Alcatel

Nexans

Gec Alsthom Sa

Albert Leriche

Peter Friedrich Herrmann

Denis Legat

G&eacute;rard Duperray

Gerard Duperray

Erick Beghin

Jean-Pierre Tavergnier

Alain Fevrier

Fernand Grivon

Peter Herrmann

Method of decoupling an HTc superconductive multi-filament strand having a silver-based matrix, and a multifilament strand made thereby

The invention relates to a powder in tube type method of manufacturing an HTc superconductor multifilament conductor having a matrix of compatible silver alloy and in which, during preparation of the multifilament billet, the number of segments per layer is organized so that, in cross-section, the segment layers viewed as a whole have the general shape of a converging-diverging nozzle, the throat of the converging-diverging nozzle shape being substantially contained in said superposition midplane; and in which, during the mechanical treatment of said multifilament billet preceding the synthesis heat treatment, a rolling force is applied in a direction perpendicular to the superposition midplane, and at least one of the side edges of the rolled billet is cut off perpendicularly to the superposition midplane, thereby revealing the matrix of compatible silver alloy.

Method of making superconductor strand

Method of decoupling an HTC superconductive multifilament strand having a silver-based matrix, and a multifilament strand made thereby

A process for texturing an HTc superconductor of the matrix type based on silver and the superconductor material (Bi.sub.1-x Pb.sub.x).sub.2 Sr.sub.2 Ca.sub.y Cu.sub.1+y O.sub.6+2y where x.epsilon.[0; 0,4] and y.epsilon.{0, 1, 2} includes the following steps carried out in succession: raising the temperature of the superconductor from room temperature to the melting point of the superconductor material, maintaining the temperature of the superconductor constant at the melting point of the superconductor material for a relatively short period, varying the temperature of the superconductor between the melting point of the superconductor material and its synthesis temperature, maintaining the temperature of the superconductor constant at the synthesis temperature of the superconductor material for a relatively long period and reducing the temperature of the superconductor from the synthesis temperature of the superconductor material to room temperature. The step of varying the temperature of the superconductor between the melting point of the superconductor material and its synthesis temperature comprises sudden cooling of the superconductor from the melting point of the superconductor material to an end of cooling temperature less than the synthesis temperature of the superconductor material, and raising the temperature of the superconductor from the end of cooling temperature to the synthesis temperature of the superconductor material.

Process for texturing an HTc superconductor and superconductor made by

A method of connecting a high critical temperature superconductive ceramic part and a low critical temperature superconductor such as a multifilament strand of niobium-titanium, in which method a silver contact is prepared on said ceramic part, wherein said multifilament strand is soldered to said contact using an intermediate solder material whose melting temperature is less than 300.degree. C.

Method of making a connection between a high critical temperature

A method of making at least one low electrical resistance connection between a metal and a high T.sub.c superconducting ceramic part, said part being made from a ceramic powder which is placed in a mold, compressed, and sintered, wherein at least one volume of silver or gold powder corresponding to the shape of said connection and situated at the desired location is placed inside said mold in juxtaposition with said ceramic powder but without being mixed therewith, after which the compression and the sintering are performed under an atmosphere containing oxygen and at a temperature that is lower than the melting temperature of silver or gold.

Method of making a low electrical resistance connection between a metal

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Gif sur Yvette, France

Albert Leriche