Method for producing a superconductive element

US7476281B2 · kind B2 · utility

Assignee

• Bruker Biospin GmbH · DE

Inventors

• René Fluekiger · Plan-les-Ouates, CH
• Vital Abaecherli · Niederrodenbach, DE

Key dates

• Filing date: Sep 12, 2005
• Grant date: Jan 13, 2009
• Expiry date: Nov 25, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49014

Abstract

A method for producing a superconductive element, in particular a multifilament wire, starting from a composite (1) comprising a bronze matrix containing Cu and Sn, in which at least one elongated structure containing Nb or an Nb alloy, in particular NbTa, is embedded, whereby in a first step the composite is extruded at a temperature between 300° C. and 750° C., followed by cold or hot working and annealing steps in which the composite is elongated in parallel to the elongated structure and softened by a temperature treatment (=“intermediate annealing”), followed by a stacking step, in which a multitude of elongated composites from the preceding cold or hot working steps are bundled, the steps of extruding, elongating, annealing and stacking being repeated one or more times, followed by a final elongating process, including intermediate annealing processes, in which the composite is elongated to its final length, the superconductive phase being obtained by a heat treatment including a solid state diffusion reaction is characterized in that at least part of the elongating steps and annealing steps are performed by cold working preceded by an intermediate annealing between 520° C. a…