A Shell Model for the Filament Structure of Bi-2223 Conductors

Holesinger, T. G.; Kennison, J. A.; Liao, Shasha; Yuan, Ye; Jiang, J.; Cai, X. Y.; Hellstrom, E. E.; Larbalestier, D. C.; Baurceanu, R M; Maroni, V.A.; Huang, Yibing

doi:10.1109/tasc.2005.847509

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…Figures 8(d) and 9 show that a dense colony of Bi-2212 grains had formed at the interface between the filament and the Ag matrix and that, on the other hand, a fibrous network of Bi-2212 grains had occupied the inside of the filament. This is consistent with the shell model developed by Holesinger et al to describe the microstructure of Bi-2223 multifilamentary tapes [39]. We postulate that the dense Bi-2212 that formed adjacent to Ag is the strong component, and that the one that developed away from the interface with Ag is the weak component.…”

Section: Microstructure and Its Relation To The Strain Effectsupporting

confidence: 91%

Reversible effect of strain on transport critical current in Bi₂Sr₂CaCu₂O_{8 +x}superconducting wires: a modified descriptive strain model

Cheggour¹,

Lu²,

Holesinger³

et al. 2011

Supercond. Sci. Technol.

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A reversible strain effect on transport critical current I c was found in Bi 2 Sr 2 CaCu 2 O 8+x (Bi-2212) high-temperature superconducting round wires. I c showed unambiguous reversibility at 4 K and 16 T up to an irreversible strain limit of about 0.3 % in longitudinal tension, prompting hope that the Bi-2212 conductor has the potential to sustain mechanical strains generated in high-field magnets. However, I c was not reversible under longitudinal compression and buckling of Bi-2212 grain colonies was identified as the main reason. A two-component model was proposed, which suggests the presence of mechanically weak and strong Bi-2212 components within the wire filaments. Porosity embedded in the weak component renders it structurally unsupported and, therefore, makes it prone to cracking under strain ε. I c (ε) is irreversible in tension if the weak component contributes to the transport critical current but becomes reversible once connectivity of the weak component is broken through strain increase or cycling. A modified descriptive strain model was also developed, which illustrates the effect of strain in the Bi-2212 conductor and supersedes the existing descriptive model. Unlike the latter, the new model suggests that higher pre-compressive strains should improve I c if buckling of Bi-2212 grains does not occur, and should result in a wider I c (ε) plateau in the applied tensile regime without degradation of the initial I c. The new model postulates that a reversible strain effect should exist even in the applied compressive strain regime if buckling of Bi-2212 grains could be prevented through elimination of porosity and mechanical reinforcement of the wire.

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Section: Microstructure and Its Relation To The Strain Effectsupporting

confidence: 91%

Reversible effect of strain on transport critical current in Bi₂Sr₂CaCu₂O_{8 +x}superconducting wires: a modified descriptive strain model

Cheggour¹,

Lu²,

Holesinger³

et al. 2011

Supercond. Sci. Technol.

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“…Interfacial regions of BSCCO-Ag have been found to sustain high current densities (Holesinger et al 2005). Silver-sheathed BSCCO wires exhibit poor mechanical properties because of the low yield strength of the metal.…”

Section: G Hts Tape/wire Types Fabrication Propertiesmentioning

confidence: 99%

High temperature superconductor (HTS) wires and tapes

Selvamanickam

2012

High Temperature Superconductors (HTS) for Energy Applications

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“…For drawing process it is important to achieve homogeneity and high density of (BiSrCaCuO) BSCCO powder in filaments. It is preferable to form well-developed alignment of the superconducting powder after several rolling passes [2] . Usually the multi-filament Bi-2223/Ag wire is drawn to a final diameter of 1.7 mm by a series of arc dies, then the circular wire is rolled to a thin tape, thereby the contact area between the forming wire and the rollers increases dramatically during rolling which leads to the inhomogeneous distribution of the plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Investigation on drawing process of Bi-2223/Ag wires using racetrack-type dies: Simulation and experiments

Zhang

Lei

et al. 2009

Sci. China Ser. E-Technol. Sci.

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The traditional rolling process of Bi-2223/Ag wires with circular sections is an inhomogeneous process. For the purpose of achieving a uniform filaments distribution, a novel technique for round wire through racetrack-type dies during the last several passes of drawing is necessarily brought forward. In order to investigate the processing behaviors of superconducting filaments, a numerical model for the three passes of racetrack drawing was constructed, and subsequently, the optimization of three racetrack-type dies was designed based on the simulation results. Then the three passes of racetrack drawing was applied to fabricate Bi-2223/Ag tape and the density distribution of each filament of the wire was studied by Vickers microhardness. The experimental results showed that the racetrack drawing can obtain dense superconducting filaments, and improve the mechanical properties and critical current of the final tape.racetrack-type die, Bi-2223/Ag, modelling

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A Shell Model for the Filament Structure of Bi-2223 Conductors

Cited by 8 publications

References 17 publications

Reversible effect of strain on transport critical current in Bi₂Sr₂CaCu₂O_{8 +x}superconducting wires: a modified descriptive strain model

Reversible effect of strain on transport critical current in Bi₂Sr₂CaCu₂O_{8 +x}superconducting wires: a modified descriptive strain model

High temperature superconductor (HTS) wires and tapes

Investigation on drawing process of Bi-2223/Ag wires using racetrack-type dies: Simulation and experiments

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A Shell Model for the Filament Structure of Bi-2223 Conductors

Cited by 8 publications

References 17 publications

Reversible effect of strain on transport critical current in Bi2Sr2CaCu2O8 +xsuperconducting wires: a modified descriptive strain model

Reversible effect of strain on transport critical current in Bi2Sr2CaCu2O8 +xsuperconducting wires: a modified descriptive strain model

High temperature superconductor (HTS) wires and tapes

Investigation on drawing process of Bi-2223/Ag wires using racetrack-type dies: Simulation and experiments

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Reversible effect of strain on transport critical current in Bi₂Sr₂CaCu₂O_{8 +x}superconducting wires: a modified descriptive strain model

Reversible effect of strain on transport critical current in Bi₂Sr₂CaCu₂O_{8 +x}superconducting wires: a modified descriptive strain model