JP5426231B2 - High temperature superconducting wire and superconducting coil with release material - Google Patents

Description

  The present invention relates to a high-temperature superconducting wire with a release material and a superconducting coil.

  With the improvement of superconducting technology, for example, superconducting applications such as a magnetic resonance imaging diagnostic apparatus (MRI), a superconducting magnetic energy storage apparatus (SMES), and a single crystal pulling apparatus have been put into practical use. These superconducting application devices incorporate a superconducting coil formed by winding a superconducting wire. The superconducting coil is generally impregnated with resin.

  In recent years, a superconducting coil using a high-temperature superconducting wire excellent in critical current characteristics in a high magnetic field has been developed. As this high-temperature superconducting wire, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2007-280710) discloses a thin film superconducting wire having a multilayer structure having a tape-shaped metal substrate, an intermediate layer, a superconducting layer, and a protective metal layer. Yes.

JP 2007-280710 A

  However, when a superconducting coil is produced using the high-temperature superconducting wire disclosed in Patent Document 1, a peeling force acts between the turns of the high-temperature superconducting wire during cooling in the manufacturing process, resulting in delamination or high-temperature superconductivity. Cracks may occur in the wire. This delamination or crack is caused by the difference in thermal shrinkage between the impregnated resin and the high-temperature superconducting wire. For this reason, the obtained superconducting coil has a problem that stable superconducting characteristics may not be obtained due to delamination and cracks.

  The present invention has been made in view of the above circumstances, and a high temperature superconducting wire with a release material capable of sufficiently reducing the peeling force acting on the high temperature superconducting wire and obtaining stable superconducting properties, and the high temperature superconducting wire. An object is to provide a superconducting coil used.

  The present invention provides a high-temperature superconducting wire that can provide stable superconducting properties by sufficiently reducing the peeling force acting on the high-temperature superconducting wire when a release layer is formed on at least a part of the surface of the tape-shaped high-temperature superconducting wire. It was completed by finding that

Releasing material with high-temperature superconducting wire according to the present invention is to solve the above problems, a high-temperature superconducting wire releasing material layer is formed on the front surface of the tape-shaped high-temperature superconducting wire, the hot The superconducting wire includes a tape-shaped metal substrate, an intermediate layer formed on the surface of the metal substrate, a superconducting layer formed on the surface of the intermediate layer and made of a high-temperature superconducting material, and a protective metal layer formed on the surface of the superconducting layer. The release material layer is formed on only one surface of the surfaces in the thickness direction of the high-temperature superconducting wire .

  Moreover, the superconducting coil according to the present invention solves the above-mentioned problems, and is characterized in that the high-temperature superconducting wire with a release material is used.

  According to the high-temperature superconducting wire with the release material and the superconducting coil according to the present invention, the peeling force acting on the high-temperature superconducting wire is sufficiently reduced, and stable superconducting characteristics can be obtained.

Sectional drawing of the high temperature superconducting wire with a mold release material of 1st Embodiment of this invention. Sectional drawing of the high temperature superconducting wire used for the high temperature superconducting wire with a release material shown in FIG. Sectional drawing of the high temperature superconducting wire with a mold release material of 2nd Embodiment of this invention. Sectional drawing of the high temperature superconducting wire with a mold release material of 3rd Embodiment of this invention. Sectional drawing of the high temperature superconducting wire with a mold release material of 4th Embodiment of this invention. It is a figure which shows the superconducting coil of this invention, (a) is a perspective view of the pancake-shaped superconducting coil which has a space in the axial direction center, (b) is an expansion of the winding middle part of the superconducting coil shown to (a). Sectional drawing. It is a figure which shows the superconducting coil of this invention, (a) is a perspective view of the pancake-shaped superconducting coil which has space in the axial direction center, (b) is an expanded cross section of the winding start part of the superconducting coil shown to (a) Figure. It is a figure which shows the superconducting coil of this invention, (a) is a perspective view of the pancake-shaped superconducting coil which has a space in an axial center, (b) is an expanded cross section of the winding end part of the superconducting coil shown to (a) Figure. It is a figure which shows the conventional superconducting coil, (a) is a perspective view of the pancake-shaped superconducting coil which has a space in the axial direction center, (b) is an expanded cross section of the winding middle part of the superconducting coil shown in (a) Figure.

