Siemens Aktiengesellschaft

Vacuumschmelze Gmbh

Manfred Wilhelm

Bernhard Roas

Gunther Ziegler

Sigrun Frohmader

Karl Wohlleben

Helmut Helldorfer

Dietrich Hauck

Alexander Jenovelis

Process for producing an elongated superconductor with a bismuth phase

A composite superconductor comprises a matrix of an alloy which is normally conductive at operating temperatures with the alloy being copper and another alloying element. Several superconducting filaments are embedded in the matrix with these filaments being formed by a diffusion reaction between at least two elements. An aluminum jacket surrounds the matrix. A barrier layer formed from at least one intermetallic copper-aluminum compound is disposed between the aluminum jacket and the alloy matrix. The aluminum jacket may be formed by extrusion at an elevated temperature with the boundary layer between the aluminum jacket and the alloy matrix being concurrently formed by diffusion.

Composite superconducting conductor with several conductor strands and a

Disclosed herein is a method for manufacturing a superconductor with a superconductive intermetallic compound by means of techniques employing solid-state diffusion in a heat treatment, wherein, in order to increase the effective current density and the critical current of such a superconductor, either the heat treatment for forming the superconductive compound is carried out in a hydrogen atmosphere, or, alternatively, a thermal post-treatment is carried out in a hydrogen atmosphere after the heat treatment for forming the superconductive compound is performed.

Method for the manufacture of a superconductor containing an

A method for the manufacture of a superconductor with a superconductive intermetallic compound consisting of at least two chemical elements in which a ductile structural part made of at least one element of the compound is brought into contact with a second structural part which contains a ductile carrier metal for the remaining elements of the compound after which the remaining elements of the compound are admitted to the second ductile structural part through a chemical transport reaction at elevated temperature, the compound being formed by a reaction of its remaining elements, diffusing through the second structural part, with the first structural part.

Method for the manufacture of a superconductor with a superconductive

The invention concerns a method for the manufacture of a superconductor which comprises a superconductive, intermetallic compound including at least two elements. A ductile component of at least one element of the compound is brought into contact with a ductile carrier metal bearing the other elements of the compound. The structure so obtained is heat-treated in a vapor formed over a separate melt of the elements found in the carrier metal in such a manner that the intermetallic compound is formed through reaction of the vapor, diffusing through the carrier metal, with the ductile component. The heat treatment applied until the ductile components and the other elements reach the same temperature is performed in a vacuum with a residual maximum gas pressure of 10.sup.-.sup.2 Torr or in an inert gas at a maximum gas pressure of 500 Torr.

Method for the manufacture of a superconductor

A method of manufacturing a superconductor having a superconductive intermetallic compound of at least two elements in which a ductile component consisting of one element of the compound is brought into contact with a second component consisting of an alloy containing a ductile carrier metal and the remaining elements of the compound, after which the two components are subjected to a cross section reducing process and then heat treated such that the compound is formed through a reaction of the first component with the elements of the compound contained in the second component.

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Nurnberg, Germany

Manfred Wilhelm