Manufacturing of titanium-bronze processed multifilamentary Nb/sub 3/Sn conductors
It has been revealed that small amount of titanium addition to the bronze matrix is most effective for improving the high-field current-carrying capacities of bronze-processed multifilamentary Nb/sub 3/Sn conductor. Multifilamentary Nb/Cu-7.5at%Sn-0.4at%Ti round wires with 4-5 ..mu..m-diam 31x331-cores fabricated through drawing process only showed the overall critical current density Jc(overall) over 3.5 x 10/sup 4/ A/cm/sup 2/ at 15 T after the heat treatment at 690/sup 0/C for 200 hr. It was also shown that the critical current anisotropy became larger with increasing aspect ratio of the rectangular shaped multifilamentary Nb/Cu-7.5Sn-0.4Ti conductors. Rectangular shaped 5 ..mu..m-diam 31x361-core Nb/Cu-7.5Sn0.45Ti conductors prepared through double extrusions showed about the same tendencies in the aspect ratio dependence of I /SUB c/ (H /SUB II/ ) as those prepared through drawing process only, after the heat treatment at 690/sup 0/C for 200 hr. 9.5 mm wide and 1.8 mm thick Nb/Cu-7.5Sn-0.4Ti conductors with 5 ..mu..m-diam 349x361-cores have been successfully fabricated in full production scale through three steps hydrostatic extrusion process. These rectangular shaped practical multifilamentary Ti bronze Nb/sub 3/Sn conductors make feasible to generate a central magnetic field over 16 T in the 190 mm winding inner diameter intermediate coil of the 18 T superconducting magnet at NRIM.
- Research Organization:
- Metal Research Laboratory, Hitachi Cable, Ltd., Tsuchiura-shi, Ibaraki-ken
- OSTI ID:
- 6484979
- Report Number(s):
- CONF-840937-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. MAG21:2; Conference: Applied superconductivity conference, San Diego, CA, USA, 9 Sep 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
36 MATERIALS SCIENCE
SUPERCONDUCTING WIRES
DRAWING
BRONZE
CRITICAL CURRENT
CURRENT DENSITY
FILAMENTS
MAGNETIC FIELDS
MORPHOLOGY
NIOBIUM ALLOYS
SUPERCONDUCTING COILS
SUPERCONDUCTING MAGNETS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TIN ALLOYS
TITANIUM ALLOYS
ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROMAGNETS
EQUIPMENT
FABRICATION
MAGNETS
MATERIALS WORKING
PHYSICAL PROPERTIES
SUPERCONDUCTING DEVICES
WIRES
420201* - Engineering- Cryogenic Equipment & Devices
360101 - Metals & Alloys- Preparation & Fabrication
360104 - Metals & Alloys- Physical Properties