DE1640506B1 - METHOD FOR MANUFACTURING A COMPOSITE ELECTRICAL CONDUCTOR - Google Patents

Description

1 2

The invention relates to a method for manufacturing copper containers packed, as can be seen from FIG. 2 results, development of a composite electrical conductor This copper container is also sealed by joint mechanical processing of min- and extruded and / or drawn to a wire at least one of a number of elements or the final dimensions desired from a ductile superconductor material with 5, which is shown in FIG. 3 is shown. The wire is one Ductile usual material of high electrical thus consists of a number of threads 5 of the supra-conductivity and high thermal conductivity to conduct on conductive material, which in a mass C of

in this way a plurality of ribbons, threads or copper are embedded.

Laying the superconductor material in a bulk. An advantage of this method is that

of the usual material. ίο here the difficult operation of pulling the

From the British patent specification 952 226 it is composed of the superconducting material EIe-

knows, a composite superconductor material da- ments with copper is avoided. Another advantage

by producing that the actual superconductor part is that it is not necessary that

consisting of molybdenum-rhenium or bismuth-lead rods arrange in a specific pattern

with a ductile material of high electrical conductivity 15 must in order to achieve that each rod is made of

ability and high thermal conductivity, such as silver, the superconducting material surrounded by copper Gold or copper, coated and then cold worked, because this rod is already covered with copper

is provided in this way the assembled one before the assembly is done, where-

Superconductor material in the desired thickness ensures that a good connection

place. The creation of such assemblies between the superconducting material and copper

ter superconductors, for example in the form of fine ones. Through this improved way of working

Wires of good stability, is by simple cold it is possible to change the ratio of the cross-sectional area λ

machining very difficult. The invention will change from copper to superconducting material \

who have now overcome these difficulties. to be able to by the thickness of the copper coating in

According to the invention, this object is achieved by the hexa-

solves that the common mechanical processing gonal rod is changed,

of the superconductor element or the superconductor layer The pressing out of the blank during the pretreatment

with a ductile usual electrically conductive mulling takes place at a temperature below that

material at least initially at an elevated temperature at which a eutectic forms, d. H. at a

temperature is carried out, which is high enough to 30 temperature from 350 to 550 ° C and preferably

a connection between the superconductor material between 400 and 500 ° C. The further processing

and the usual material, but then takes place at room temperature. The pole

is below the temperature at which a low assembly in the copper container will then

melting eutectic between the superconductor - also at a temperature below the eutectic

material and the usual material is formed. 35 table temperature, preferably at 200 to 450 ° C

In the following, the invention is expressed with reference to the figure, and then a stretching treatment is carried out

ren explained in more detail, namely shows carried out at room temperature. The squeezing

Fig. 1 is an end view of an assembly and stretching or pulling are the preferred means

element from the superconductor and common methods of mechanical processing, however,

other methods, such as stan-

Fig. Figure 2 is an end view of an assembly of counter rollers may be used if desired;

the individual elements of FIG. 1 and The hexagonal rods make it possible to

F i g. 3 achieve an enlarged cross-section of the product special tight packing arrangement, however

tes that can be produced from the assembly of Fig. 1 for this purpose also square, round or right (

has been presented. 45 angular cross-sectional shapes can be used.

In all of the figures, the superconducting material is In another embodiment of the invention

rial shown hatched. there is only one stretching treatment instead of one

As can be seen from the drawings, there is a pressing and stretching treatment. For example,

cast blank from the superconducting material, wise the superconducting alloy melted and

for example a niobium alloy with 44% titanium 50 then forged into a round blank or in

forged into a tubular container made of high-purity copper and plate form and formed into a round raw

fer introduced, which rolled a high electrical conductivity ling. This blank is then, as before,

at very low temperatures, for example in the container made of the usual material, for example

4.2 ° K. The ends of the container are made of high purity copper, inserted and referenced

closed and the container can be evacuated and required- 55 the container is closed and evacuated, although

possibly be welded, but this is not essential to these last two stages of work

not necessary, provided the surfaces that are connected.

