JPH10162663A - Aluminum stabilized superconductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the conductivity characteristic, heat conductivity, and mechanical strength in the extremely low-temperature region by compositely integrating a reinforcing conductive material on the outer peripheral side of the high-purity aluminum coating layer of an aluminum stabilized superconductor. SOLUTION: Seven NbTi filaments serving as superconductor strands 1 are prepared, they are firmly twisted to increase the current capacity, and an aluminum stabilized superconductor twisted wire is manufactured. High-purity aluminum serving as a stabilized conductive material 2 is extrusion-coated on the outer periphery of the twisted wire to manufacture an aluminum stabilized superconductor. A copper pipe made of a half-annealed copper material (1/2H-Cu) is prepared as a reinforcing conductive material 3. The aluminum stabilized superconductor is inserted into the prepared copper pipe of the conductive material 3, the aluminum stabilized superconductor inserted copper pipe is drawn to form an aluminum stabilized superconductor having the size of vertically 1 9mm and horizontally 19mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum stabilized superconductor.

[0002]

2. Description of the Related Art In recent years, progress in superconducting technology has been remarkable.

[0003] As such superconducting applied equipment, there are a fusion device capable of generating an extremely high temperature of several thousand degrees and an energy storage facility capable of storing enormous energy. Since these fusion devices and energy storage facilities have extremely large electric capacities, the magnet coils used for them also have high magnetic fields and large capacities.

[0004] In a superconducting conductor used for such a magnet coil having a high magnetic field and a large capacity, it is customary to compound a large amount of a stabilizing conductive material in consideration of electrical stability when the superconducting state is broken. is there.

Conventionally, copper has been mainly used as such a stabilizing conductive material. However, in recent years, high-purity conductive and thermal conductive properties in a cryogenic region where superconductivity occurs are superior to copper. The use of aluminum is increasing.

In general, as a method of combining a superconducting conductor and high-purity aluminum, first, a plurality of superconducting conductor strands are twisted to form a superconducting conductor stranded wire, and then the superconducting conductor stranded wire obtained here is obtained. A method of extruding and coating high-purity aluminum on the outer periphery of a steel sheet is often used.

[0007] Since the magnet coil used in these nuclear fusion devices and energy storage facilities has a high magnetic field and a large capacity as described above, the electromagnetic force generated is also strong. For this reason, magnet coils used in nuclear fusion devices, energy storage facilities, and the like are required to maintain mechanical strength that can withstand a strong electromagnetic force. However, aluminum-stabilized superconductors, which are made by extruding and coating high-purity aluminum on the outer periphery of the stranded superconducting conductor, use a fusion device or energy device that produces a strong electromagnetic force due to the mechanical weakness of the coated high-purity aluminum. When used as a magnet coil in a storage facility, there was a concern that the magnet coil itself would be deformed.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and an object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide an electric conductivity and a thermal conductivity in a cryogenic temperature region. An object of the present invention is to provide an aluminum-stabilized superconductor having excellent conductivity characteristics and excellent mechanical strength characteristics.

[0009]

SUMMARY OF THE INVENTION The gist of the present invention is to provide an aluminum-stabilized superconducting conductor in which a superconducting stranded wire obtained by twisting a plurality of superconducting conductor wires is coated with high-purity aluminum. An aluminum-stabilized superconducting conductor characterized in that a reinforcing conductive material is integrated and integrated on the outer peripheral side of a high-purity aluminum coating layer.

In the present invention, the superconducting conductor strand is N
bTi, Nb ₃ Sn, (NbTi) ₃ Sn and the like.

In the present invention, the reinforcing conductive material is copper, copper alloy, aluminum alloy, Cr, Ni, SUS or the like.

Examples of the copper alloy include an Ag-based copper alloy, a Cr-based copper alloy, and a Ni-based copper alloy.

As a method for coating the reinforcing conductive material, there are a co-pulling method, a soldering method, a roll forming method and the like.

[0014]

Next, an embodiment of the aluminum-stabilized superconductor of the present invention will be described.

(Comparative Example 1) First, seven NbTi filaments each having a diameter of φ1.25 mm, which are superconducting conductor strands, are prepared, twisted in order to increase the current capacity, and then firmly formed. Produced an aluminum-stabilized superconducting conductor stranded wire.

Next, a high-purity aluminum, which is a stabilizing conductive material, is extruded and coated on the outer periphery of the stranded aluminum-stabilized superconducting conductor thus obtained, so that the dimensions are 14.4 mm × 1.
A 4.4 mm aluminum-stabilized superconductor of Comparative Example 1 was obtained.

FIG. 2 is a sectional view of the aluminum-stabilized superconductor of Comparative Example 1 thus obtained.

