has a metal portion 8, around a metal rod 2. Part or all of the contact surface between the high-temperature superconducting wire 1 and the metal rod 2 may be brazed. If there are multiple layers of high-temperature superconducting wire 1, adjacent high-temperature superconducting wires 1 may be brazed together.

[0035] The high-temperature superconducting conductor 10 according to Embodiment 1 includes a metal part 8 joined to the surface of the high-temperature superconducting portion 9 on the high-temperature superconducting layer 5 side, and since the high-temperature superconducting layer 5 is located in the center in the thickness direction of the high-temperature superconducting wire 1, tensile strain is less likely to occur in the high-temperature superconducting layer 5 when the high-temperature superconducting wire 1 is bent with the high-temperature superconducting layer 5 facing outwards, thus preventing a decrease in the allowable current value.

[0036] Embodiment 2. The high-temperature superconducting conductor 10 according to Embodiment 2 is constructed by winding a high-temperature superconducting wire 1 around a metal rod 2, similar to the high-temperature superconducting conductor 10 according to Embodiment 1. Figure 5 is a diagram showing the configuration of the high-temperature superconducting wire of the high-temperature superconducting conductor according to Embodiment 2. In the high-temperature superconducting wire 1 according to Embodiment 2, the metal part 8 comprises a first part 8a and a second part 8b. In addition, in the high-temperature superconducting wire 1 according to Embodiment 2, the brazed joint 91 surrounds the high-temperature superconducting part 9 in the thickness direction and the width direction.

[0037] Both the first portion 8a and the second portion 8b are made of tape-shaped metal. The width of each of the first portion 8a and the second portion 8b is wider than the high-temperature superconducting portion 9. The widths of the first portion 8a and the second portion 8b may be equal. Furthermore, the material of each of the first portion 8a and the second portion 8b is the same as that of the metal portion 8 of the high-temperature superconducting conductor 10 according to Embodiment 1.

[0038] The first portion 8a is joined to the upper surface 111b of the high-temperature superconducting portion 9 via a brazed joint 91. The second portion 8b is also joined to the lower surface 111a of the high-temperature superconducting portion 9 via a brazed joint 91. Both ends of the first portion 8a and the second portion 8b in the width direction protrude from the high-temperature superconducting portion 9, and both ends of the first portion 8a and the second portion 8b in the width direction are located outside the sides 111c and 111d of the high-temperature superconducting portion 9.

[0039] The brazed joint 91 is formed of a brazing material which is solder or other alloy. The brazed joint 91 is positioned to surround the high-temperature superconducting part 9 between the lower surface 111a and the second part 8b, between the upper surface 111b and the first part 8a of the high-temperature superconducting part 9, between the first part 8a including the side surface 111c of the high-temperature superconducting part 9 and the second part 8b, and between the first part 8a including the side surface 111d of the high-temperature superconducting part 9 and the second part 8b, and joins the high-temperature superconducting part 9 to the first part 8a and the second part 8b.

[0040] The thicknesses of the first portion 8a, the second portion 8b, and the brazed portion 91 are set such that the high-temperature superconducting layer 5 is located in the center of the thickness direction of the high-temperature superconducting wire 1.

[0041] In the high-temperature superconducting wire 1 according to Embodiment 2, the high-temperature superconducting portion 9 is sandwiched between the first portion 8a and the second portion 8b of the metal portion 8, and a brazed portion 91 exists around the periphery of the high-temperature superconducting portion 9. This allows for a stronger bond between the high-temperature superconducting portion 9 and the metal portion 8. Furthermore, since the second portion 8b of the metal portion 8 is bonded to the lower surface 111a of the high-temperature superconducting portion 9, and the first portion 8a of the metal portion 8 is bonded to the upper surface 111b of the high-temperature superconducting portion 9, the thicknesses of the first portion 8a and the second portion 8b of the metal portion 8 can be adjusted in various ways so that the high-temperature superconducting layer 5 is located in the center of the thickness.

