JPH0644833A - Ceramics superconductive conductor - Google Patents

Abstract

PURPOSE:To improve working efficiency in manufacturing and prevent the degradation in the superconductive property of a superconductor in terms of combined wire materials without deforming the combined wire materials. CONSTITUTION:Combined tape wire materials 3 in combination of ceramics superconductors 1 and metal materials 2 are laminated in plurals to form laminated blocks 4, which are arranged in desired numbers on the outer periphery of a former 5. The laminated blocks 4 are shaped sectionally trapezoidal in such a manner that the combined tape wire materials 3 different in width are made gradually wider as they are laminated up.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The ceramic superconducting conductor of the present invention can be used for electric power transportation such as electric power cables.

[0002]

2. Description of the Related Art In recent years, Y--Ba--Cu--O system, Bi--
(Pb) -Sr-Ca-Cu-O system, Tl-Ba-Ca
Ceramic superconductors having Tc exceeding the liquid nitrogen temperature are known, such as the —Cu—O system. In order to apply such a ceramics superconductor to, for example, a cable or the like, a technique for converting the wire into a wire is being developed. Generally, a metal sheath method is used as a method for forming a wire. This is a billet made by filling a ceramic material that can be a superconductor into a metal material (usually a metal pipe), and processing this to reduce the cross-section to finish into a composite wire with the desired shape and dimensions.
After that, heat treatment is performed to obtain a ceramics superconducting conductor.

There are various types of composite wire rods having a cross-sectional shape such as a round shape, an elliptical shape, a square shape, and a tape shape. Also, in the tape-shaped one, the ceramic superconductor 2 is embedded in the metal material 1 in a single core as shown in FIG. 5 (a), and in the metal material 1 as shown in FIG. 5 (b). A large number of ceramic superconductors 2 are embedded intermittently (multi-core wire),
As shown in FIG. 5 (c), a multi-core embedded ceramic superconductor 2 in a metal material 1 (multilayer wire),
As shown in (d), a ceramics superconductor is spirally embedded inside the metal material 1. Furthermore, although not shown, the ceramics superconductor is concentrically arranged inside the metal material. There are various types, and various prototypes have been studied.

As the above-mentioned cross-section reduction processing, conventional plastic working methods such as extrusion, rolling, swaging and drawing are applied as they are according to the shape of the obtained wire.

The material of the metal material 1 is thermal conductivity,
Materials with excellent electrical conductivity, such as Ag, Ag alloys, C
u, Cu alloy, etc. can be applied, but in terms of oxygen permeability A
In many cases, g and Ag alloys are used.

The use of such a composite wire as a conductor for electric power transportation such as a cable has been studied. Figure 4
What is shown in (a) is an example of a ceramics superconducting conductor used for electric power transportation. As shown in FIG. 5 (a), a plurality of tape-shaped composite wire rods 3 are formed by combining a ceramics superconductor 1 and a metal material 2 on the outer periphery of a former 5 such as a metal pipe or a metal round bar. It is a spiral multi-layer winding.

[0007]

In the ceramic superconducting conductor shown in FIG. 4 (a), the composite wire 3 is spirally wound around the outer periphery of the former 5, and then the composite wire 3 is similarly formed thereon.
Since it is wound in a multi-layered manner, the workability is deteriorated when the number of layers is increased. In addition, since the outer composite wire 3 and the inner composite wire 3 are not always located at the same position in order to form a multilayer structure, they may be displaced as shown in FIG. 4B, and as a result, the outer composite wire 3 is Deformed and Ic
There was also a drawback that the characteristics deteriorated.

The object of the present invention is to improve workability during manufacturing,
The above-mentioned deformation of the composite wire does not occur, the superconducting property of the superconductor in the composite wire does not deteriorate, and the high Ic
It is to provide a ceramics superconducting conductor having characteristics.

[0009]

A ceramics superconducting conductor according to claim 1 of the present invention is a tape-shaped composite wire having the same width in which a ceramics superconductor 1 and a metal material 2 are compounded as shown in FIG. 3 (a). 3 is laminated to form a laminated block 4, and the laminated block 4 is arranged around the desired number of formers 5 as shown in FIG.

In the present invention, the ceramic superconducting conductor of claim 2 is a tape-shaped composite wire 3 which is a composite of a ceramic superconducting conductor 1 and a metal material 2 and has different widths, as shown in FIG. 3 (b). A plurality of sheets are laminated so that the width becomes wider in the upper direction to form a laminated block 4 having a trapezoidal cross section, and the laminated block 4 is arranged around the desired number of formers 5 as shown in FIG. is there.

