Fabrication of Ag/(Bi,Pb)SrCaCuO superconducting tapes

Huang, Yibing; Fuente, G.F. de la; Ruiz, María Luisa Bernal; Larrea, Á.; Badı́a, A.; Lera, F.; Rillo, C.; Navarro, Rafael

doi:10.1016/0011-2275(93)90088-6

Cited by 15 publications

(2 citation statements)

References 11 publications

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“…This experiment clearly illustrates the diminishing returns of continuing to deform and heat treat 2223 tapes after the conversion to 2223 is essentially complete, and no liquid phase is available [9,31]. Although cracks in pressed samples which do not heal during heat treatment are less detrimental to the transport J c than cracks formed in rolled tapes (because of their more favourable alignment and the improved density and properties of the remaining wellconnected percolative path), eventually the cracking can become so severe that the transport J c will decrease even for pressed tapes [1,10,11,15,21,43,44]. We conclude that it is thus very important to optimize heat treatment and deformation parameters [9,13] in order to avoid the formation of large cracks which cannot be healed during heat treatment because the conversion to 2223 has already been largely completed.…”

Section: Discussionmentioning

confidence: 99%

Direct evidence for residual, preferentially-oriented cracks in rolled and pressed Ag-clad BSCCO-2223 tapes and their effect on the critical current density

Parrell

Polyanskii

Pashitski

et al. 1996

Supercond. Sci. Technol.

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We have studied the connectivity of rolled and pressed Ag-sheathed (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O x tapes through three deformation and heat treatment cycles using magneto-optical imaging. In pressed samples, a transport critical current density of ∼ 11 kA cm −2 (77 K, 0 T) was reached after two heat treatment steps, and increased to ∼ 21 kA cm −2 after a third heat treatment. Critical current density values in rolled samples also reached ∼ 11 kA cm −2 after two heat treatments, but decreased to ∼ 4 kA cm −2 after the subsequent deformation and third heat treatment. Magneto-optical imaging using fields applied perpendicular to the rolling plane revealed that flux penetrated the superconducting core mainly through defects oriented perpendicular to the direction of current flow in rolled samples, and parallel to the direction of current flow in pressed samples. In those samples which had received more than one heat treatment, the flux is believed to penetrate through cracks produced during the deformation steps which do not heal during the subsequent heat treatments due to lack of sufficient residual liquid phase.

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Section: Discussionmentioning

confidence: 99%

Direct evidence for residual, preferentially-oriented cracks in rolled and pressed Ag-clad BSCCO-2223 tapes and their effect on the critical current density

Parrell

Polyanskii

Pashitski

et al. 1996

Supercond. Sci. Technol.

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“…Great efforts have been made to improve the critical current density of Ag-Bi(2223) tape at high temperature, such as use of a reactive precursor powder prepared by a chemical process [2,3], optimizing the deformation and heat treatment schedule [4] and controlling the microstructure development [5]. The starting powder has been shown to greatly affect J c [6]. The fabrication of long Ag-Bi(2223) tape needs the manufacture of BiPbSrCaCuO powder with high homogeneity, ultrafine particles and low carbon content in large quantities [7].…”

Section: Introductionmentioning

confidence: 99%

The combination of the polymeric solution - sol - gel process and combustion synthesis to manufacture BiPbSrCaCuO powder

Mao

Zhou

et al. 1996

Supercond. Sci. Technol.

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The polymeric solution-sol-gel (SSG) process has been greatly improved by combination of the high homogeneity of SSG and the high efficiency of combustion synthesis to manufacture BiPbSrCaCuO powder with high homogeneity, ultrafine particles and low carbon content for fabrication of high-J c silver-sheathed bismuth-based 2223 superconducting tape. The improved SSG, termed solution-sol-gel-SHS (SSGS), is realized by ignition of homogeneous wet gel derived from polymeric SSG. X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infared spectroscopy (FTIR) are used to optimize the SSG process and investigate the mechanism of the SSG transition.

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Effect of Heat Treatment on Transport Critical Current Densities in Ag-Clad Bi-Based Superconducting Tapes

Chikaba

1994

Advances in Cryogenic Engineering Materials

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Fabrication of Ag/(Bi,Pb)SrCaCuO superconducting tapes

Cited by 15 publications

References 11 publications

Direct evidence for residual, preferentially-oriented cracks in rolled and pressed Ag-clad BSCCO-2223 tapes and their effect on the critical current density

Direct evidence for residual, preferentially-oriented cracks in rolled and pressed Ag-clad BSCCO-2223 tapes and their effect on the critical current density

The combination of the polymeric solution - sol - gel process and combustion synthesis to manufacture BiPbSrCaCuO powder

Effect of Heat Treatment on Transport Critical Current Densities in Ag-Clad Bi-Based Superconducting Tapes

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