[0042] The high-temperature superconducting wire 1 according to Embodiment 2 is manufactured by sequentially joining the metal part 8 and the high-temperature superconducting part 9 from the longitudinal end by soldering or the like to form a brazed joint 91.

[0043] The high-temperature superconducting conductor 10 according to Embodiment 2, like the high-temperature superconducting conductor 10 according to Embodiment 1, can suppress the deterioration of the high-temperature superconducting wire 1 due to tensile strain occurring in the high-temperature superconducting layer 5.

[0044] Embodiment 3. The high-temperature superconducting conductor 10 according to Embodiment 3 is constructed by winding a high-temperature superconducting wire 1 around a metal rod 2, similar to the high-temperature superconducting conductor 10 according to Embodiment 1. Figure 6 is a diagram showing the configuration of the high-temperature superconducting wire of the high-temperature superconducting conductor according to Embodiment 3. In the high-temperature superconducting wire 1 according to Embodiment 3, the metal part 8 comprises a first part 8a and a second part 8b. The first part 8a is installed along the upper surface 111b of the high-temperature superconducting part 9, and the second part 8b is installed along the lower surface 111a. The high-temperature superconducting wire 1 also includes brazed joints 91a, 91b that join the high-temperature superconducting part 9 to the first part 8a and the second part 8b. The difference between the high-temperature superconducting wire 1 according to Embodiment 2 is that there are no brazed joints in the portion where the first portion 8a and the upper surface 111b of the high-temperature superconducting portion 9 face each other, and in the portion where the second portion 8b and the lower surface 111a of the high-temperature superconducting portion 9 face each other.

[0045] The first portion 8a and the second portion 8b are the same as the first portion 8a and the second portion 8b of the high-temperature superconducting wire 1 according to Embodiment 2. That is, both the first portion 8a and the second portion 8b are tape-shaped metals, and the width dimension of each of the first portion 8a and the second portion 8b is larger than the width dimension of the high-temperature superconducting portion 9. The width dimension of the first portion 8a and the width dimension of the second portion 8b may be equal. Also, the material of each of the first portion 8a and the second portion 8b is the same as that of the metal portion 8 described in Embodiment 1.

[0046] Both ends of the first portion 8a and the second portion 8b in the width direction protrude from the high-temperature superconducting portion 9, and both ends of the first portion 8a and the second portion 8b in the width direction are located outside the sides 111c and 111d of the high-temperature superconducting portion 9.

[0047] The first portion 8a and the second portion 8b are joined at both ends protruding from the high-temperature superconducting portion 9 by brazed portions 91a and 91b, respectively. Brazed portion 91a joins the side surface 111c of the high-temperature superconducting portion 9 to one end of the first portion 8a and one end of the second portion 8b. Brazed portion 91b joins the side surface 111d of the high-temperature superconducting portion 9 to the other end of the first portion 8a and the other end of the second portion 8b.

[0048] In the high-temperature superconducting wire 1 according to Embodiment 2, the portion where the first portion 8a of the metal portion 8 and the upper surface 111b of the high-temperature superconducting portion 9 face each other, and the portion where the second portion 8b of the metal portion 8 and the lower surface 111a of the high-temperature superconducting portion 9 face each other are joined by brazing. Therefore, when the high-temperature superconducting wire 1 is bent, the stabilizing layer 7 of the high-temperature superconducting wire 1 may peel off, potentially causing the high-temperature superconducting wire 1 to deteriorate. In the high-temperature superconducting wire 1 according to Embodiment 3, since there are no brazed joints in the portion where the first portion 8a of the metal portion 8 and the upper surface 111b of the high-temperature superconducting portion 9 face each other, and the portion where the second portion 8b of the metal portion 8 and the lower surface 111a of the high-temperature superconducting portion 9 face each other, deterioration of the high-temperature superconducting wire 1 due to peeling of the stabilizing layer 7 that occurs when the high-temperature superconducting wire 1 is bent can be prevented.