In FIGS. 1 and 2 (a) and 2 (b) showing an example of the ceramics superconducting conductor of the present invention, 3 is a tape-shaped composite wire rod in which a metal material 1 and a ceramics superconductor 2 are compounded, and 4 is a tape shape thereof. A laminated block 5 in which a plurality of composite wire rods 3 are laminated is a former in which the laminated block 4 is arranged.

The laminated block 4 shown in FIG. 3 (a) is used for the ceramics superconducting conductor of FIG. 1, and is a tape-shaped composite wire 3 in which the ceramics superconductor 1 and the metal material 2 are combined. , A large number of sheets having the same width are prepared and laminated to form a square sectional shape.

The laminated block 4 shown in FIG. 3 (b) is used for the ceramics superconducting conductor of FIG. 2, and is a tape-shaped composite wire 3 in which the ceramics superconductor 1 and the metal material 2 are combined. A large number of pieces having different widths are prepared, and those having a wide width are sequentially stacked on the top surface to form a trapezoidal cross section.

The cross-sectional shape of the tape-shaped composite wire 3 used here is not limited, and for example, the single-core type shown in FIG. 5 (a), the multi-core type shown in FIG. 5 (b), Alternatively, FIG.
Any of the multi-layered ones shown in (c) may be used. Although the width and thickness of the tape-shaped composite wire 3 can be variously selected according to the outer diameter and material of the former 5, the bending strain applied to the ceramic superconductor 1 in the tape-shaped composite 3 is preferably as small as possible. . Further, there is no limitation on the number of tape-shaped composite wire rods 3 per laminated block or the number of laminated blocks 4 arranged on the outer periphery of the former 5 (the number of blocks). It may be determined in consideration of the outer diameter and the like.

The material of the former 5 is not particularly limited, but, for example, Cu. Metal materials such as SUS, Al, Fe,
Alternatively, plastics such as polyethylene, nylon, Teflon and polyester can be applied. The structure and shape of the former 5 may be, in addition to a normal pipe, for example, a pipe which is corrugated or a tape-shaped material which is spirally wound into a cylindrical shape. When the tape-shaped material is wound in a spiral shape, not only the former 5 has flexibility, but also flexibility is imparted to the entire ceramic superconductor obtained by disposing the laminated block 4 on the outer periphery thereof. Particularly suitable for long ceramic superconductors.

Next, an example of the method for producing the ceramic superconducting conductor of the present invention will be described. First, a tape-shaped composite wire 3 made of a ceramic material that can be a superconductor and a metal is prepared. As the method, an ordinary metal sheath method can be applied as it is. Specifically, a ceramic raw material that can be a superconductor is filled into a metal pipe to form a billet, which is plastically worked to finish the composite wire rod 3 having a desired shape and size. For example, extrusion, swaging, rolling, drawing and the like can be applied. The tape-shaped composite wire 3 may have a single-core tape shape or a multilayer wire, for example. The tape-shaped composite wire 3 may be heat-treated to make the ceramic raw material into a superconducting conductor, but as will be described later, the tape-shaped composite wire 3 may be laminated into a laminated block 4 and then heat-treated. It is possible.

A desired number of the tape-shaped composite wire rods 3 are laminated to form a laminated block 4 as shown in FIGS. 3 (a) and 3 (b). In this case, it is preferable to solder and fix, for example, one side surface 8 of both side surfaces 8 and 9 (FIG. 3) in the width direction of the laminated block 4, in which case the laminated tape-shaped composite wire 3 Is less likely to be displaced, and the laminated block 4 is less likely to lose its shape. The soldering of the side surface 9 is performed by pressing and winding the tape 6 described later at a coarse pitch,
You may carry out from the winding pitch of the tape 6.

As another method of forming the laminated block 4, for example, long tape-shaped composite wire rods 3 having different widths are heat-treated and wound on a bobbin or the like, and a plurality of the tape-shaped composite wire rods 3 are drawn out at the same time and stacked and bundled. You may.

Laminated block 4 obtained as described above
Prepare multiple books. These are spirally wound around the outer periphery of the former 5. Various winding pitches can be selected.
Further, the other side surface 9 of the wound laminated block 4 which is not soldered is fixed by soldering. The laminated block 4 may be linearly arranged on the outer periphery of the former 5, but it is preferable to spirally wind the laminated block 4 because flexibility is imparted to the whole. Further, it is desirable that the laminated block 4 be curved in the tape width direction and be arranged on the outer periphery of the former 5 so that the surface of the former 5 and the tape-shaped composite wire 3 of the lowermost layer of the laminated block 4 contact each other.

