JPS58192210A - Method of producing composite superconductive wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing composite superconducting conductors such as ultrafine multicore conductors.

Nb-Ti-based ultrafine multicore composite superconducting wires have a structure in which a large number of continuous Nb-Ti filaments are arranged in a copper or other normal-conducting metal gold matrix for the purpose of thermal and electrical stabilization. What it has is well known. There are the following methods for manufacturing this type of superconducting wire. For example, a normally conductive metal pipe with an outer diameter of up to 8° and a Nb
- Methods such as inserting a large number of superconducting blades 1ilk into a normal conductive metal tube or tube using a T'i alloy superconducting wire or the like coated with a fully normal conductive gold plate, and then forging, swaging, drawing, rolling, etc. The surface of the elm was reduced, the twisting process was added to the necessary degree, and the required dimensions were completed to form the superconducting t'te-
Manufacture.

Another manufacturing method is to insert a Nb-Ti alloy superconducting element 1 coated with a large number of normal-conducting metals into a normal-conducting metal shell having an outer diameter of 140 W to 250 W, and
By bringing metal plates 1r of the same type into bath contact with both end faces of the metal pipe, the inside of the pipe is evacuated and the superconducting strands and the like are completely encapsulated to form a composite billet '1. Then, by extrusion processing method, it is made into a composite bar with a diameter of 80-30m.Then, it is processed by forging, extrusion, swaging, drawing, etc. to reduce the surface area, and finished to the required dimensions, adding twist processing to the necessary degree. We are manufacturing Nb-Ti ultrafine multicore superconducting at. By the way, in this Nb-Ti composite superconducting wire, Nb
- The diameter and length of the Ti filaments has been selected to be approximately 60 μm or less, and the current capacity required for Pgr can be obtained by using tens of filaments or more.Recently, superconducting wires have been used in nuclear fusion devices, magnetic levitation arrays, Superconducting generator, particle accelerator, energy storage electrical manufacturing, MHD
It is actively used in research and development of power generation and magnetic separation devices.

These will soon be put to practical use, but superconducting wires are sometimes used, for example, in a monolithic type 3 in which a large number of Nb-Ti alloy filaments 2 are embedded in a steel matrix 1, as shown in the cross-sectional view in Figure 1. . In addition, large-sized conductors with large current capacities are used especially for superconducting conductors used in nuclear fusion devices, high-energy physics research devices, etc. A large number of twisted composite superconducting wires 5 are arranged on top of the base material 4.
There is a method of joining the superconducting wire 5 and the superconducting wire 5 using solder, etc., and if necessary, as shown in FIG. 2Cb), a lid 6t of a normal conductive metal is joined to form a large current superconducting conductor.

Regarding the production of the above-mentioned L-shaped superconducting conductor, joining methods such as soldering are often used to join the copper base material 4 and the composite superconducting wire 5, but the hanging portion is used to stabilize the superconducting conductor. This unnecessarily increases the cross-sectional area of the superconducting conductor, leading to an increase in the size of the superconducting coil. Furthermore, it is difficult to completely prevent the formation of voids in the solder portion, which causes a total loss of thermal and electrical conductivity. In addition, in the production of such conductors, extrusion and drawing are generally used to produce the base material 4 with particularly deep grooves, but the forming process is extremely troublesome, and the connection between the base material 4 and the superconducting strands 5 is difficult. During soldering work, long base material 4 and base material 1H5 are used.
Moreover, operations such as supplying solder, heating, and cooling after welding are complicated, and unnecessary solder adheres to the outer surface of the base material 4, and it takes time and effort to remove this solder t-1.

This invention was made in order to eliminate all the drawbacks of the conventional ones as described above, and includes a process of processing a metal plate into a pipe shape so as to surround an unaligned wire bundle containing a superconductor. After that, the above-mentioned strands are subjected to a cross-section reduction process within a range that does not break, thereby providing a complete method for manufacturing a composite superconducting conductor that can industrially and easily manufacture a highly stable large-current container superconducting conductor. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows the equipment for carrying out the entire manufacturing method of the present invention, in which 7 is a superelectric 4-element li! wound around Devin 8!
A wire bundle consisting of a twisted string Eri containing il, 9 is also an l pin lO
A normally conductive metal plate 11 is wound around the metal plate 10.
'ka? 12 is a tungsten electrode rod necessary for generating an arc between the wire bundle 7 and the metal plate 9; be.