[0049] The high-temperature superconducting wire 1 according to Embodiment 3 is manufactured by joining the metal part 8 and the high-temperature superconducting part 9 by forming brazed joints 91a and 91b by sequentially soldering the widthwise ends of the first part 8a and the second part 8b, which protrude from the high-temperature superconducting part 9, from the longitudinal ends. At this time, a solvent that inhibits solder penetration, such as oil, may be applied in advance to the lower surface 111a and upper surface 111b of the high-temperature superconducting part 9 so that solder does not penetrate the parts where the first part 8a of the metal part 8 and the upper surface 111b of the high-temperature superconducting part 9 face each other, and where the second part 8b of the metal part 8 and the lower surface 111a of the high-temperature superconducting part 9 face each other.

[0050] The high-temperature superconducting conductor 10 according to Embodiment 3 can suppress deterioration of the high-temperature superconducting wire 1 due to tensile strain occurring in the high-temperature superconducting layer 5 and deterioration of the high-temperature superconducting wire 1 due to peeling of the stabilizing layer 7.

[0051] Embodiment 4. The high-temperature superconducting conductor 10 according to Embodiment 4 is constructed by winding a high-temperature superconducting wire 1 around a metal rod 2, similar to the high-temperature superconducting conductor 10 according to Embodiment 1. Figure 7 shows the configuration of the high-temperature superconducting wire of the high-temperature superconducting conductor according to Embodiment 4. The high-temperature superconducting wire 1 according to Embodiment 7 has a metal part 8 with a U-shaped cross-section perpendicular to the longitudinal direction. The metal part 8 has a first part 8a and a second part 8b extending in the width direction, and one end of each of these is connected by a third part 8c extending in the thickness direction. The width dimensions of the first part 8a and the second part 8b are larger than the width dimension of the high-temperature superconducting part 9, and the entire high-temperature superconducting part 9 is housed inside the U-shaped part of the metal part 8, which is surrounded on three sides by the first part 8a, the second part 8b, and the third part 8c.

[0052] The thickness dimensions of the first portion 8a, the thickness dimensions of the second portion 8b, and the width dimensions of the third portion 8c may be different from each other. The thickness dimensions of the first portion 8a and the second portion 8b are set so that the high-temperature superconducting layer 5 is located in the center of the thickness direction of the high-temperature superconducting wire 1.

[0053] As shown in Figure 7, the metal part 8 and the high-temperature superconducting part 9 are joined by a brazed joint 91 on the open side of the U-shape, including the side surface 111d of the high-temperature superconducting part 9. The high-temperature superconducting part 9 and the metal part 8 are not joined on the lower surface 111a, upper surface 111b, and side surface 111c of the high-temperature superconducting part 9.

[0054] In the high-temperature superconducting wire 1 according to Embodiment 4, the portion where the first portion 8a and the upper surface 111b of the high-temperature superconducting portion 9 face each other, and the portion where the second portion 8b and the lower surface 111a of the high-temperature superconducting portion 9 face each other, are not brazed together with solder or the like. Therefore, similar to the high-temperature superconducting wire 1 according to Embodiment 3, deterioration of the high-temperature superconducting wire 1 due to peeling of the stabilizing layer 7 that occurs when the high-temperature superconducting wire 1 is bent can be prevented.

[0055] The high-temperature superconducting wire 1 according to Embodiment 4 is manufactured by joining the first portion 8a, the second portion 8b, and the side surface 111d of the high-temperature superconducting portion 9 sequentially from the longitudinal end by soldering or the like on the side where the U-shape of the metal portion 8 is open, thereby forming a brazed joint 91. At this time, to prevent solder or other brazing material from penetrating the portion where the first portion 8a of the metal portion 8 and the upper surface 111b of the high-temperature superconducting portion 9 face each other, and where the second portion 8b of the metal portion 8 and the lower surface 111a of the high-temperature superconducting portion 9 face each other, an agent such as oil or grease that inhibits the penetration of solder or other brazing material may be applied in advance to the lower surface 111a of the high-temperature superconducting portion 9 and the upper surface 111b of the high-temperature superconducting portion 9.

