Artículos de revistas
Critical current degradation of Bi-2223 composite tapes induced by cyclic deformation and fatigue-related effects
Fecha
2006-06-01Registro en:
IEEE Transactions on Applied Superconductivity. Piscataway: IEEE-Inst Electrical Electronics Engineers Inc., v. 16, n. 2, p. 1027-1030, 2006.
1051-8223
10.1109/TASC.2006.876585
WOS:000244804100231
Autor
Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
Universidade Estadual de Campinas (UNICAMP)
Institución
Resumen
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.