Further, if necessary, the tape 6 is pressed and wound around the outer periphery of the laminated block 4 arranged on the outer periphery of the former 5 to fix the laminated block 4, and as shown in FIGS. 1 and 2B. A ceramic superconducting conductor is obtained.

[0021]

In the ceramic superconducting conductor according to claim 1 of the present invention, a plurality of laminated blocks 4 in which the tape-shaped composite wires 3 having the same width are laminated in advance are arranged on the outer periphery of the former 5, so that the inside and outside tapes are formed. The composite wire rod 3 is not displaced, so that the outer composite wire rod 3 is not deformed.

In the ceramic superconducting conductor according to claim 2 of the present invention, since the cross-sectional shape of the laminated block 4 is a trapezoid whose width is wide upward, the laminated block 4 is arranged on the outer periphery of the round bar-shaped or cylindrical former 5. Then, the side surfaces of the adjacent laminated blocks 4 come into contact with each other, so that the tape-shaped composite wire 3 is less likely to be displaced, and thus the outer composite wire 3 is further less likely to be deformed.

[0023]

Embodiment 1 of the invention of claim 1 BiPbSrCaCuO
The primary raw material powder was filled into an Ag pipe having an outer diameter of 25 mmφ and an inner diameter of 20 mmφ to form a billet, which was plastically worked to finish into a composite wire material having a width of 5 mm and a thickness of 0.2 mm.
This was heat-treated in the air at 840 ° C. for 100 hours to obtain a superconducting tape wire. Next, five obtained tape wire materials were laminated and one end was soldered and fixed. A total of 10 blocks of these were produced. These have an outer diameter of 35 mmφ and an inner diameter of 30 m.
A ceramic superconducting conductor having a total length of 1 m as shown in FIG. 3 was produced by spirally winding it on an mφ SUS former so as to have a pitch of 1 m, and finally soldering the other end.

The Ic of the obtained ceramic superconducting conductor was measured in liquid nitrogen at 0 magnetic field.
An excellent property of 0 (A) was obtained.

[0025]

[Embodiment 2 of the invention according to claim 1] After a ceramic superconducting conductor similar to that of Embodiment 1 is produced, the outermost layer having a thickness of 0.
A Cu tape having a width of 05 mm and a width of 20 mm was spirally wound and fixed. In this case, after the Cu tape was pressed and wound at a coarse pitch, the other side surface 9 of the laminated block 4 was fixed by soldering.

The obtained Lamix superconducting conductor was measured for Ic in liquid nitrogen at 0 magnetic field.
An excellent property of 0 (A) was obtained.

[0027]

Comparative Example with Examples 1 and 2 of the Invention of Claim 1 In the same manner as in Example 1, a superconducting tape-shaped composite wire having a width of 5 mm and a thickness of 0.25 mm was obtained. It heat-processed and made the ceramic raw material in the tape-shaped composite wire 3 into superconductivity. The tape-shaped composite wire 3 thus obtained was laminated to obtain a laminated block. This has an outer diameter of 35 mm
φ, pitch 1m on SUS former with inner diameter 30mmφ
In total, 5 layers were wound in a spiral shape to obtain a ceramic superconducting conductor.

As a result of measuring Ic in an O magnetic field in liquid nitrogen for the obtained ceramics superconducting conductor, 27
It was 0 (A), which was extremely inferior to that of the present invention. After the measurement, the tape-shaped composite wire inside was examined, and it was found that the tape-shaped composite wire was deformed as shown in FIG.

[0029]

[Embodiment 1 of the invention according to claim 2] BiPbSrCaCuO
The primary raw material powder was filled into an Ag pipe having an outer diameter of 25 mmφ and an inner diameter of 20 mmφ to form a billet, which was plastically processed to have a width of 5 mm, 5.2 mm, 5.4 mm, 5.5 mm,
Eight types of tape-shaped composite wire rods 3 having a size of 5.6 mm, 5.8 mm, 6 mm, 6.2 mm and a thickness of 0.25 mm were finished. This was heat-treated in the air at 840 ° C. for 100 hours to make the ceramic raw material in the tape-shaped composite wire 3 superconducting. Eight pieces of tape-shaped composite wire 3 thus obtained
20 layers were prepared by stacking with a wide width on top and soldering and fixing one side surface 8 on one side in the width direction. Outer diameter of these laminated blocks 4 is 35 m
It is spirally wound around the outer periphery of the SUS former 5 having a diameter of mφ and an inner diameter of 30 mmφ at a pitch of 1 m, and then the other side surface 9 of the laminated block 4 is soldered to have a total length of 1 m as shown in FIG. The ceramic superconducting conductor of was produced.

