Multifilament superconductor strand having an anti-diffusion barrier layer

US5104745A · kind A · utility

Assignee

• GEC Alsthom T&D SA · FR

Inventors

• Julian Cave · Paris, FR
• Thierry Verhaege · Longjumeau, FR

Key dates

• Filing date: Jul 6, 1990
• Grant date: Apr 14, 1992
• Expiry date: Jul 6, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12819

Abstract

A multifilament superconducting strand for use at industrial frequencies and made from an initial billet comprising a superconducting core niobium-titanium alloy surrounded by an anti-diffusion barrier layer which is in turn surrounded by a copper based matrix material, with the strand being made from the billet by successive stages of extrusion, wire-drawing, and assembly, wherein the strand includes 5.times.10.sup.5 to 5.times.10.sup.6 filaments each constituted by the superconducting core reduced to a diameter in the range 50 nm to 150 nm, the filaments being separated from one another by a distance lying in the range 30 nm to 100 nm, which distance is occupied by the anti-diffusion layer and the matrix material. The matrix material contains in excess of 8% manganese when the anti-diffusion layer is made of niobium, or alternatively, the anti-diffusion layer may be of an iron-containing alloy with the matrix containing copper and nickel.