JPH02103813A - Compound superconducting wire and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce ac loss by providing a superconducting part composed of an in-situ conductor in which multiple fiber superconducting filaments are arranged, a stabilized conductor divided into at least three parts, and a coated layer by which each stabilized conductor is partitioned. CONSTITUTION:The Sn of a plate 10 compounded outside of the in-situ rod 9 is diffused in the rod 9 to have it reacted with a Nb extra fine filament for the formation of a filament of a Nb3Sn superconducting intermetallic compound to provide a superconducting part 5. The wire B is of the structure in which a stabilized conductor 6 divided into eight parts outside the superconducting part 5, and a metallic layer 7 are arranged. When the superconducting part 5 is going to transpose to a normal conducting state, current is going to run in the stabilized conductor 6a, which, however, is separated by a coated layer 6b of higher resistance than that of the pure copper, and as the cross section is divided in fan-shaped ring compounds in the structure, ac loss to be generated in the conductor 6a can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a compound-based superconducting wire suitable as a field winding for a superconducting generator.

``Prior art'' In superconducting wires, heat may be generated due to the movement of quantum magnetic flux lines, etc. In such cases, buds of normal conductivity occur partially in the superconducting wire, and the entire superconducting wire becomes There is a risk of transition to a normally conducting state.

Therefore, in order to stabilize superconducting wires by preventing such magnetic instability and normal conductive dislocations, the shearing technique described below has been employed heretofore.

■Superconductor is buried inside a stable base material with good conductivity such as copper. In particular, the stabilizing base material is formed from high-purity copper that has low electrical resistance at cryogenic temperatures.

(2) Ultra-fine superconductor into a filament with a diameter of several micrometers to several tens of micrometers.

■Twisting multi-core wires containing ultra-fine superconducting filaments.

■Use braided or formed stranded wire structures.

(2) When using a superconducting wire for alternating current, a stabilizing base material is made of a high-resistance metal material such as a CuNi alloy to suppress the coupling current generated between superconducting filaments.

■Since superconducting properties of compound-based superconductors deteriorate when mechanical strain is applied, reinforcing materials are attached to superconducting wires to prevent mechanical strain from being applied.

Against this background, a superconducting wire A having a cross-sectional structure shown in FIG. 5 has been provided as an example of an AC compound superconducting wire. This superconducting wire A comprises a superconducting strand 2 by arranging a large number of compound superconducting filaments inside a stabilizing base material made of copper, and a plurality of these superconducting strands 2 are connected to a stabilizing material made of oxygen-free copper. The structure is such that each superconducting element wire 2 is fixed to the stabilizing material 3 with a metal 4 by soldering or other brazing.

That is, in the superconducting wire Δ having this structure, the stabilizing material 3 serves to stabilize each superconducting strand 2 and also serves as a reinforcing material for the superconducting strand 2.

[Problem to be solved by the invention] In recent years, as part of the application of superconducting technology to the field of electric power and energy, research has been underway to create a prototype of a superconducting generator.
The development of AC superconducting wires for use as field windings in superconducting generators is also progressing.

However, when considering the conventional superconducting wire A having the structure shown in FIG.
Since brazing is a structure in which the stabilizing wire is fixed to the stabilizer wire through the metal 4, there is a problem that the effect of stabilizing the superconducting properties is not sufficient, and the development of superconducting wires with a more desirable structure for AC use is progressing. It is being

The present invention has been made to solve the above problems,
The purpose of the present invention is to provide a compound-based superconducting wire with an excellent structure and low loss for AC use.

In order to solve the problem, the invention described in claim 1 has the following features:
A superconducting part consisting of an in-situ conductor made of a large number of fibrous superconducting filaments arranged inside a metal base, a metal layer surrounding this superconducting part, and a stabilizing conductor part surrounding this metal layer. and a metal layer provided surrounding this stabilizing conductor part, and the stabilizing conductor part is made of pure copper and is constructed by dividing the stabilizing conductor part into three or more parts. It consists of conductors and a coating layer of a high-melting point, high-resistance metal that covers the individual peripheral surfaces of these stabilized conductors and partitions each stabilized conductor.