<High-temperature superconducting wire with release material>
A high temperature superconducting wire with a release material according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a cross-sectional view of a first embodiment of a high temperature superconducting wire with a release material of the present invention. FIG. 2 is a cross-sectional view of a high-temperature superconducting wire used in the high-temperature superconducting wire with a release material shown in FIG.

  As shown in FIG. 1, in the high temperature superconducting wire 1 with a release material, a release material layer 20 is formed on the entire surface of the tape-shaped high temperature superconducting wire 10. The high temperature superconducting wire 1 with a release material has a tape-like appearance.

  As shown in FIG. 2, the high-temperature superconducting wire 10 has a structure in which the entire surface of a multilayer structure 15 that is a laminated body of tape-like materials is covered with a stabilizing metal layer 17. This high-temperature superconducting wire 10 is generally called a Coated Conductor.

  The multilayer structure 15 includes a tape-shaped metal substrate 11, an intermediate layer 12 formed on the surface of the metal substrate 11, a superconducting layer 13 formed on the surface of the intermediate layer 12 and made of a high-temperature superconducting material, and the superconducting layer 15. And a protective metal layer 14 formed on the surface of the layer 13.

  As the metal substrate 11, for example, a tape made of nickel alloy such as Hastelloy (registered trademark), stainless steel or the like is used.

  The intermediate layer 12 is a layer that promotes crystal growth of the oxide of the superconducting layer 13 formed on the surface. As the intermediate layer 12, for example, a polycrystalline thin film made of cerium oxide, magnesium oxide, yttrium oxide or the like is used.

  The superconducting layer 13 is a layer that exhibits high-temperature superconductivity. As the superconducting layer 13, for example, a layer mainly composed of a rare earth oxide such as yttrium or a high-temperature superconducting material such as Re123 is used.

  The protective metal layer 14 is a layer that protects the superconducting layer 13. As the protective metal layer 14, for example, a layer made of silver, gold, or an alloy thereof is used. The high-temperature superconducting material of the superconducting layer 13 is generally an active material that easily reacts with other metals. Therefore, when it is brought into direct contact with a metal other than gold, silver, or an alloy thereof, a reaction occurs and the superconducting layer 13 There is a risk of performance degradation. The protective metal layer 14 prevents performance degradation of the superconducting layer 13.

  Thus, the high-temperature superconducting wire 10 has a structure in which the multilayer structure 15 is asymmetric with respect to the stacking direction. Hereinafter, of the two surfaces in the stacking direction of the high-temperature superconducting wire 10, the surface on the metal substrate 11 side is referred to as a metal substrate side surface 51, and the surface on the superconducting layer 13 or protective metal layer 14 side is referred to as a superconducting layer side surface 52.

  As the stabilizing metal layer 17, for example, a layer made of copper, stainless steel or the like is used.

  In the release material layer 20, the adhesive force between the release material layer 20 and a cured resin such as an epoxy resin cured product is weaker than the adhesive force between the high-temperature superconducting wire 10 and the cured resin. It is the layer formed in this way.

  For example, when the superconducting coil is produced using the high-temperature superconducting wire 1 with a release material, the cured resin is formed around the width direction of the high-temperature superconducting wire 1 with the release material wound or the high-temperature superconducting wire 1 with the release material. It is a cured product of resin that is applied or impregnated between turns.

  As the release material layer 20, for example, a layer made of at least one selected from fluororesins such as Teflon (registered trademark), paraffin, grease, and silicon oil is used. When using a fluororesin, it is preferable to use a fluororesin tape. Examples of the case where the release material layer 20 is formed using two or more of the above materials include a case where the release material layer 20 has a two-layer structure of a grease layer and a silicon oil layer. .

  When the high-temperature superconducting wire 1 with a release material is wound together with a not-shown co-winding tape or the like, and the resin cured product layer is formed between the high-temperature superconducting wire 1 with a release material and the co-winding tape, A cake-like superconducting coil can be produced.

  The release material layer 20 is formed of a release material layer 20 and a cured resin layer when a tensile force is applied to peel off the turns of the high temperature superconducting wire 1 with a release material in a pancake-shaped superconducting coil. By actively separating the gaps, no tensile force is applied to the high temperature superconducting wire 10 or it is difficult to apply.

