Critical current degradation of Bi-2223 composite tapes induced by cyclic deformation and fatigue-related effects
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Data
2006-06-01
Autores
Shigue, Carlos Y.
Baldan, Carlos A.
Oliveira, Ulisses R.
Carvalho, Francisco J. H.
Ruppert Filho, E.
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Editor
Institute of Electrical and Electronics Engineers (IEEE)
Resumo
Application of high temperature superconductor Bi2Sr2Ca2Cu3Ox. (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.
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Palavras-chave
bending strain, Bi-2223 tapes, critical current, degradation, fatigue, thermal shock
Como citar
IEEE Transactions on Applied Superconductivity. Piscataway: IEEE-Inst Electrical Electronics Engineers Inc., v. 16, n. 2, p. 1027-1030, 2006.