The obtained ceramic superconducting conductor was measured for Ic in liquid nitrogen at 0 magnetic field.
An excellent property of 0 (A) was obtained.

[0031]

Example 2 of the invention according to claim 2 A ceramic superconducting conductor similar to that of Example 1 was produced. At this time, the laminated block 4 was bent and wound in the width direction of the tape-shaped composite wire 3 so that the former 5 and the tape-shaped composite wire 3 of the lowermost layer of the laminated block 4 contact each other. Then, a Cu tape having a thickness of 0.05 mm and a width of 20 mm was spirally pressed and wound around the outermost layer, and then the other side surface 9 of the laminated block 4 was soldered and fixed.

The obtained ceramic superconducting conductor was measured for Ic in liquid nitrogen at 0 magnetic field.
An excellent property of 0 (A) was obtained.

[0033]

A comparative example with the first and second embodiments of the invention of claim 2
5 mm in width and 0.2 in thickness in the same manner as in Example 1 of the invention.
A 5 mm tape-shaped composite wire 3 was heat treated in the same manner as in Example 1, and the ceramic raw material in the tape-shaped composite wire 3 was made into a superconductor. The tape-shaped composite wire 3 thus obtained was spirally formed on the outer periphery of the SUS former 5 having an outer diameter of 35 mmφ and an inner diameter of 30 mmφ at a pitch of 1 m, in a state where the tape-shaped composite wire 3 was not formed into a laminated block, and a total of 8 A ceramic superconducting conductor was produced by winding layers.

The obtained ceramic superconducting conductor was measured for Ic in liquid nitrogen at 0 magnetic field.
470 (A), which was extremely inferior to that of the present invention. Further, when the tape-shaped composite wire rod inside was examined after the measurement, it was found that the tape-shaped composite wire rod 3 was deformed as shown in FIG. 3 (b).

[0035]

INDUSTRIAL APPLICABILITY The ceramic superconducting conductor of the present invention is a ceramic superconducting conductor having a high Ic without deterioration of the superconducting characteristic due to the deformation of the tape-shaped composite wire 3 as in the prior art, and can be applied as a cable conductor.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a ceramics superconducting conductor of the present invention.

FIG. 2 (a) is a front view showing another embodiment of the ceramics superconducting conductor of the present invention, and FIG. 2 (b) is a front view showing an embodiment in which a holding tape is wrapped around the outer periphery of the ceramics superconducting conductor.

3A and 3B are perspective views showing different examples of laminated blocks used for the ceramics superconducting conductor of the present invention.

FIG. 4A is a perspective view showing an example of a conventional ceramics superconducting conductor, and FIG. 4B is a partial detailed view of the same ceramics superconducting conductor.

5 (a) to 5 (d) are front views showing different examples of conventional tape-shaped composite wire rods.

[Explanation of symbols]

 1 Ceramics Superconductor 2 Metal Material 3 Composite Wire 4 Laminated Block 5 Former

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Tanaka 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Yasuzo Tanaka 2-6-1 Marunouchi, Chiyoda-ku, Tokyo No. Furukawa Electric Co., Ltd. (72) Inventor Tsukushi Hara 2-4-1 Nishitsujigaoka, Chofu, Tokyo Tokyo Electric Power Co., Inc. Technical Research Institute (72) Hideo Ishii 2-chome Nishitsujigaoka, Chofu-shi, Tokyo No. 1 Inside TEPCO Technical Research Institute

Claims (2)

[Claims] 1. A laminated block 4 is prepared by laminating a plurality of tape-shaped composite wire rods 3 having the same width, which are composed of a ceramic superconductor 1 and a metal material 2, and the laminated block 4 is formed on the outer periphery of a desired number of formers 5. A ceramics superconducting conductor characterized by being arranged. 2. A tape-shaped composite wire 3 comprising a ceramics superconductor 1 and a metal material 2 having different widths, which are trapezoidal in cross section by laminating the tapes so that the widths of the tapes become wider in order. A ceramic superconducting conductor, characterized in that a laminated block 4 is prepared and the laminated block 4 is arranged on the outer periphery of a desired number of formers 5.