  The effect | action of the high temperature superconducting wire 1 with a mold release material is demonstrated.

  For example, when the high temperature superconducting wire 1 with a release material is wound together with a winding coil (not shown) or the like and wound, and a resin cured material layer is formed between the high temperature superconducting wire 1 with a release material and the winding tape, for example. A pancake-shaped superconducting coil can be produced.

  In this pancake-shaped superconducting coil, when a strong tensile force perpendicular to the surface of the wound high-temperature superconducting wire 1 with a release material is applied, the release material layer 20 and a resin cured material layer (not shown) Peeling occurs due to the tensile force at the interface. However, since this tensile force is consumed by peeling of the interface between the release material layer 20 and the cured resin layer, it does not substantially reach the high temperature superconducting wire 10.

  According to the high-temperature superconducting wire 1 with a release material, when a superconducting coil having a structure in which the high-temperature superconducting wire 1 with a release material comes into contact with a cured resin provided around it is produced, a multilayer structure in the high-temperature superconducting wire 10 is obtained. The high-temperature superconducting wire 1 with a release material with high reliability of the high-temperature superconducting wire 10 is obtained in which the body 15 is difficult to peel off.

  FIG. 2 shows an example of the high-temperature superconducting wire 10 having a structure in which the entire surface of the multilayer structure 15 is covered with the stabilizing metal layer 17, but the high-temperature superconducting wire 10 of the present invention is composed of the stabilizing metal layer 17. It is good also as a structure which is not provided.

[Second Embodiment]
FIG. 3 is an enlarged cross-sectional view of a second embodiment of the high temperature superconducting wire with a release material of the present invention.

  A high-temperature superconducting wire 1A with a release material shown as the second embodiment includes a release material layer 20A instead of the release material layer 20 as compared with the high-temperature superconducting wire 1 shown as the first embodiment in FIG. The difference is that a high-temperature superconducting wire 10A is provided instead of the high-temperature superconducting wire 10, and the other points are the same. For this reason, the same code | symbol is attached | subjected to the same structure by 1 A of high temperature superconducting wires with a release material, and the high temperature superconducting wire 1 with a release material, and the description about an effect | action is simplified.

  Here, the high-temperature superconducting wire 10 </ b> A means a structure obtained by removing the stabilizing metal layer 17 from the high-temperature superconducting wire 10, that is, a multilayer structure 15 of the high-temperature superconducting wire 10.

  As shown in FIG. 3, in the high-temperature superconducting wire 1 </ b> A with a release material, a release material layer 20 </ b> A is formed on the entire surface of only the superconducting layer side surface 52 among the surfaces of the tape-like high-temperature superconducting wire 10.

  The release material layer 20 </ b> A is made of the same material as the release material layer 20.

  The operation of the high-temperature superconducting wire 1A with the release material will be described.

  The high-temperature superconducting wire 1A with a release material can produce a pancake-like superconducting coil in the same manner as the high-temperature superconducting wire 1 with a release material.

  In this pancake-shaped superconducting coil, the metal substrate 11 on the metal substrate side surface 51 of the high-temperature superconducting wire 10A is directly bonded to a cured resin (not shown) provided around the high-temperature superconducting wire 1A with a release material. For this reason, when a strong tensile force perpendicular to the surface of the wound high-temperature superconducting wire 1A is applied, a strong tensile force is directly applied to the metal substrate 11, but the metal substrate 11 and the cured resin Is bonded, the metal substrate side surface 51 of the high-temperature superconducting wire 10A does not peel off. In contrast, the superconducting layer side surface 52 of the high-temperature superconducting wire 10A is peeled off at the interface between the release material layer 20A and the cured resin layer due to the tensile force.

  As described above, the tensile force applied in the direction perpendicular to the surface of the high-temperature superconducting wire 1A with the release material is consumed due to the separation of the interface between the release material layer 20A and the cured resin layer, and thus the high-temperature superconducting wire 10A. Substantially does not reach, and the laminated structure of the high-temperature superconducting wire 10A is not damaged. In particular, the superconducting layer 13 which is relatively weak against shock is disposed in the vicinity of the superconducting layer side surface 52 in the high temperature superconducting wire 10A. However, the release material layer 20A on the superconducting layer side surface 52 of the high temperature superconducting wire 10A and the resin curing are disposed. Since the interface with the physical layer is easily peeled off, the tensile force hardly reaches the superconducting layer 13 and the superconducting layer 13 is hardly damaged.

