University of California

The United States of America As Represented by the Department of Energy

John F Bingert

Terry G Holesinger

Dean E Peterson

Peter R Roberts

Yuntian Theodore Zhu

Paul S Dunn

R Alan Patterson

Haskell Sheinberg

William Michels

Patrick S Baldonado

David A Korzekwa

Dan J Thoma

Sherri A Bingert

Mary Ann Hill

A high temperature superconducting composite conductor is provided including a high temperature superconducting material surrounded by a noble metal layer, the high temperature superconducting composite conductor characterized as having a fill factor of greater than about 40. Additionally, the conductor can be further characterized as containing multiple cores of high temperature superconducting material surrounded by a noble metal layer, said multiple cores characterized as having substantially uniform geometry in the cross-sectional dimensions. Processes of forming such a high temperature superconducting composite conductor are also provided.

High temperature superconducting composite conductor and method for manufacturing the same

An improvement in a process of preparing a composite high temperature oxide superconductive wire is provided and involves conducting at least one cross-sectional reduction step in the processing preparation of the wire at sub-ambient temperatures.

Cryogenic deformation of high temperature superconductive composite structures

Superconductor tapes are annealed under uniaxial pressure, such a compressive annealing yielding significant improvement in the resultant critical current density. This thermomechanical processing technique obtains improved critical currents with fewer processing steps.

Compressive annealing of superconductive tapes

A process of preparing a titanium-tantalum alloy including forming a suite mixture of essentially pure titanium powder and essentially pure tantalum powder, melting the mixture of titanium powder and tantalum powder by plasma torch melting under a pressure greater than atmospheric pressure to form a titanium-tantalum solution, and casting the molten solution of titanium-tantalum to form a solid homogeneous titanium-tantalum product is disclosed. The process can further include hot-rolling the cast solid homogeneous titanium-tantalum product to form a sheet of the titanium-tantalum product.

Titanium-tantalum alloys

The present invention provides a method of producing high-strength and high-conductance copper and silver materials comprising the steps of combining a predetermined ratio of the copper with the silver to produce a composite material, and melt spinning the composite material to produce a ribbon of copper and silver. The ribbon of copper and silver is heated in a hydrogen atmosphere, and thereafter die pressed into a slug. The slug then is placed into a high-purity copper vessel and the vessel is sealed with an electron beam. The vessel and slug then are extruded into wire form using a cold hydrostatic extrusion process.

Hydrostatic extrusion of Cu-Ag melt spun ribbon

A superconductive article is made by inserting a rigid mandrel into an internal cavity of a first metallic tube, said tube having an interior surface and an exterior surface, said interior surface defining the interior cavity, forming a layer of a superconductive material or superconductive precursor upon the exterior surface of said first metallic tube, machining the layer of superconductive material or superconductive precursor to a predetermined diameter to form an intermediate article configured for insertion into a second metallic tube having an interior diameter corresponding to the predetermined diameter, inserting the machined intermediate article into a second metallic tube having an internal diameter corresponding to the predetermined diameter of the intermediate article to form a composite intermediate article, reducing or ironing the composite intermediate article to a predetermined cross-sectional diameter, and sintering the reduced or ironed composite intermediate article at temperatures and for time sufficient for the superconductive material or superconductive precursor to exhibit superconductivity.

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Jemez Springs, NM, United States of America

John F Bingert