Manufacturing of titanium-bronze processed multifilamentary Nb/sub 3/Sn conductors

Conference · Fri Mar 01 04:00:00 EST 1985 · IEEE Trans. Magn.; (United States)

OSTI ID:6484979

Kamata, K; Fujinaga, T; Itoh, K; Moriai, H; Tachikawa, K; Tada, N

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-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG21:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
BRONZE
COPPER ALLOYS
COPPER BASE ALLOYS
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
DRAWING
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROMAGNETS
EQUIPMENT
FABRICATION
FILAMENTS
MAGNETIC FIELDS
MAGNETS
MATERIALS WORKING
MORPHOLOGY
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
SUPERCONDUCTING WIRES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TIN ALLOYS
TITANIUM ALLOYS
WIRES