Alcatel

Alcatel Alsthom Compagnie Generale D'electricite

Nexans

Societe Anonyme Dite: Compagnie Generale D'electricite

Societe Anonyme Dite:alsthom

Denis Legat

Peter Friedrich Herrmann

Albert Leriche

Gerard Duperray

Erick Beghin

Patrick Dubots

G&eacute;rard Duperray

Jean-Pierre Tavergnier

Raymond Vic

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

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 sheathed twisted superconductor with a high critical temperature is made from a billet obtained by assembling square cross-section single strands in a square cross-section metal tube. The multistrand obtained by drawing the billet through a roller die is twisted with a particular lay and rolled using rollers the diameter of which is much greater than the twist lay. The sheathed twisted superconductor obtained by this method is intended for variable current applications.

Method of manufacturing a sheathed twisted superconductor having a high

In a method for the manufacture of an encased high critical temperature superconducting wire by the 'powder in tube' method, prior to the introduction of a compressed rod of superconducting material into a silver tube, the rod is heat treated so that grains of unwanted phase are reabsorbed. The tube can be drawn more easily, and strands can be produced with a regular geometry and no defects. The wire is constituted by 15 .mu.m to 20 .mu.m thick filaments (30) with a form factor of more than 60.

Method of manufacturing an encased wire of high critical temperature

A superconducting strand comprises a central superconducting filament (1), a covering (2) of oxide for ensuring sufficient oxygen pressure around the filament (1), a layer of cladding (3) made of aluminum, an alloy of copper and aluminum, or of stainless steel, a layer of cladding (4) made of niobium, of tantalum, or of vanadium, and an outer covering of copper (5).

Composite superconducting strand having a high critical temperature, and

The method is intended to provide cables (10) having an optical fiber (1) and suitable for mechanically severe environments, while remaining small in section. Heretofore, the mechanical strength of optical fiber cables has been obtained by plastic structures of considerable cross-sectional area and reinforced by metal strands or by glass fibers. In the method of the present invention, the reinforcing is obtained by metal composites (3) having very high mechanical strength and very small diameter, said composites extending parallel to the fiber (1).

Method of manufacturing an optical fiber cable and a cable obtained by

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Lisses, France

Denis Legat