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One-step internal-tin Nb/sub 3/Sn superconductor fabrication. Final report, June 1983-August 1984

Technical Report ·
OSTI ID:6450233
The object of this research is to demonstrate the feasibility of producing a Nb/sub 3/Sn superconductor in a single extrusion process with a large number of filaments with internal tin. The technique chosen uses .010'-diameter Nb and tin-plated Cu wires formed into a solenoid. The solenoid is covered with tin-plated copper foil and isostatically compacted to a pressure of 17,000 psi. The solenoid is slit along its length. This results in a ribbon about 40 inches long by about 5-inches wide, with the Nb wires running across the 5-inch-width. The ribbon is then rolled up (Jelly Roll) around a 0.5 inch diameter Ta covered copper rod to produce a composite of about 1.5 inches in diameter by 5 inches long. The composite geometry is now a cylindrical bundle of 0.010-inch-diameter Nb wire separated from each other by tin-plated copper. Each Nb wire is aligned with the axis of cylinder. The cylinder is slid into a Ta-lined copper extrusion can which is evacuated and sealed. The can is extruded at a low temperature and drawn to final wire size without intermediate annealing. The advantage of the process is that it is an internal tin process with the tin uniformly distributed through the matrix. The Nb is in a relatively soft state having been fully annealed at 0.020-inch diameter. Only one extrusion is required since the bundling technique allows a large number of wires to be precisely aligned and spaced in the matrix.
Research Organization:
Oxford Superconducting Technology, Carteret, NJ (USA)
OSTI ID:
6450233
Report Number(s):
AD-A-158444/0/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
420201 -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALIGNMENT
ALLOYS
ANNEALING
COMPACTING
COPPER
DEPOSITION
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
EXTRUSION
FABRICATION
FILAMENTS
GEOMETRY
HEAT TREATMENTS
LOW TEMPERATURE
MATERIALS WORKING
MATHEMATICS
METALS
NIOBIUM ALLOYS
PLATING
RODS
SOLENOIDS
SUPERCONDUCTORS
SURFACE COATING
TANTALUM
TIN
TIN ALLOYS
TRANSITION ELEMENTS