The container and the blank it contains are necessary. The pressing or drawing of this mate- rial is then carried out at a temperature between 350 to rials are then passed for the purpose of being stretched around the 60,550 ° C, i.e. H. at a temperature that central blank made of the superconducting material is below that at which a eutectic to connect with copper. This wire or which is formed. It creates one with a copper rod is an assembly element and consists of a covered bar in which the two components Core 5 made of superconducting material are connected to one another in a th. At the same time will Copper sleeve C, so that the superconducting material 65 verrial the cross-sectional area by this processing is provided with a copper coating, as it turns out from and the length of the two components ver-F i g. 1 results. The wire or rod is then enlarged. Since in this work stage a stretching treatment Cut lengths and tightly in another lung instead of an extrusion treatment,

can easily handle larger sizes of the copper containers with the blanks of the superconducting material will. This means that greater lengths of wire can be made from each container and blank can be. The larger blanks can be melted, forged and closed without difficulty Bars are rolled.

The copper-coated rod is then drawn at room temperature to a A composite superconductor having a single core, preferably of hexagonal cross-section to surrender. A number of lengths of the same are then put into a container of very pure Introduced copper, which is then preferably sealed and evacuated. The container and its contents are then drawn to a compound at a preferred temperature range of 350 to 550 ° C of the elements and a reduction in cross-sectional areas, followed by another The stretching treatment takes place at room temperatures to give the final product which-

• ches from a multi-core compound Superconductor.

In other embodiments, one of the components can be plated onto the other component will. For example, the superconducting cores with copper in a sufficient Starch can be plated to act as a mass, and the cores are then put together, for example by winding or spooling, whereupon this assembly in the described Way is edited. In another form of composite material, the components be in powder form and compacted into a suitable shape and then machined. if in the processes described above, sheet-like or strip-shaped superconducting material in composite Form is used, the sheet metal or the strip with slots in the longitudinal direction be provided so as to form a larger number of threads.

Instead of using the elements of the assembly to

»Position of the assembled conductor in a fixed form apply, in another embodiment, the cores of the superconducting material can also be used in a mold can be used, which is then filled with copper. This assembly will then squeezed out, wherein it can initially be inserted into a corresponding sleeve, if desired. at This method gives you considerable freedom as to the various types of shapes and forms Arrangement of the shapes of the cores made of the superconducting material.

A copper block can also be used, which has corresponding openings or bores has into which the superconducting material is used. Such a block can be a casting or a piece of machining material in which the openings are machined. To After inserting the cores of the superconductor, this composite work piece is then in the above specified mass further processed.

Claims (11)

Patent claims: 1. Method of manufacturing a composite electrical conductor by common mechanical processing of at least one of a plurality of elements or layers from a ductile superconductor material with a ductile conventional material of high electrical Conductivity and high thermal conductivity to this way a plurality of ribbons, threads or to enclose layers of the superconductor material in a bulk of the conventional material, characterized in that the joint mechanical processing of the superconductor element or the superconductor layer with the usual ductile electrically conductive material is performed at least initially at an elevated temperature high enough is to bring about a connection between the superconductor material and the usual material, however, is below the temperature at which a low-melting eutectic is between the superconductor material and the usual material is formed. 2. The method according to claim 1, characterized in that the at high temperature mechanical processing carried out by pressing, rolling, bar rolling, forging, Drawing or drop forging takes place. 3. The method according to claim 1 and 2, characterized in that the ductile superconducting Material consists of a niobium alloy with 67 weight percent titanium. 4. The method according to claim 1 and 2, characterized in that the superconducting material consists of a niobium alloy with 44 weight percent titanium. 5. The method according to claim 3 or 4, characterized in that the superconducting alloy is subjected to a solution treatment above 700 ° C and then quenched. 6. The method according to claim 4 or 5, characterized in that the composite electrical conductor is subjected to a heat treatment at 100 to 700 ° C in order to precipitate a fine disperse phase or phases. 7. The method according to claim 6, characterized in that the heat treatment at 250 up to 450 ° C. 8. The method according to claim 4 or 5, characterized in that the composite electrical Head of heat treatment at 200 to 500 ° C before or after processing Is subjected to room temperatures. 9. The method according to claim 8, characterized in that the heat treatment at 300 up to 450 ° C. 10. The method according to any one of the preceding claims, characterized in that the ductile Ordinary material made of at least one of the metals copper, aluminum, silver, iridium and cadmium. 11. Method of making a composite Electrical conductor according to Claim 1, characterized in that initially a blank made of ductile superconducting material in a container made of a ductile ordinary Material of high electrical and thermal conductivity is introduced into this blank and the container is then pressed or pulled at 350 to 550 ° C and finally again at Is extruded or drawn from room temperature to form an assembly element which a number in a container from one ductile ordinary material of high electrical and thermal conductivity is introduced, so as to give an assembly that is pressed or drawn at 200 to 450 ° C and finally pressed out and / or drawn again at room temperature. 1 sheet of drawings