[0056] In the high-temperature superconducting wire 1 according to Embodiment 4, the portion where the first portion 8a and the upper surface 111b of the high-temperature superconducting portion 9 face each other, and the portion where the second portion 8b and the lower surface 111a of the high-temperature superconducting portion 9 face each other, are not brazed together by solder or the like. Therefore, deterioration of the high-temperature superconducting wire 1 due to tensile strain in the high-temperature superconducting layer 5 and deterioration of the high-temperature superconducting wire 1 due to peeling of the stabilizing layer 7 can be suppressed.

[0057] Embodiment 5. The high-temperature superconducting conductor 10 according to Embodiment 5 is constructed by winding a high-temperature superconducting wire 1 around a metal rod 2, similar to the high-temperature superconducting conductor 10 according to Embodiment 1. Figure 8 shows the configuration of the high-temperature superconducting wire of the high-temperature superconducting conductor according to Embodiment 5. In the high-temperature superconducting wire 1 according to Embodiment 5, the high-temperature superconducting part 9 and the metal part 8 are directly joined without the use of a brazing joint.

[0058] The metal part 8 is applied so as to cover the entire upper surface 111b of the high-temperature superconducting part 9. The thickness of the metal part 8 is set so that the high-temperature superconducting layer 5 is located in the center in the thickness direction of the high-temperature superconducting wire 1. The material of the metal part 8 is the same as that of the metal part 8 described in Embodiment 1.

[0059] The metal part 8 is, for example, a metal plating layer formed by applying metal plating to the upper surface 111b of the high-temperature superconducting part 9.

[0060] In the high-temperature superconducting wire 1 according to Embodiments 1 to 4, the metal part 8 is joined to the high-temperature superconducting part 9 by brazing using solder or the like. This requires a manufacturing process in which the brazing is heated and melted to bring it into contact with the high-temperature superconducting part 9, which may lead to a decrease in the performance of the high-temperature superconducting wire 1 due to heat. In the high-temperature superconducting wire 1 according to Embodiment 5, the metal part 8 joined to the high-temperature superconducting part 9 is formed by metal plating, so there is no decrease in the performance of the high-temperature superconducting wire 1 due to heat.

[0061] In metal plating methods, the plating thickness can be adjusted by adjusting the processing time for the plating process. Therefore, the high-temperature superconducting wire 1 according to Embodiment 5 allows for easy adjustment of the thickness dimension of the metal part 8.

[0062] Furthermore, the metals used in the brazing, such as solder, have lower conductivity than the metals used in the metal part 8. Since the high-temperature superconducting wire 1 according to Embodiment 5 does not have a brazed joint, it has lower electrical resistance when current is passed through it from the outside compared to the high-temperature superconducting wire 1 according to Embodiments 1 to 4, and thus reduces power loss.

[0063] The configurations shown in the above embodiments are merely examples of the content, and can be combined with other known technologies. It is also possible to omit or modify parts of the configuration without departing from the gist of the invention. [Explanation of symbols]

[0064] 1, 1a, 1b, 1c High-temperature superconducting wire, 2 Metal rod, 3 Substrate, 4 Intermediate layer, 5 High-temperature superconducting layer, 6 Protective layer, 7 Stabilizing layer, 8 Metal part, 8a First part, 8b Second part, 8c Third part, 9 High-temperature superconducting part, 10 High-temperature superconducting conductor, 91, 91a, 91b Brazed joint, 101a, 111a Bottom surface, 101b, 111b Top surface, 111c, 111d Side surface.