In order to solve the above problem, the invention described in claim 2 has the following features:
A superconducting portion having a fibrous superconducting filament, a stabilizing conductor portion surrounding this superconducting portion, and a metal layer surrounding this stabilizing conductor portion, the superconducting portion comprising: The in-situ conductor is constructed by dividing a superconducting part into three or more parts, and a metal layer is provided surrounding each of these in-situ conductors and dividing each in-situ conductor. .

The conductor is made up of a large number of superconducting filaments arranged inside a metal base, while the stabilizing conductor section is a stabilized conductor made of pure copper that is divided into three or more parts surrounding the stabilizing conductor section. and a coating layer of a high-resistance metal having a relatively high melting point and surrounding each of these stabilizing conductors.

In order to solve the above problem, the invention described in claim 3 has the following:
A superconducting intermetallic compound is formed on the outer periphery of an in-situ part H consisting of an in-situ ingot in which dendrites of at least one element among the elements constituting the superconducting intermetallic compound are dispersed inside a metal base. -The back of the element,
A coating layer of the remaining elements is formed to form a composite phase, and a coating layer made of a high melting point metal such as Ta or Nb is formed on the outer periphery of the stabilizing material made of pure copper to form a stabilizing material. The stabilizing material is arranged all around the composite material,
Furthermore, after covering the outside with a metal tube, the diameter of the entire cable is reduced to create a wire, and then the wire is subjected to diffusion heat treatment to diffuse the elements of the coating layer to produce a superconductor.

"Function" Since the stabilizing conductor is divided into three or more parts around the circumference and the stabilizing conductor surrounds the superconducting part, AC loss is reduced. Further, the coating layer of a high melting point metal covering each stabilizing conductor prevents unnecessary elements from diffusing to the stabilizing conductor side during diffusion heat treatment performed to generate a compound superconductor. Furthermore, since the coating layer is made of a high-resistance, high-melting-point metal and separates the stabilizing conductor, the AC loss of the stabilizing conductor is also reduced and the stabilizing effect is enhanced. Since the superconducting portion is composed of an in-situ conductor having fibrous filaments, it has excellent machinability and can be easily reduced in diameter, and its superconducting properties are less likely to deteriorate even when mechanical strain is applied. The metal layer provided on the outside of the stabilizing conductor provides protection when the superconducting wires are stranded, and eliminates coupling loss between adjacent superconducting wires when AC current is applied after stranding. do.

The present invention will be explained in more detail below.

1(A) shows an example of the structure of the superconducting wire of the invention of claim J applied to the Nl)3Sn system, and FIG.
) to (M) are for explaining the method for manufacturing a superconducting wire of the present invention applied to N b3S n system.

The superconducting wire B of this example includes a superconducting part 5 in which filaments of a compound superconductor are arranged inside a metal base, a metal layer 5a provided surrounding this superconducting part 5, and this metal layer 5.
It is mainly composed of a stabilizing conductor section 6 provided surrounding a portion a, and a metal layer 7 provided surrounding this stabilizing conductor section 6.

The superconducting portion 5 is constructed by disposing a large number of discontinuous ultra-fine fibrous superconducting filaments of Nb3Sn inside a base made of Cu or Cu-9n alloy. Further, the metal layer 5a is made of a Cu-Sn alloy or the like. The stabilizing conductor portion 6 includes a stabilizing conductor 6a having a fan-shaped annular cross section formed by dividing the stabilizing conductor portion 6 into a plurality of parts (in this example, eight parts) around the circumference thereof, and these stabilizing conductors. A coating layer 6b made of a high-melting point, high-resistance metal material that individually surrounds the periphery of each stabilizing conductor 6a and partitions each stabilizing conductor 6a.
It consists of The stabilizing conductor 6a is made of pure copper, and the coating layer 6b is made of a metal material such as Ta or Nb, which has a melting point of 800° C. or more and has a higher electrical resistance than copper. Further, the metal layer 7 is made of Cu5n alloy, Cu-Zn
It is made of a copper alloy such as a Cu-Ni alloy.

To manufacture the superconducting wire B having the above structure, first, a Cu-Nb alloy having a predetermined composition is melted to produce an in-situ ingot 8 shown in FIG. 1(B), and this in-situ ingot 8 is subjected to diameter reduction processing. As a result, an in-situ rod 9 shown in FIG. 1(C) is created. The in-situ ingot has a structure in which countless dendrites made of Nb are dispersed inside a metal base made of Cu or Cu-8n alloy, and has excellent workability, and the in-situ ingot 8 is reduced in diameter. The Nb dendrites are thereby transformed into discontinuous fibrous filaments.