Wire bundle 7 wrapped in a metal plate 9 processed into a pipe shape
is a stranded wire that includes *'r of the other pole if necessary, and in order to prevent the wire from breaking during cross-section reduction processing later, regardless of whether the shape of the wire is round or hexagonal, it is lined up and surrounded by a pipe. However, for industrial production, this is only possible when the number of strands is limited to a small number, and as the number of strands increases, it is often the case that they cannot be aligned. Therefore, in times like these, Superconducting XI! A wire bundle body 7t-
After being wrapped in a pipe, a large superconducting conductor with a tight structure can be manufactured by reducing the cross section of the composite conductor within a range that does not cause wire breakage within the composite conductor. The twisting pitch of the wire bundle may be as long as the superconducting wires are not subjected to strong processing due to twisting, and it does not necessarily have to be twisted wires. It does not affect the amount of money.

′″mal″1M*f 9 n°Ow1″′−”9°
'1 However, it is necessary to have a width suitable for flat iso coating, and since the thickness affects copper coating, it is determined by going back to the composition of the finished edge material.

The wire bundle 7 containing the superconducting X-ray beam, the normal conductive metal plate 9, and the scraping bin 13 are pulled and moved by the rotational force VC, and the metal plate 9 gradually surrounds the wire bundle 7 by the roller group 11. When it is made into a pipe, the arc generated between it and the tungsten electrode rod 12 has an edge.
Opposite edges of the eaves are welded together. The welded composite is then wound onto a winding bin 13. The rolled up complex is...! The drawing process is carried out within the range that does not cause the element inside the tube to break off.
It becomes a large current superconducting conductor by reducing the cross section of the material using methods such as swaging. The superconducting conductor manufactured in this way can be easily produced with good reproducibility without using bonding materials such as solder, and has a stable working chamber.

In addition, in the embodiment, when forming the normal conductive metal plate 9) or the wire bundle 7, the inside diameter of the wire is such that it can sufficiently contact the wire bundle 7 and deform the wire bundle within a range that does not cause any harm to the wire bundle. It is preferable to do this, and by doing this, the incidence of wire breakage at the beginning of the reduction process can be reduced. In addition, the heat source for mother-iso bath welding may be an electron beam, a Zolaz i-beam, etc. in addition to an arc, or a method such as brazing may be used instead of welding. In addition, in the case of welding, it is desirable to weld the entire thickness of the metal plates 9, but this is not necessarily necessary and does not affect the reduction process.

If the metal plate 9 is thick, bonding may be omitted.

This is because an effective amount of reduction processing becomes possible, and joining can often be omitted, especially when processing is performed mainly with compressive force in the radial direction, such as in swaging.

The wire bundle 7 is overheated during welding of the above-mentioned DIZO, and in the case of Nb--Ti alloy superconducting wire, for example, there is a fear that its current characteristics may deteriorate. However, if the metal plate 9 is made of oxygen-free steel, even though it may be heated to 230°C depending on the conditions during arc welding, it is usually heated to 180-200°C because the superconducting wire itself has good thermal conductivity. The temperature only increases, and therefore the current characteristics do not deteriorate. In addition, when welding, it is preferable to replace the vicinity of the welded area with an inert atmosphere such as argon in advance in order to prevent oxidation of the inner surface of the pipe and the surface of the wire. Although the case of a circular pipe has been described, it is also possible to create a composite body of any shape, such as a rectangular cross-sectional shape, by using a similar method.

In this invented manufacturing method, the metal plate 9 is not limited to oxygen-free copper, but is also made of Cu, which is usually used as a stabilizing material for superconducting wires.
, Al, At or metals mainly containing these, stainless steel as a reinforcing material in the case of compound-based superconducting wires,
Ta, Nb, alloys thereof, or composites thereof may be used as a diffusion barrier.

Among composite materials, when Ta, Nb or their alloys and Cu form a laminated structure, AI, At
Compared to , Cu has higher strength, so it is easier to reduce the size. l19, which provides a barrier and stabilization for Cui
Longer superconducting wires can be manufactured that include.

Of course, after processing the barrier into a piezo shape so as to surround the wire bundle body 7, Cu 1i is further formed to surround this.
k! Even if it is processed into a 't' rib shape, the same process as described above can be carried out.

Furthermore, in the above embodiments, Nb-Ti alloy superconducting wire was explained, but Nb-Ti-Ta alloy t and Nb-Ti alloy superconducting wire were explained.
Multi-component alloy containing b -Tj f, Nb38n*VzG
a + NbzAt+V1Si, Nb1Ga,
It can also be used to manufacture superconducting conductors such as V, Hf, V, (HfZr), etc. Particularly in the case of Nb38n compound superconducting wire, when applying it to a wire produced by a manufacturing method in which Nb or Nb alloy, Sn or Sn alloy is integrally processed to reduce the cross section with Cu or Cu alloy arranged around it, such a method is necessary. Since the composite material does not contain high-strength constituent materials, the wires are less likely to break during the subsequent cross-sectional reduction process, making it easier to manufacture a large current capacity superconducting conductor in a desired shape.