  In addition, since a member with high strength is generally used for the metal substrate 11, even if a strong tensile force is directly applied to the metal substrate 11, the laminated structure of the high-temperature superconducting wire 10A accompanying the deformation of the metal substrate 11 is not damaged.

  Further, in the high-temperature superconducting wire 1A with a release material, the metal substrate 11 and the cured resin are in direct contact with each other, so that the thermal conductivity of the superconducting coil is increased.

  According to the high-temperature superconducting wire 1A with a release material, when a superconducting coil having a structure in which a cured resin layer is provided around the high-temperature superconducting wire 1A with a release material, the high-temperature superconducting wire 1 with a release material is prepared. Compared with the case of using, it is possible to improve the resistance and heat transfer performance against the tensile force in the stacking direction of the high-temperature superconducting wire 1A with a release member, that is, the thickness direction.

[Third Embodiment]
FIG. 4 is an enlarged cross-sectional view of a third embodiment of the high-temperature superconducting wire with a release material of the present invention.

  The high temperature superconducting wire 1B with a release material shown as the third embodiment includes a release material layer 20B instead of the release material layer 20A, as compared with the high temperature superconducting wire 1A shown as the second embodiment in FIG. The points are different and the other points are the same. For this reason, the same code | symbol is attached | subjected to the same structure by the high temperature superconducting wire 1B with a mold release material, and the high temperature superconducting wire 1A with a mold release material, and the description about an effect | action is simplified.

  As shown in FIG. 4, in the high temperature superconducting wire 1B with a release material, the release material layer 20B is formed only on a part of the superconducting layer side surface 52 of the surface of the tape-like high temperature superconducting wire 10A. More specifically, the release material layer 20B is provided on the superconducting layer side surface 52 so as to have the same width as the superconducting layer 13 in the high-temperature superconducting wire 10A. Thereby, the high temperature superconducting wire 1B with a release material has a structure in which the release material layer 20B is not provided at both ends 53 and 54 in the width direction of the high temperature superconducting wire 10A, and the high temperature superconducting wire 10A is exposed. .

  The release material layer 20 </ b> B is made of the same material as the release material layer 20.

  The operation of the high temperature superconducting wire 1B with the release material will be described.

  The high temperature superconducting wire 1B with a release material can produce a pancake-like superconducting coil in the same manner as the high temperature superconducting wire 1A with a release material.

  In this pancake-shaped superconducting coil, the metal substrate 11 on the metal substrate-side surface 51 of the high-temperature superconducting wire 10A and both ends 53 and 54 in the width direction of the high-temperature superconducting wire 10A are disposed around the high-temperature superconducting wire 1B with a release material. It is directly bonded to the provided cured resin. Therefore, when a strong tensile force perpendicular to the surface of the wound high-temperature superconducting wire 1B is applied, the metal substrate 11 and the high-temperature superconducting wire 10A are directly strong at both ends 53 and 54 in the width direction. A tensile force is applied, and peeling occurs due to the tensile force at the interface between the release material layer 20B and a cured resin layer (not shown) as in the superconducting coil using the high-temperature superconducting wire 1A with a release material. The force for peeling off the interface is stronger than the case of using the high temperature superconducting wire 1A with a release material because the strong tensile force is directly applied to both end portions 53 and 54 in the width direction of the high temperature superconducting wire 10A.

  In the high-temperature superconducting wire 1B with a release material, the release material layer 20B is provided on the superconducting layer side surface 52 so as to have the same width as the superconducting layer 13 in the high-temperature superconducting wire 10A. It is difficult to reach the superconducting layer 13 and the superconducting layer 13 is hardly damaged.

  Furthermore, in the superconducting coil using the high-temperature superconducting wire 1B with a release material, the cured resin provided around the high-temperature superconducting wire 1B with a release material is bonded to both ends 53 and 54 in the width direction of the high-temperature superconducting wire 10A. Since both ends 53 and 54 are fixed by bonding, resistance to tensile force in the stacking direction of the high-temperature superconducting wire 1B with a release material, that is, in the thickness direction, compared to the superconducting coil using the high-temperature superconducting wire 1A with a release material. Power and heat transfer performance are improved.