Next, around the in-situ rod 9, as shown in FIG.
A plate lO made of Sn is wound as shown in Fig. 1 (
Cover the entire surface of insitu rod 0 as shown in E),
Next, Cu-Sn is applied to the outside as shown in FIG.
Cover it with the tube body 11 made of alloy. Next, this is reduced in diameter to obtain a superconducting portion 44I2 shown in FIG. 1(G).

On the other hand, N b or ' A composite body 15 is obtained by covering it with a diffusion prevention tube I4 made of a high-melting I plate metal having good workability and having an electric resistance K < than that of copper such as I''a and a melting point of 800 DEG C. or higher. Here, the reason why 'I''aAroL''IINh was selected as the constituent material of the anti-diffusion IL tube 14 is as follows.
The stabilizing base material 13 is easy to perform in the post-process for diameter reduction and during the diffusion heat treatment for producing superconductors in the post-process.
Stabilized Cl by preventing essential elements from diffusing to the side.
For the purpose of preventing contamination of the shrine 13 and to avoid forming unnecessary compounds between the constituent elements of stabilization + fl + A' + 3 during the diffusion heat treatment, the 'I'' a color is I.
I selected \■b. Therefore, use a iron to prevent diffusion tube 14.
(14) If the metal is a metal with a high melting point and has a higher electrical resistance than pure copper +41-1, a metal material such as stainless steel may be used in addition to Ta and Nb.

Next, the diameter of the composite body 15 is reduced to obtain the stabilizing material 16 shown in FIG. The Cu-Sn alloy,
The secondary composite body 1 shown in FIG. 1(K) is inserted into a tube body 17 made of a copper alloy such as a Cu-Zn alloy or a Cu-Ni alloy.
Get 8. Next, the diameter of this secondary composite 18 is reduced until it becomes equal to the wire diameter of the superconducting wire to be finally obtained, as shown in FIG.
) The strand 22 shown in Fig. A metal layer 7 made of a copper alloy is formed on the outermost periphery of the wire 22.
1. A stabilizing conductor portion 6 is formed on the inside thereof, and a consolidated body of superconducting material I2 is further formed on the inside thereof.

Next, this wire 22 is heated to several IO to several 1 at 500 to 700°C.
The Sn of the plate 10 composited on the outside of the in-situ rod 9 is diffused into the inside of the in-situ rod 9.
superconducting portion 5 by reacting with the ultrafine filaments of
to obtain the superconducting wire I3 shown in FIGS. 1(M) and 1(A). In this superconducting wire I3, Inzaiji, [1
Since it diffuses to the 5nfJ in-situ body 19 side and the tubular body 11 side of the Sn plate 10 arranged around the outer periphery of the superconducting portion 5, a metal layer 5a of Cu-8 n alloy remains on the outer periphery of the superconducting portion 5.

During the diffusion heat treatment, Sn that is diffused toward the in-situ rod 9 side also tries to diffuse outward, but the diffusion is prevented by the thin coating layer 6b that exists on the inner and outer peripheries of the chemotactic conductor 6a, and the stabilizing conductor 175 staining due to Sn of 6a should be prevented. Note that the stabilizing conductor 6a is free from Sn contamination and has an extremely low la. This is not preferable because it increases the electrical resistance of the stabilizing conductor 6a.

Superconducting portion 5 of superconducting wire B manufactured in -1;)
Since it is manufactured based on Insitu: 10t9, it has excellent critical current characteristics and is also excellent in terms of mechanical strength, with little deterioration of superconducting characteristics even when subjected to mechanical strain. Also,
Since the superconducting wire 3 has a stabilizing conductor part 6 and a metal layer 7 arranged outside the superconducting part 5, it has a structure reinforced by these, and has a structure with high mechanical strength.

The superconducting wire B is used after being cooled to a cryogenic temperature using a medium such as liquid helium. If a part of the superconducting portion 5 attempts to transition to a normal conductive state for some reason, a current is passed through the stabilizing conductor 6a to prevent heat generation from rain.

