Critical Current Degradation of Bi-2223 Composite Tapes Induced byCyclic Deformation and Fatigue-Related Effects

Application of high temperature superconductor Bi 2 Sr 2 Ca 2 Cu 3 O x (Bi-2223) compound embedded in an Ag matrix requires the knowledge of critical current as a function of mechanical properties. Commercial tapes available in different types have been developed in industrial production scale in wh...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2006-06, Vol.16 (2), p.1027-1030
Main Authors: Shigue, C.Y., Baldan, C.A., Oliveira, U.R., Carvalho, F.J.H., Filho, E.R.
Format: Article
Language:English
Subjects:
Applied sciences
Bending strain
Bi-2223 tapes
Bismuth
Capacitive sensors
COMPOSITES
Conductors
CRACKS
Critical current
Critical current (superconductivity)
DEFORMATION
Degradation
Electrical engineering. Electrical power engineering
Electronics
Exact sciences and technology
fatigue
FATIGUE PROPERTIES
Filaments
High temperature superconductors
INDUSTRIAL APPLICATIONS
Materials
Mechanical factors
Production
REINFORCEMENT
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Silver
STRAIN
Strain measurement
Strontium
Studies
Superconducting devices
Superconducting tapes
SUPERCONDUCTORS
TAPE
Thermal degradation
thermal shock
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Summary:Application of high temperature superconductor Bi 2 Sr 2 Ca 2 Cu 3 O x (Bi-2223) compound embedded in an Ag matrix requires the knowledge of critical current as a function of mechanical properties. Commercial tapes available in different types have been developed in industrial production scale in which a combination of small diameter filaments, long tape lengths and a ductile matrix results in a conductor with low crack formation and good tolerance against strain. The measurement of critical current and the evaluation of n-index from V-I characteristic curves of Bi-2223/Ag composite tapes subjected to an initial bending strain as a function of number of thermal cycles were done for two types of Bi-2223/Ag composite tapes: with and without steel tape reinforcement. The results showed that tapes with reinforcement presented small critical current degradation as a function of the number of thermal cycles whereas tapes without reinforcement exhibited steadily critical current degradation caused by the propagation of cracks. The n-index followed the same critical current behavior
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2006.876585