  According to the high-temperature superconducting wire 1B with a release material, when a superconducting coil having a structure in which the high-temperature superconducting wire 1B with a release material is in contact with a cured resin provided around it is manufactured, the high-temperature superconducting wire 1A with a release material is prepared. As compared with the case of using, it is possible to improve the resistance to the tensile force in the stacking direction of the high temperature superconducting wire 1B with a release material, that is, the thickness direction, and the heat transfer performance.

[Fourth Embodiment]
FIG. 5: is an expanded sectional view of 4th Embodiment of the high temperature superconducting wire with a mold release material of this invention.

  Compared with the high temperature superconducting wire 1B shown as the third embodiment in FIG. 4, the high temperature superconducting wire 1C with a release material shown as the fourth embodiment has a heat conducting tape 4 on the metal substrate side surface 51 of the high temperature superconducting wire 10A. Is different, and the other points are the same. For this reason, the same code | symbol is attached | subjected to the same structure by 1C of high temperature superconducting wire 1C with a mold release material, and high temperature superconducting wire 1B with a mold release material, and the description about an effect | action is simplified.

  As shown in FIG. 5, in the high-temperature superconducting wire 1C with a release material, the heat conductive tape 4 having a width wider than that of the high-temperature superconducting wire 10A is fixed to the metal substrate side surface 51 out of the surface of the tape-like high-temperature superconducting wire 10A. The That is, in the high-temperature superconducting wire 1C with a release material, the release material layer 20B is not provided on both ends 53 and 54 in the width direction of the high-temperature superconducting wire 10A and the surface of the heat conductive tape 4, and the high-temperature superconducting wire 10A is exposed. doing.

  As the heat conductive tape 4, for example, a member having better heat conductivity than Hastelloy (registered trademark) which is a material of the metal substrate 11 is used. Examples of the member having good thermal conductivity include copper, stainless steel, and aluminum.

  The operation of the high-temperature superconducting wire 1C with a release material will be described.

  The high-temperature superconducting wire 1C with a release material can produce a pancake-like superconducting coil in the same manner as the high-temperature superconducting wire 1 with a release material.

  In this pancake-shaped superconducting coil, both ends 53 and 54 in the width direction of the high-temperature superconducting wire 10A and the surface of the heat conductive tape 4 are cured with a resin cured product provided around the high-temperature superconducting wire 1C with a release material. Directly glued. For this reason, when a strong tensile force perpendicular to the surface of the wound high-temperature superconducting wire 1C is applied, both ends 53 and 54 in the width direction of the high-temperature superconducting wire 10A and the heat conductive tape 4 A strong tensile force is directly applied to the surface, and separation occurs due to the tensile force at the interface between the release material layer 20B and a cured resin layer (not shown) as in the superconducting coil using the high temperature superconducting wire 1B with a release material.

  Moreover, in the superconducting coil using the high-temperature superconducting wire 1C with the release material, the heat-conducting tape 4 having good thermal conductivity is used, so that the release material is compared with the case where the high-temperature superconducting wire 1B with the release material is used. The heat transfer performance with respect to the width direction of the attached high temperature superconducting wire 1C becomes higher.

  According to the high-temperature superconducting wire 1C with a release material, when a superconducting coil having a structure in which the high-temperature superconducting wire 1C with a release material comes into contact with a cured resin provided around the high-temperature superconducting wire 1B is provided. The heat transfer performance in the width direction of the high-temperature superconducting wire 1C with a release member can be made higher than when using.

<Superconducting coil>
The superconducting coil of the present invention will be described with reference to FIGS.

  FIG. 6 is a diagram showing a superconducting coil of the present invention and a cross section thereof. Specifically, FIG. 6A is a perspective view of a pancake-shaped superconducting coil 7 having a cylindrical space in the axial center, and FIG. 6B is a winding of the superconducting coil 7 shown in FIG. It is an expanded sectional view of the middle part 79.

