The effect of magnetic impurities and barriers on the magnetization and critical current of fine filament NbTi composites

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5743168

Ghosh, A K; Sampson, W B; Gregory, E; Kreilick, S; Wong, J

It has been shown that the highest critical currents in fine filament NbTi conductors are obtained when the filaments are closely spaced. However, the filaments in a composite with a high purity copper matrix tend to be coupled via the ''proximity effect'' as the filament spacing is reduced leading to large magnetization at low fields. To reduce the ''proximity'' coupling, trial billets of NbTi have been fabricated with Cu-30% Ni matrix, Cu-0.5% Mn matrix and one with a Ni barrier around the filaments. Wires drawn from these billets have shown that this interfilament coupling can be suppressed for very small filament separations. A full sized commercial billet with Cu-0.5% Mn matrix demonstrates that high J/sub c/ conductors with filament size approx.1 to 5 ..mu..m can be fabricated which show no interfilament coupling at low fields.

• Research Organization: Brookhaven National Lab., Upton, NY (USA); Supercon, Inc., Shrewsbury, MA (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5743168
• Report Number(s): BNL-40543; CONF-870901-23; ON: DE88004443
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
COMPOSITE MATERIALS
COPPER ALLOYS
CRITICAL CURRENT
CURRENTS
DATA
ELECTRIC CURRENTS
EXPERIMENTAL DATA
FABRICATION
IMPURITIES
INFORMATION
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MANGANESE ALLOYS
MATERIALS
NICKEL ALLOYS
NIOBIUM ALLOYS
NUMERICAL DATA
PHYSICAL PROPERTIES
SUPERCONDUCTING COMPOSITES
TITANIUM ALLOYS