Furthermore, if the superconducting wire B is used for alternating current and a part of the superconducting portion 5 is transposed to a normal conductive state and tries to do so, it will not be stable regardless of whether an alternating current flows through the stabilizing conductor 6a. The stabilizing conductor 6a is separated by a covering layer 6b which has a higher electric resistance than pure copper, and because the structure has a fan-shaped annular body in cross section, the stabilizing conductor 6a... AC loss can be reduced. For this reason, the superconducting wire ``)!'' exhibits extremely high stability when used for alternating current applications.

Incidentally, in the above example, the structure of the present invention was explained as an example in which the structure of the present invention was applied to the structure of a Nb3Sn-based superconducting wire.
Of course, it can be applied to the structure of compound-based superconducting wires such as No. 1. In addition, the stabilizing conductor 6a (not limited to the 18-divided structure, but the 3-divided side -1-; (,r) Not shown in (K), the stabilizing material 16 with a circular cross section is processed to have a fan-shaped cross section f.
Although the Lli-shaped stabilizing conductor 6a was formed, the stabilizing element +
4' I 6 was previously formed into a fan-shaped annular body in cross section, and then placed on the outer periphery of the superconducting part +, l'12, and then subjected to diameter reduction [, to form the wire shown in Fig. 1 (1,). 22 may be prepared.

FIG. 2 shows an example of the structure of a superconducting wire 1 constructed using the superconducting wire B of the present invention.

The superconducting stranded wire C in this example is constructed by alternately twisting the superconducting wire B and the hollow wire 30 made of a Cu13%Sn alloy.

To manufacture superconducting stranded wire C with this structure, diffusion heat treatment n
It is manufactured by twisting the strands 22 of ij with wire rods 30 and then subjecting them to diffusion heat treatment. The reason for manufacturing in this way is that N1)3Sn is extremely hard and brittle, making it difficult to strand the wire after forming NbaSn.

The superconducting stranded wire C in this example has a structure in which the superconducting wire B is reinforced with a wire 30, thereby increasing the mechanical strength of the entire stranded wire. Further, since the metal layer 7 made of a high resistance copper alloy is formed on the outermost periphery of each superconducting wire B, it is possible to reduce the coupling loss between the superconducting wires B when AC current is applied.

Further, as a structure of the superconducting stranded wire, as shown in FIG. 3, only the superconducting wires B may be twisted together to produce a superconducting stranded wire.

When manufacturing the superconducting stranded wire having the structure shown in FIG. 3, it can also be manufactured by performing diffusion heat treatment after twisting the strands 22 shown in FIG. 1(L).

FIG. 4(A) shows an example of the structure of the superconducting wire of the invention of claim 2 applied to the Nb3Sn system, and FIG. It is something.

The superconducting wire E shown in FIG. 4(A) includes a superconducting portion 35 having an extremely thin filament of a compound superconductor, a metal layer 35A provided surrounding this superconducting portion 35, and a metal layer 35Δ The stabilizing conductor portion 36 is
Surrounding this stabilizing conductor portion 36, a space A1 is mainly composed of a metal layer 37.

In the superconducting wire E, the metal layer 37 and the stabilizing conductor portion 3
6 has the same structure as the metal layer 7 and stabilizing conductor portion 6 of the superconducting wire B described above, but the structure of the superconducting portion 35 is different.

This superconducting part 35tJ, an in-situ conductor 35a with a round cross-section arranged in the center, an in-situ conductor 35t with a fan-shaped annular cross-section arranged around it, and surrounding these conductors and partitioning each conductor. It is composed of a covering layer 35c.

In order to manufacture a superconducting wire E having the following structure, an in-situ ingot is reduced in diameter to produce an in-situ lot 40 shown in FIG. 4(B).
A tube body 41 made of Sn is attached to the outer periphery of the
) As shown in the figure, multiple pieces (7 pieces in the drawing) are assembled to
A tube body 42 made of a copper alloy such as a Sn alloy, a Cu-Zn alloy, or a Cu-Ni alloy is covered and the diameter is reduced to create a composite body 43 shown in FIG. 4(D). Next, a plurality of stabilizing materials 16 (eight in the drawing) used in the example described above are placed around the outer periphery of this composite 43, and Cu-Sn alloy, Cu
- The wire 4 shown in FIG.
Get 6. Next, this strand 46 is subjected to a diffusion heat treatment similar to the example described above to diffuse Sn and produce superconducting filaments, thereby obtaining the superconducting wire E shown in FIGS. 4(G) and (A). I can do it.