  In the superconducting coil 7 shown in FIG. 6A, as shown in FIG. 6B, the high-temperature superconducting wire 1B with a tape-shaped release material and the insulating tape 5 are wound together in the winding middle portion 79. And concentrically wound and fixed with a cured resin layer 6 provided around the periphery. Thereby, the superconducting coil 7 is formed in a so-called pancake shape having an outer shape having a space 95 penetrating the axial center. Although FIG. 6 shows a single pancake coil, the present invention may be a so-called double pancake coil formed in the shape of two pancakes.

  In the superconducting coil 7, a high temperature superconducting wire 10A that does not include the release material layer 20B is used at the winding start part 77 and the winding end part 78 other than the winding middle part 79. It is joined to the high-temperature superconducting wire 1B with a release material in the winding middle part 79. Therefore, in the superconducting coil 7, a structure in which the high-temperature superconducting wire 10A is electrically joined to both ends of the high-temperature superconducting wire 1B with a release material, that is, the high-temperature superconducting wire 10A—the high-temperature superconducting wire 1B with a release material—high-temperature superconductivity. A high-temperature superconducting wire joining material having a structure of the wire 10A is used.

  For example, Kapton (registered trademark) is used as the insulating tape 5.

  The cured resin layer 6 is an insulating layer made of a cured resin such as an epoxy resin. The cured resin layer 6 covers the width direction of the high-temperature superconducting wire 1B with the release material and the insulating tape 5 to form the winding side surfaces 72A and 72B, and the high-temperature superconducting wire 1B with the release material and the insulating tape. 5 in the gap in the stacking direction.

  The cured resin layer 6 maintains a coil shape formed by winding the high temperature superconducting wire bonding material or the insulating tape 5 by bonding, and also acts as a heat transfer path for guiding heat generated in the high temperature superconducting wire bonding material. To do.

  The superconducting coil 7 has an inner circumferential surface 75 whose outer shape faces the cylindrical space 95, an outer circumferential surface 76, and a pair of ring-shaped winding side surfaces 72A and 72B which are a pair of end surfaces in the axial direction. It is to prepare. Winding side surface portions 72A and 72B are planar portions formed by covering aggregates of both ends in the width direction such as a wound high-temperature superconducting wire bonding material and insulating tape 5 with a resin cured material layer, etc. It is.

  In the superconducting coil 7, the high-temperature superconducting wire joining material is usually wound so as to start winding from the inner peripheral surface 75 side and finish winding on the outer peripheral surface 76. Hereinafter, the first turn portion at which the high temperature superconducting wire joining material starts to be wound is referred to as a winding start portion 77. Further, the last one turn portion where the high-temperature superconducting wire joining material is wound is referred to as a winding end portion 78. Further, a portion of the wound high-temperature superconducting wire bonding material excluding the winding start portion and the winding end portion is referred to as a winding intermediate portion 79. Further, a portion including the winding start portion 77, the winding intermediate portion 79 and the winding end portion 78 is referred to as a winding portion 71.

  In the superconducting coil 7, the part of the high temperature superconducting wire 1 </ b> B with a release material is used as the winding intermediate part 79, and the part of the high temperature superconducting wire 10 </ b> A is used as the winding start part 77 and the winding end part 78. It is used.

  FIG. 7 is a diagram showing the superconducting coil shown in FIG. 6 and its cross section. Specifically, FIG. 7A is a perspective view showing the same superconducting coil 7 as the superconducting coil shown in FIG. 6, and FIG. 7B is an enlarged view of the winding start portion 77 of the superconducting coil 7 shown in FIG. It is sectional drawing.

  As shown in FIG. 7B, unlike the winding intermediate portion 79 shown in FIG. 6, the high temperature superconducting wire 10A in which the release material layer 20B is not provided is used in the winding start portion 77.

  The high temperature superconducting wire 10A constituting the winding start portion 77 is arranged such that the superconducting layer side surface 52 faces the inner peripheral surface 75 side.

  The arrangement in which the superconducting layer side surface 52 of the high-temperature superconducting wire 10A in the winding start portion 77 faces the inner peripheral surface 75 is arranged in the middle winding portion 79 shown in FIG. 6 (b) or the winding end portion shown in FIG. 8 (b). In 78, the arrangement in which the superconducting layer side surface 52 of the high temperature superconducting wire 10A faces the outer peripheral surface 76 and the arrangement of the high temperature superconducting wire 10A are reversed.