In FIG. 2, 1 is a superconducting conductor wire N
The bTi filament 2 is a high-purity aluminum coating layer of a stabilized conductive material.

The aluminum-stabilized superconducting conductor of Comparative Example 1 has a low mechanical strength. As a result, when used as a magnetic coil for a nuclear fusion device or an energy storage facility in which a strong electromagnetic force is generated, the magnet coil itself may be deformed. There was no practical use.

Example 1 In the same manner as in the method for manufacturing an aluminum-stabilized superconducting conductor of Comparative Example 1, first, seven NbTi filaments having an outer diameter of φ1.25 mm, which are superconducting wires, were prepared. Was twisted in order to increase the current capacity, and then firmly molded to produce a stranded aluminum-stabilized superconducting conductor.

Next, the outer periphery of the stranded aluminum-stabilized superconducting conductor thus obtained is extruded and coated with high-purity aluminum, which is a stabilizing conductive material, to thereby obtain an aluminum having dimensions of 14.4 mm (length) × 14.4 mm (width). A stabilized superconductor was obtained.

Next, as a reinforcing conductive material, the size or length is 25.0.
mm x width 25.0mm x thickness 2.3mm, Vickers hardness 1
A copper tube made of 00 semi-dull copper material (1 / 2H-Cu) is prepared.

Next, the aluminum-stabilized superconducting conductor having the dimensions obtained above of 14.4 mm × 14.4 mm is inserted into the copper tube of the reinforcing conductive material prepared here, and then the aluminum stabilization is performed. The superconducting conductor inserted copper tube is co-pulled, and the dimension is 1
The aluminum-stabilized superconductor of Example 1 having a size of 9.0 mm × 19.0 mm in width was obtained.

FIG. 1 is a sectional view showing the aluminum-stabilized superconductor of Example 1 thus obtained.

In FIG. 1, reference numeral 1 denotes a superconducting conductor strand N
bTi filament, 2 is a high-purity aluminum coating layer of a stabilized conductive material, and 3 is a copper coating layer of a reinforcing conductive material.

(Example 2) An aluminum-stabilized superconductor of Example 2 was obtained in the same manner as in Example 1 except that an Ag-based copper alloy was used as a reinforcing conductive material.

Example 3 An aluminum-stabilized superconductor of Example 3 was obtained in the same manner as in Example 1 except that a Cr-based copper alloy was used as a reinforcing conductive material.

Example 4 An aluminum-stabilized superconductor of Example 4 was obtained in the same manner as in Example 1 except that a Ni-based copper alloy was used as a reinforcing conductive material.

Example 5 An aluminum-stabilized superconductor of Example 5 was obtained in the same manner as in Example 1 except that SUS was used as the reinforcing conductive material.

(Test Results) Next, the aluminum-stabilized superconductor of Comparative Example 1 and the aluminum-stabilized superconductors of Examples 1 to 5 were respectively subjected to electrical conductivity characteristics, thermal conductivity characteristics,
The mechanical strength (tensile strength) was tested according to JIS.

Table 1 shows the evaluation results of these characteristic tests.

[0032]

[Table 1]

As can be seen from Table 1, the aluminum-stabilized superconducting conductor of Comparative Example 1 has excellent electrical conductivity and thermal conductivity, but has poor mechanical strength.

On the other hand, Embodiments 1 to 5 of the present invention
The aluminum-stabilized superconducting conductor has excellent electrical conductivity, thermal conductivity, and mechanical strength.

[0035]

The aluminum-stabilized superconducting conductor of the present invention has excellent electrical conductivity, thermal conductivity and mechanical strength, and is industrially useful.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an aluminum-stabilized superconductor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the aluminum-stabilized superconductor of Comparative Example 1.

[Explanation of symbols]

 1 superconducting conductor strand 2 stabilizing conductive material 3 reinforcing conductive material

Claims (3)

[Claims] 1. An aluminum stabilized superconducting conductor comprising a superconducting conductor stranded wire obtained by twisting a plurality of superconducting conductor wires and coated with high-purity aluminum, wherein a reinforcing conductive material is integrally formed on the outer peripheral side of the aluminum coating layer. An aluminum-stabilized superconducting conductor, characterized in that it is made into a superconductor. 2. The superconducting conductor strand is composed of NbTi, Nb ₃ Sn,
(NbTi) ₃ Aluminum stabilized superconductor according to claim 1, characterized in that the one metal-based superconducting conductor strands selected from among Sn. 3. The reinforcing conductive material is copper, copper alloy, aluminum alloy, C
2. The aluminum-stabilized superconductor according to claim 1, wherein the superconductor is one selected from the group consisting of r, Ni, and SUS.