The superconducting wire E having this structure has the same effect as the superconducting wire B described above. Furthermore, since the superconducting section is constituted by a plurality of in-situ conductors 35b having a fan-shaped annular cross section, the structure has a structure in which AC loss in the superconducting section is also reduced.

"Example 1" An in-situ ingot made of Cu-Nb alloy with a diameter of 150 mm and a length of 300 mm was created by a crucible melting method, and this in-situ ingot was reduced to a diameter of 50 mm to obtain an in-situ rod. Ta. Next, wrap an Sn plate with a thickness of 5 mm around the entire circumference of this in-situ rod.
Directly inserted into a tube made of u-6%Sn alloy, 5
A superconducting material was obtained by reducing the diameter to 0 mm.

Next, a rod with a diameter of 50 mm made of oxygen-free copper with a residual resistance value RRR of 200 is prepared, and a wall with a thickness of 2 mm is placed around the rod.
The tube was covered with a diffusion prevention tube made of Ta, and the outer diameter was reduced to 30 mm using a swaging device to obtain a stabilized material.

Next, eight pieces of the stabilizing material were arranged around the outer circumference of the superconducting material, and the whole was made of a Cu-based material with an outer diameter of 135 mm and an inner diameter of 115 mm.
It is inserted into a tube made of 6% Sn alloy, subjected to appropriate intermediate annealing treatment, and then reduced in diameter by cold working to an outer diameter of 0.4 mm.
A strand of wire was obtained.

Then, the cable wire was heat-treated at 600° C. for 200 hours to diffuse Sn and produce filaments of Nb3Sn superconducting intermetallic compound to produce a superconducting wire.

The superconducting wire manufactured in this manner was able to reduce AC loss by several minutes compared to a superconducting wire whose stabilizing body portion did not have a divided structure.

"Example 2" An in-situ ingot equivalent to that used in Example (■) is reduced to a diameter of 15 mm to obtain an in-situ rod, and a tape made of Sn is wrapped around the outer circumference of this in-situ ingot to obtain a superconducting material. and this superconducting material to 7
This book is assembled in the same way as shown in Figure 4 (C) and has an outer diameter of 80 mm.
The superconducting material was inserted into a tube with an inner diameter of 70 mm and reduced in diameter to an outer diameter of 50 mm to obtain a superconducting material. Using this superconducting material and the stabilizing material used in Example 1, the same method as in Example 1 was carried out to obtain a wire having an outer diameter of 0.4 mm.

Then, the wire was heat-treated at 600° C. for 200 hours to diffuse Sn and produce a filament of Nb5sn superconducting intermetallic compound to produce a superconducting wire.

The superconducting wire manufactured in this manner was able to reduce AC loss to several times lower than that of a superconducting wire in which the stabilizing copper portion did not have a divided structure.

"Effects of the Invention" - As explained, the present invention includes a split stabilizing conductor that is divided into three or more parts in the circumferential direction, and a superconducting part is provided inside the stabilizing conductor, so that AC When used for commercial purposes, AC loss can be reduced. Furthermore, since the superconducting portion is made of an in-situ conductor with excellent machinability, diameter reduction processing is easy, and even when mechanical strain is applied to the superconducting wire, there is little deterioration in superconducting properties. In addition, since we have adopted a structure in which the stabilizing conductor is covered with a coating layer of a high-melting point metal and the superconducting part is covered, the stabilizing conductor will not be contaminated with diffusion elements during diffusion heat treatment. Defense 1
The superconducting wire of the present invention has excellent characteristics for use in alternating current applications because it is surrounded by a coating layer with a high melting point and high electrical resistance, thereby reducing the coupling loss of the stabilizing conductor. Furthermore, a stabilizing conductor made of pure copper and a metal layer are arranged on the outside of the superconducting part, so it is mechanically strong and
It has a compact structure. Therefore, the superconducting wire of the present invention is extremely excellent as an AC superconducting wire such as a field winding of a superconducting generator.

