On the optimization of in situ Nb/sub 3/Sn-Cu wire

Conference · Fri Jan 01 04:00:00 EST 1982 · Adv. Cryog. Eng.; (United States)

OSTI ID:6018020

Sue, J J; Finnemore, D K; Gibson, E D; Ostenson, J E; Verhoeven, J D

The critical current density values of in situ Nb/sub 3/Sn-Cu wire can be improved by employing an optimum area reduction ratio in reducing the Cu-Nb ingot to wire size. Increasing the Sn diffusion temperature from 550 to 650 degrees Centigrade does not increase either the critical current density or the upper critical field but only succeeds in shifting the optimum ratio to lower values. Second, the use of C containers in the casting step of in situ wire causes significant C contamination to produce a significant decrease in the critical current density properties. Third, the twelve-T critical current densities of C-free in situ wire produced with optimum reduction ratios are as good or better than the best reported values on powder-prepared in situ and bronze-processed wires. Fourth, the maximum critical current densities found for in situ wire prepared from small laboratory-scale castings can be duplicated in consumable arc castings scaled up to 15 kg through the use of Zro/sub 2/-coated graphite liners. Specifications for the wires used are given.

• Research Organization: Iowa State University, Ames, IA
• OSTI ID: 6018020
• Report Number(s): CONF-810835-
• Conference Information: Journal Name: Adv. Cryog. Eng.; (United States) Journal Volume: 28
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
COPPER ALLOYS
CRITICAL CURRENT
CRYOGENICS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
IN-SITU PROCESSING
NIOBIUM ALLOYS
OPTIMIZATION
PHYSICAL PROPERTIES
PROCESSING
SUPERCONDUCTING WIRES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TIN ALLOYS
WIRES