Claims

1. The device comprises a cylindrical metal rod and a tape-shaped high-temperature superconducting wire spirally wound around the metal rod. The aforementioned high-temperature superconducting wire is A high-temperature superconducting portion having a tape-shaped substrate, a high-temperature superconducting layer formed on one side of the substrate via an intermediate layer, a protective layer formed on one side of the high-temperature superconducting layer, and a stabilizing layer covering the substrate, the intermediate layer, the high-temperature superconducting layer, and the protective layer, The high-temperature superconducting layer comprises a metal portion arranged such that it is located in the center of the thickness direction of the high-temperature superconducting wire, The high-temperature superconducting wire is wound around the metal rod with the substrate-side surface facing the metal rod side and the high-temperature superconducting layer-side surface facing outwards. The metal portion is tape-shaped and wider than the high-temperature superconducting portion, and has a first portion that is bonded to the stabilizing layer forming the end face of the high-temperature superconducting portion on the high-temperature superconducting layer side, and a second portion that is tape-shaped and wider than the high-temperature superconducting portion, and is bonded to the stabilizing layer forming the end face of the high-temperature superconducting portion on the substrate side. A high-temperature superconducting conductor characterized in that the portions of the first portion and the second portion that protrude from the high-temperature superconducting portion and the stabilizing layer that forms the side surface of the high-temperature superconducting portion are joined via a brazed joint.

2. A cylindrical metal rod and a tape-shaped high-temperature superconducting wire spirally wrapped around the metal rod, The aforementioned high-temperature superconducting wire is A high-temperature superconducting portion having a tape-shaped substrate, a high-temperature superconducting layer formed on one side of the substrate via an intermediate layer, a protective layer formed on one side of the high-temperature superconducting layer, and a stabilizing layer covering the substrate, the intermediate layer, the high-temperature superconducting layer, and the protective layer, The high-temperature superconducting layer comprises a metal portion arranged such that it is located in the center of the thickness direction of the high-temperature superconducting wire, The high-temperature superconducting wire is wound around the metal rod with the substrate-side surface facing the metal rod side and the high-temperature superconducting layer-side surface facing outwards. The metal portion has a tape-like first portion wider than the high-temperature superconducting portion and arranged along the stabilization layer that forms the end face of the high-temperature superconducting portion on the high-temperature superconducting layer side, and a tape-like second portion wider than the high-temperature superconducting portion and arranged along the stabilization layer that forms the end face of the high-temperature superconducting portion on the substrate side. A high-temperature superconducting conductor characterized in that the portions of the first portion and the second portion that protrude from the high-temperature superconducting portion and the stabilizing layer that forms the lateral end face in the stacking direction of the high-temperature superconducting portion are joined via a brazed joint.

3. A cylindrical metal rod and a tape-shaped high-temperature superconducting wire material spirally wrapped around the metal rod, The aforementioned high-temperature superconducting wire is A high-temperature superconducting portion having a tape-shaped substrate, a high-temperature superconducting layer formed on one side of the substrate via an intermediate layer, a protective layer formed on one side of the high-temperature superconducting layer, and a stabilizing layer covering the substrate, the intermediate layer, the high-temperature superconducting layer, and the protective layer, The high-temperature superconducting layer comprises a metal portion arranged such that it is located in the center of the thickness direction of the high-temperature superconducting wire, The high-temperature superconducting wire is wound around the metal rod with the substrate-side surface facing the metal rod side and the high-temperature superconducting layer-side surface facing outwards. The metal portion has a first portion wider than the high-temperature superconducting portion and arranged along the stabilizing layer that forms the end face of the high-temperature superconducting portion on the high-temperature superconducting layer side, a second portion wider than the high-temperature superconducting portion and arranged along the stabilizing layer that forms the end face of the high-temperature superconducting portion on the substrate side, and a third portion connecting one end of each of the first portion and the second portion. The high-temperature superconducting section is located within a space enclosed on three sides by the first, second, and third sections. A high-temperature superconducting conductor characterized in that the portions of the first portion and the second portion that protrude from the high-temperature superconducting portion and the stabilizing layer that forms the lateral end face in the stacking direction of the high-temperature superconducting portion are joined via a brazed joint.

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