Further, according to the method of the present invention, it is possible to manufacture a superconducting wire that has a divided structure, has a stabilized conductor free from contamination by unnecessary elements, and has excellent AC characteristics. Furthermore, since an in-situ conductor is used, diameter reduction processing can be performed without causing troubles such as wire breakage, and a superconducting wire that has ultra-fine fibrous superconducting filaments and is resistant to mechanical strain can be obtained.

[Brief explanation of drawings]

FIG. 1(A) is an enlarged sectional view showing an example of the structure of the superconducting wire of the invention described in claim 1, FIG. 1(B) is a sectional view of an in situ ingot, and FIG. 1(C) is an in situ rod. 1(D) is a sectional view showing the state in which the plate is wound around the in-situ rod. FIG. 1(E) is a sectional view showing the state in which the plate is wound around the in-situ rod. Figure 1 (F) is a cross-sectional view showing the state in which the tube body is covered on the outside of the plate, Figure 1 (G) is a cross-sectional view of the superconducting material, and Figure 1 (
H) is a sectional view of the composite, FIG. Figure 1 (K) is a cross-sectional view showing the state in which the stabilizing material in the assembled state is inserted into the tube body, Figure 1 (r,) is a cross-sectional view of the strand, and Figure 1 (M) is a cross-sectional view of the superconducting wire. , FIG. 2 is a perspective view showing an example of a superconducting stranded wire, FIG. 3 is a sectional view showing another example of a superconducting stranded wire, and FIG. FIG. 4(B) is an enlarged sectional view showing an example of the structure; FIG. 4(B) is a sectional view of an in-situ lot; FIG. 4(C) is a sectional view showing an assembled state of in-situ lots; FIG. 4(D) is a cross-sectional view of a composite Cross-sectional view, Figure 4 (E)
4(F) is a sectional view of the strand, FIG. 4(G) is a sectional view of the superconducting wire, and FIG.
The figure is a cross-sectional view showing an example of the structure of a conventional super 7 conductor wire. E 6b・ 8... A superconducting wire, C, D Superconducting stranded wire, 5 Superconducting part, 5a... Metal layer, 6 Stabilizing conductor part, 6a... Stabilizing conductor, coating layer, 7
．． 37 - Metal layer, in-situ ingot, in-situ lot, 5a, 35b in-situ conductor, 5 c- coating layer.

Claims (3)

[Claims] (1) A superconducting section consisting of an in-situ conductor formed by disposing a large number of fibrous superconducting filaments inside a metal base;
A metal layer provided surrounding this superconducting portion, a stabilizing conductor portion provided surrounding this metal layer, and a metal layer provided surrounding this stabilizing conductor portion. The conductor part consists of a pure copper stabilizing conductor that is divided into three or more parts around the stabilizing conductor part, and a high melting point that covers the circumferential surface of each of these stabilizing conductors and divides each stabilizing conductor. A compound-based superconducting wire characterized by comprising a coating layer of a high-resistance metal. (2) comprising a superconducting part having a fibrous superconducting filament, a stabilizing conductor part provided surrounding this superconducting part, and a metal layer provided surrounding this stabilizing conductor part; The superconducting section includes an in-situ conductor formed by dividing the superconducting section into three or more parts, and a metal layer surrounding each of these in-situ conductors and partitioning each in-situ conductor. The conductor is composed of a large number of superconducting filaments arranged inside a metal base, while the stabilizing conductor section is made of pure copper and is composed of three or more parts surrounding the stabilizing conductor section. covering the conductors and the individual circumferential surfaces of these stabilizing conductors;
A compound-based superconducting wire characterized by comprising a coating layer of a high-melting-point, high-resistance metal that separates each stabilizing conductor. (3) The elements constituting the superconducting intermetallic compound are placed on the outer periphery of an in-situ member consisting of an in-situ ingot in which dendrites of at least one of the elements constituting the superconducting intermetallic compound are dispersed inside a metal matrix. Among them, a coating layer of the remaining elements is formed to form a composite material, and a coating layer made of a high-melting point metal such as Ta or Nb is formed on the outer periphery of the stabilizing material made of pure copper to form a stabilizing material. Then, the stabilizing material is placed around the entire circumference of the composite material, and a metal tube is placed on the outside of the material, and the diameter of the entire material is reduced to create a strand, and then this strand is subjected to diffusion heat treatment. A method for manufacturing a compound-based superconducting wire, characterized in that a superconductor is produced by diffusing elements in a coating layer.