  Further, at the winding start portion 77, the high temperature superconducting wire 10 </ b> A is disposed so as to be located closest to the inner peripheral surface 75, and the high temperature superconducting wire 10 </ b> A is exposed on the inner peripheral surface 75.

  FIG. 8 is a diagram showing the superconducting coil shown in FIG. 6 and its cross section. Specifically, FIG. 8A is a perspective view showing the same superconducting coil 7 as the superconducting coil shown in FIG. 6, and FIG. 8B is an enlarged view of the winding end portion 78 of the superconducting coil 7 shown in FIG. It is sectional drawing.

  As shown in FIG. 8B, unlike the winding intermediate portion 79 shown in FIG. 6, the high temperature superconducting wire 10A in which the release material layer 20B is not provided is used at the winding end portion 78.

  At the winding end portion 78, the high temperature superconducting wire 10 </ b> A is disposed so as to be located closest to the outer peripheral surface 76, and the high temperature superconducting wire 10 </ b> A is exposed on the outer peripheral surface 76.

  Thus, in the superconducting coil 7, the release material layer 20B is not provided at the winding start portion 77 and the winding end portion 78, and the superconducting layer side surface 52 of the high-temperature superconducting wire 10A has the inner peripheral surface 75 and the outer peripheral surface 76. It has a structure exposed to.

  The high-temperature superconducting wire joining material used for the superconducting coil 7 is typically used for the high-temperature superconducting wire 10A for the winding start portion 77, the high-temperature superconducting wire 1B with a release material for the winding middle portion 79, and the winding end portion 78. The high-temperature superconducting wire 10A is prepared as a separate member, and these members are manufactured by electrical connection before winding, during winding or after winding.

When electrically connecting the high-temperature superconducting wire 10A for the winding start portion 77 and the high-temperature superconducting wire 1B with a release material for the winding intermediate portion 79, the superconducting layer side surface 52 of the high-temperature superconducting wire 10A is inside. It connects so that it may become reverse direction to the surrounding surface 75 side and the outer peripheral surface 76 side.

  According to the superconducting coil 7, since the high temperature superconducting wire 1B with a release material shown as the third embodiment in FIG. 4 is used as a part of the high temperature superconducting wire joining material, the high temperature superconducting wire 1B with a release material is used. The same effect is produced when a pancake-shaped superconducting coil is produced.

  Further, according to the superconducting coil 7, the high temperature superconducting wire 10A having no release material layer is used for the winding start portion 77 and the winding end portion 78, and the superconducting layer side surface 52 of the high temperature superconducting wire 10A is a cured resin layer. 6, the high-temperature superconducting wire 10 </ b> A receives a tensile force from the cured resin layer 6, and the superconducting layer 13 in the high-temperature superconducting wire 10 </ b> A is less likely to be damaged.

  Furthermore, according to the superconducting coil 7, since the high temperature superconducting wire 10A having no release material layer is used for the winding start portion 77 and the winding end portion 78, a decrease in heat transfer performance due to the formation of the release material layer is small.

  FIG. 9 is a diagram showing a conventional superconducting coil and its cross section. Specifically, FIG. 9A is a perspective view of a conventional pancake-shaped superconducting coil 8 having a cylindrical space at the center in the axial direction, and FIG. 9B is a conventional superconducting coil shown in FIG. 8 is an enlarged cross-sectional view of a winding middle part 8 of FIG.

  As shown in FIGS. 9 (a) and 9 (b), the conventional superconducting coil 8 has a tape-like high-temperature superconducting wire 10A on which a release material layer is not provided and an insulating tape 5 that are wound together to form a concentric circle. It is wound and fixed by a cured resin layer 6 provided around it, and is formed in a so-called pancake shape having a space 95 penetrating the center in the axial direction.

  Since the conventional superconducting coil 8 is not provided with a releasing material layer, when a strong tensile force perpendicular to the surface of the wound high-temperature superconducting wire 10A is applied, a multilayer (not shown) in the high-temperature superconducting wire 10A is applied. The structure may be damaged.

