Predictive model for critical current density of Ag-sheathed Bi2Sr2Ca1Cu2O8 composite tapes with fabrication defects

Patel, S.; Haugan, Timothy J.; Chen, S.; Wong, F.; Narumi, E.; Shaw, D.T.

doi:10.1016/0011-2275(94)90215-1

Cited by 15 publications

(2 citation statements)

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“…Inherent to OPIT-derived tapes where Bi(Pb)SCCO ceramics are enclosed in Ag sheaths is the problem of tape blistering (bubbling). This process is caused by gas release from the ceramic core during thermal processing and results in degradation of J c [2]. Only few papers have been reported where this problem has been considered [2,3,4] or mentioned [5].…”

Section: Introductionmentioning

confidence: 99%

“…This process is caused by gas release from the ceramic core during thermal processing and results in degradation of J c [2]. Only few papers have been reported where this problem has been considered [2,3,4] or mentioned [5]. Melt processing followed by phase decomposition and oxygen evolution was claimed as the main cause of blistering in Ag/Bi-2212 tapes.…”

Section: Introductionmentioning

confidence: 99%

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The blistering phenomenon in BiSCCO-2223 high- superconducting tapes

Beilin

Goldgirsh

Schieber

et al. 1996

Supercond. Sci. Technol.

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The blistering phenomenon in OPIT-derived Bi(Pb)SCCO/Ag (Bi-2223/Ag) composite tapes has been studied for a wide range of tape processing parameters. A Pb-free and Bi-deficient phase was observed after prolonged sintering (for 50-100 h at 830-840 • C) at the internal surface of an cylindrical cavity formed inside a ceramic core during heating. It depressed the 2212-to-2223 transformation in the blistered sample and led to an extremely low value of J c of 500 A cm −2 at 77 K. At a given sample length a critical heating rate existed below which cylinders did not grow. This rate decreased with sample length increase. Preliminary rolling of a blistered tape just after cylinder formation as well as the annealing of as-rolled tape at 500-700 • C prevented blistering during the subsequent thermomechanical processing. These measures resulted in the value of J c exceeding 1 × 10 4 A cm −2 at 77 K.

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