SU1590051A3 - Method of producing continuous superconductor - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to methods for producing superconductors based on high-temperature superconducting oxide compounds. The purpose of the invention is to expand the technological capabilities of the method by increasing the homogeneity of the core structure. The method consists in that the oxide powder 8, which acquires superconducting properties at 100 K and above, is continuously fed to the surface of a moving longitudinally metal band 3 made of an oxygen-permeable metal. The tape with the powder deposited on it is rolled up to the contact of the edges, after which the latter are welded to form a blank and deform it to the required size. 1 il.

Description

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The invention relates to electrical engineering, in particular, to methods for producing superconductors based on high-temperature superconducting 1 {their oxide compounds.

The purpose of the invention is to expand the technological capabilities of the method by increasing the homogeneity of the core structure. .

The drawing shows a diagram of the device that implements the described method.

The method consists in the fact that the oxide powder, which acquires superconducting properties at 100 K and above, is continuously fed to the surface of a metal tape moving longitudinally in one direction, made of an oxygen-permeable metal, the tape with the powder applied on it is rolled up to the edges touching then the last cBapir, forming a billet in the form of a tubular metal sheath with an arranged core of finely dispersed superconducting powder. The resulting billet is deformed to the required size. Powdered mixtures of oxides, which are referred to as: ayut also high-temperature superconducting - ceramic materials, with proper use and appropriate heat treatment, have superconductivity at 100K and higher. Such high critical temperatures allow liquid nitrogen to be used as a means of cooling and significantly increase the efficiency as compared to those used up to Si1: then cooled with gels. Conclusion of the mixture of oxides in the metal shell in this method contributes to the production of superconductors of almost unlimited length. The sheath itself serves as a mechanical support, especially at the joints and connections, as well as a normal stabilizing electrical conductor.

A mixture of oxides, i.e. The so-called ceramic material contains copper, lead or bismuth. For the composition of a superconductor, the presence of at least one of the elements of group II and group III of a periodic system of elements is essential. From the 11th group it is, preade all, strontium and barium, which in combination with elements III

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Groups, such as yttrium and lanthanum, ensure the achievement of a high critical temperature. Until, on time. or after the powdered mixture of oxides is placed in the preform, it can be heat treated. Heat treatment should be carried out at temperatures from 850 to 1650 C, preferably at 1000-1500 ° C. If heat treatment is carried out during or after the preparation of the preform, then metals with a high melting point should be used as the shell material. It is advisable to provide a sheath of oxygen-permeable metal or alloy. For example, silver or an alloy of silver is suitable.

The reduction of the cross-section of the resulting billet is advisable to carry out to such an extent that this would achieve a mechanical seal of the powder mixture of oxides.

Example. From the drum 2 mounted on the bed 1, the metal tape 3, made, for example, of silver, through a deflecting device 4, which, if necessary, also serves to clean the tape, is brought to the machine unit 5. Within this unit, with the help of a forming unit; using deaxially adopted rollers or rolls, the metal tape 3 is shaped like a TTube 6. In the tube 6, which is still open from above, a powder-like mixture of oxides 8 is introduced using a transport device 7, for example La-Sr-Cu-0; Ba-Pb-Bi-0; Ba-La-Cu-0; Y-Ba-Cu-0. With the further passage of 1ent through the installation 5, its edges are welded using a welding apparatus 9 to form a blank, which, passing through the sizing tool 10, is reduced in its cross section. With the help of subsequent calibration devices 11, the cross-section is reduced to 6 as long as a sufficient compaction of the powder particles 8 is achieved. If necessary, heat treatment can then be carried out.

The proposed method allows to obtain almost unlimited length superconductors based on high-temperature superconducting compounds with a high composition homogeneity along the length of the wire.

51590051

Claims (1)

The invention of the quality of the specified powder using a method of manufacturing a lengthy oxide oxide powder, acquiring superconductor, in which the formation-superconducting properties at 100 K and a billet in the form of a tubular metal above, is fed, it is fed continuously to the surface shell with a positioned longitudinally moving in the same core from the finely dispersed direction of the metal tape, superconducting powder, after chewing the oxygen permeable it is deformed to the required metal, the tape is rolled up from the deposited size, which differs by JQ n1m on it with a powder to the contact surface the fact that, in order to expand the technology of its edges, after which the last of the potential of the plant by welding, forming the indicated pre-uniformity of the core structure, WY.