  On the other hand, according to the superconducting coil 7, since the high-temperature superconducting wire 1B with a release material shown as the third embodiment in FIG. 4 is used as a part of the high-temperature superconducting wire bonding material, the wound release Even if a strong tensile force perpendicular to the surface of the high-temperature superconducting wire 1B with the material is applied, the multilayer structure 15 in the high-temperature superconducting wire 10A of the high-temperature superconducting wire 1B with the release material is hardly damaged.

  In addition, although the superconducting coil 7 shown in FIGS. 6-8 is an example using the high temperature superconducting wire 1B with a release material as a high temperature superconducting wire with a release material, the superconducting coil of the present invention is a high temperature superconducting wire with a release material. Instead of 1B, a high temperature superconducting wire 1, 1A or 1C with a release material may be used. The obtained superconducting coil has the characteristics of the high-temperature superconducting wire with a release material used.

  Moreover, although the normal pancake coil was shown as an example in the embodiment of FIGS. 6 to 8, it can be similarly applied to a racetrack-shaped pancake coil.

1, 1A, 1B, 1C High-temperature superconducting wire with release material 10, 10A High-temperature superconducting wire 11 Metal substrate 12 Intermediate layer 13 Superconducting layer 14 Protective metal layer 15 Multilayer structure 17 Stabilized metal layers 20, 20A, 20B Release material Layer 4 Thermal conductive tape 5 Insulating tape 51 Metal substrate side surface 52 Superconducting layer side surface 53, 54 End 6 in the width direction of high-temperature superconducting wire 10 Resin cured material layer 7 Superconducting coil 71 Winding part 72A, 72B Winding side part 75 Inner peripheral surface 76 Outer peripheral surface 77 Winding start portion 78 Winding end portion 79 Winding intermediate portion 8 Conventional superconducting coil 81 Winding side surface portion 810 of conventional superconducting coil Conventional winding surface portion 85 of conventional superconducting coil Coil inner peripheral surface 86 Conventional superconducting coil outer peripheral surface 87 Conventional superconducting coil winding start portion 88 Conventional superconducting coil winding end portion 89 Conventional superconducting surface Coil winding middle part 95 cylindrical space

Claims (9)

A high-temperature superconducting wire releasing material layer is formed on the front surface of the tape-shaped high-temperature superconducting wire,
The high-temperature superconducting wire includes a tape-shaped metal substrate, an intermediate layer formed on the surface of the metal substrate, a superconducting layer formed on the surface of the intermediate layer and made of a high-temperature superconducting material, and a protection formed on the surface of the superconducting layer. A multilayer structure having a metal layer,
The release material layer is formed on only one of the surfaces in the thickness direction of the high-temperature superconducting wire. 2. The high-temperature superconducting wire with a release material according to claim 1 , wherein the one surface is a surface on the protective metal layer side . 2. The high-temperature superconducting wire with a release material according to claim 1, wherein the release material layer is not provided at both ends in the width direction of the high-temperature superconducting wire, and the high-temperature superconducting wire is exposed. 2. The high-temperature superconducting wire with a release material according to claim 1, wherein the release material layer is made of at least one selected from a fluororesin, paraffin, grease and silicone oil. A heat conducting tape having a width wider than that of the high temperature superconducting wire is fixed to at least one surface of the high temperature superconducting wire, and both end portions in the width direction of the high temperature superconducting wire and the heat conducting tape are formed by the release material layer. The high-temperature superconducting wire with a release material according to claim 1, wherein the high-temperature superconducting wire and the heat conductive tape are exposed. 6. The high-temperature superconducting wire with a release material according to claim 5 , wherein the heat conductive tape is fixed to the surface of the high-temperature superconducting wire on the metal substrate side. A superconducting coil comprising the high-temperature superconducting wire with a release material according to any one of claims 1 to 6. The superconducting coil according to claim 7, wherein the superconducting coil is formed in a pancake shape having a space penetrating the axial center by winding the high-temperature superconducting wire with a release member. At least one of the winding start portion of the high temperature superconducting wire with the release material in the vicinity of the inner peripheral surface facing the space and the winding end portion of the high temperature superconducting wire with the release material in the vicinity of the outer peripheral surface, 9. A superconducting coil according to claim 8, wherein a turn formed by winding a high temperature superconducting wire not provided with a release material layer is connected to a turn made of the high temperature superconducting wire with the release material.

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