Experimental investigation of copper matrix longitudinal resistance in a composite Nb-Ti wire

Conference · Fri Jul 01 00:00:00 EDT 1994 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6583116

Gubkin, I N; Kozlenkova, N I; Nikulin, A D; Polikarpova, M V; Filkin, V Ya ^[1]

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1. A.A. Bochvar Inst. of Inorganic Materials, Moscow (Russian Federation)

The longitudinal resistance of multifilamentary superconducting wires is among the major parameters used in design and optimization of superconducting magnetic systems. To enhance the conductivity of the copper matrix, it is made of pipes and rods of enhanced quality copper produced by electron beam melting (resistance ratio between two temperatures, 295 K and 4.2 K, R[sub 295]/R[sub 4.2] > 200). Yet for readily obtainable conductors this parameter is much lower. The reduction of the copper-matrix electrical conductivity may be attributed to wire-production technology involving processes such as extrusion, drawing and intermediate thermal processing, as well as to the size effect. Copper-matrix longitudinal resistance was studied as a function of wire diameter on specimens of multifilamentary Nb-Ti wire with filaments coated by a Nb layer. Experimental results are compared with the Sondheimer calculations for a monofilament conductor as well as with the Gavalloni calculations for an ideal wire with hexagonally located filaments. It has been shown that the best fit with the experiment is provided by the Sondheimer approximation. Comparison of the results of this work with other authors' data obtained for the specimens with no niobium barrier, allows the authors to single out the influence of a pure size effect and diffusion of Ti on the resistivity.

• OSTI ID: 6583116
• Report Number(s): CONF-930926-; CODEN: IEMGAQ
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 30:4Pt2; Conference: 13. international conference on magnet technology, Victoria (Canada), 20-24 Sep 1993; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
COPPER
ELECTRIC CONDUCTIVITY
MATRIX MATERIALS
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTING MAGNETS
DESIGN
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
NIOBIUM ALLOYS
SUPERCONDUCTING WIRES
TITANIUM ALLOYS
ALLOYS
COMPOSITE MATERIALS
DATA
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROMAGNETS
ELEMENTS
EQUIPMENT
EVALUATION
INFORMATION
MAGNETS
MATERIALS
METALS
NUMERICAL DATA
PHYSICAL PROPERTIES
SUPERCONDUCTING DEVICES
TRANSITION ELEMENTS
WIRES
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