By the way, there is a fact that when the proportion of an in the Nb38n superconducting wire is increased, the critical current value increases.
Adhering Sn or Snn alloy to the surface of the n superconducting edge,
When this invention is processed using this as a wire bundle, 5ni
lt can be easily increased, and a long Nb38n superconducting wire with better performance can be obtained. In addition, it is well known that when strain is applied to compound superconducting iK, the critical current value decreases among superconducting wires, and as mentioned above, the reason why the material of the metal plate is stainless steel is to reduce the stress effect. This is one of the devices for mitigation, and it is attached to the edge material for the purpose of completely reinforcing the stainless steel, but when the entire manufacturing method of this invention is adopted, part of the wire bundle 7 is replaced with a gold stainless steel wire or tungsten wire. A long, high-strength wire rod can be easily obtained by simply using this method.

According to the invention described above, in order to enclose an unaligned wire bundle including a superconducting A highly stable, high-current superconductor is created by hard bonding to obtain a composite, and then subjecting it to cross-section and reduction processing such as drawing to the extent that the strands within the composite conductor do not break. It has the effect of being able to manufacture conductors in a simple manner across the entire industry.

[Brief explanation of the drawing]

Figure 1 shows the cross section of a monolithic superconductor, Figure 2 (a
), (b) is the cross-sectional thickness of the conventional large current superconducting conductor,
The figure shows an embodiment of an apparatus for carrying out the manufacturing method of the present invention. 7... Wire bundle containing superconducting wire, 8... is a bottle, 9
...Normal conductive metal plate, 10... Devin, 11...
Roll group, 12... Electrode rod, 13... Gevin. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A method for manufacturing a superconducting conductor in which a plurality of metals or alloys are bundled and subjected to cross-section reduction processing, in which an unaligned edge bundle containing a superconducting element @ is entirely surrounded. The process of processing a metal plate into 4-ide shapes. Thereafter, the method for manufacturing a composite super 1M4 conductor is characterized by comprising the step of reducing the cross section of the strands within a range where the strands are not broken. (2) Method 8 for manufacturing a composite superconducting conductor as described in Patent No. 2. The method for producing a composite superconducting conductor according to claim 1, wherein the material is Ta or Ta alloy, Nb or Nb alloy, or a composite material thereof. (4) The method for manufacturing a composite superconducting conductor according to claim 1, wherein the metal plate is made of stainless steel or a warped composite material. (5) The metal plate is Ta, T'a alloy, Nb or Nb
2. The method for manufacturing a composite superconducting conductor according to claim 1, wherein the alloy and Cu have a product of lIi'g4. (6) Process the Nb plate, Nb alloy plate, Ta plate, or Ta alloy plate into a T-pipe shape so as to completely surround the IVi1 bundle, and further process Cu4N into a pipe shape to surround this mother plate. A method for manufacturing a composite superconducting conductor according to claim 1. (Claims 1 to 3) characterized in that after the metal plate is processed into a pipe shape, the same edges of the pipe are joined together.
6. A method for producing a composite superconducting conductor according to item 6. (8) Metal sheet metal - Processed into a g-beam shape and then processed into a small cross-section without joining the opposing edges 1 of the pipe? (9) A patent claim characterized in that the superconductor specialty is a Nb-Ti alloy superconducting strand. A method for producing a composite superconducting conductor according to Items 1.2 and 7.8. A method for manufacturing a composite superconducting conductor according to claim 1.2, 7.8, characterized in that it is a θQM conductive element wire b-Ti-Ta alloy superconducting element wire. aυMill14 element llMd: Nb3Sn, V3
Ga, Nb3At, V3Si. Nb, Ga, V, Hf, or V2(E4f-Z
r) A method for manufacturing a composite 8@ conductor according to claims 1 to 8, characterized in that it is a superconductor xi. 0 superconducting wire is Nb or Nb alloy rod and Sn or S
The bed superconductor 24 of Claims 1 to 8 is characterized in that it is an Nb3Sn superconducting compound formed by arranging an n-alloy rod and a gold-Cu or Co-alloy around the periphery and reducing the cross-section of the n-alloy rod and the gold-Cu or Co alloy. How the body is manufactured. The superconducting line is an Nb1Sn superconducting agricultural line in which Sn still remains and all of the sn alloy is attached to the surface of a composite material consisting of only a portion of Nb or Nb alloy, Cu or Cu alloy, Sn or sn alloy. Claims 1 to 8
A method for manufacturing a super #L conductor using ridge-gluing. (14+!! The bundle is a superconducting material) A composite wire according to claims 1 to 8 and 11 to 13, characterized in that the bundle is a metal or alloy wire having a high tn mechanical strength. A method for manufacturing superconducting conductors.