Critical current density enhancement in Ag-sheathed Bi-2223 superconducting tapes

Li, Q.; Brodersen, Klaus; Hjuler, Hans Aage; Freltoft, T.

doi:10.1016/0921-4534(93)90340-v

Cited by 257 publications

(94 citation statements)

References 12 publications

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“…This method involves mixing a powder composed mostly of the 2212 phase with a second powder composed of specific non-superconducting phases. Further, there is evidence which indicates that beginning with partially reacted powders (mostly 2212 and non-superconducting phases) can lead to higher values of J, than beginning with fully-reacted powders (mostly 2223) [2]- [4]. Also, by having a controlled phase assemblage of nonsuperconducting phases in a starting powder, reproducibility may be more easily achieved in terms of both microstructure and 3,.…”

Section: Introductionmentioning

confidence: 99%

Phase formation in Ag-sheathed (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ tapes using a one- and two-powder process with and without Ag additions

Parrella

Sung

Hellstrom

1995

IEEE Trans. Appl. Supercond.

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Absfract-The formation of (Bi,Pb)2Sr2Ca2Cu3010 ((Bi,Pb)2223) in Agsheathed tapes was compared for two different powder processing techniques. In one technique, a phase assemblage of (Bi,Pb)2Sr2CaCu20g ((Bi,Pb)2212), (Ca,Sr)2CuOj , and CuO was produced in a single powder processed by Aerosol Spray Pyrolysis (ASP). This is called a 1-powder procesr. In the other technique, the same phase assemblage was produced by mixing a precursor powder composed of (Bi,Pb)2212 with a second precursor powder composed of Ca2CuO3 and CuO. (Both of the precursor powders were also processed by ASP.) This is called a 2-powder process. A set of tapes were made by the 1-powder process that contained 1, 5, and 10 wt.% Ag. The tape with 1 wt.% Ag yielded a microstructure of nearly phase pure (Bi,Pb)2223.

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Section: Introductionmentioning

confidence: 99%

Phase formation in Ag-sheathed (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ tapes using a one- and two-powder process with and without Ag additions

Parrella

Sung

Hellstrom

1995

IEEE Trans. Appl. Supercond.

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“…The liquid phase promotes Bi2223 phase formation and increases grain alignment and connectivity. The formation of the liquid phase during the heat treatment depends on the sintering temperature, the composition, the phase assemblage and the particle size distribution of the precursor powder [14,23]. At lower temperatures (838…”

Section: J Ct and Phase Transformation Dynamicsmentioning

confidence: 99%

“…• C/24 h calcination leads to a powder composed principally of Bi2212, Ca 2 PbO 4 , CuO, Sr 14 and CuSrO 2 . The three precursor powders (P63, P100 and P200) exhibit similar XRD patterns, with the Bi2212 phase being predominant, as illustrated in figure 1 for the powder P63.…”

Section: Csf Process and Precursor Particle Sizesmentioning

confidence: 99%

“…Furthermore, one of the keys to prepare samples which exhibit high critical current densities (J c ) is to control the grain size. Many groups reported that with the PIT process, a small grain size is favourable to obtain a high J c [11][12][13][14]. A fine precursor powder increases the reactivity, which under appropriate conditions promotes the Bi2223 phase formation and increases the intergrain connectivity.…”

Section: Introductionmentioning

confidence: 99%

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Sinter-forging of strongly textured Bi2223 discs with largeJ_cs: nucleation and growth of Bi2223 from Bi2212 crystallites

Guilmeau

Chateigner

Noudem

2002

Supercond. Sci. Technol.

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Dense Bi2223 superconductor discs with a highly oriented structure were prepared by the sinter-forging method. A detailed investigation of the processing parameters has been carried out on the phase assemblage, the particle size of the calcined precursor powder and the sinter-forging time and temperature. A high transport critical current density, J c , was obtained from a starting powder rich in Bi2212 and secondary phases. Using fine powder, a high degree of orientation, larger than those of multifilamentary tapes, and excellent intergrain connection were observed. The optimal sinter-forging temperature was found to be in the range of 845-850• C and the transport critical current densities reached values of 12 700 A cm −2 at 77 K in self-field. The combination of textural and microstructural investigations testify that a nucleation-growth mechanism from the Bi2212 particles is responsible for the Bi2223 phase formation, rather than an intercalation process.

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“…In short samples, J c of 6.9×10 4 A cm −2 [3] and 7.3×10 4 A cm −2 [4] has been achieved in zero-field at 77 K. High-field applications rely on the use of high-performance tapes of kilometre lengths. In the Bi-2223 system, this level of performance is now being realized with J c of 1.2 × 10 4 A cm −2 reported over 1260 m [5], 1.8 × 10 4 A cm −2 over 250 m [6] and over 2 × 10 4 A cm −2 achieved in 1200 m [7], 1000 m [8] and 400 m [9] lengths at 77 K in self-fields.…”

Section: Introductionmentioning

confidence: 99%

Design, fabrication and performance of a 1.29 T Bi-2223 magnet

Sneary

Friend²,

Hampshire

2001

Supercond. Sci. Technol.

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The design and fabrication procedure of a laboratory-scale Bi-2223 tape superconducting magnet with a bore of 40 mm and a maximum field of 1.29 T at 4.2 K is presented. The magnet comprises six resin impregnated double-wound pancakes of bore diameter 40 mm fabricated via the react-and-wind route. Critical current density (J c ) measurements have been made as a function of magnetic field, angle and strain at 4.2 K and 77 K on short samples. In zero field, the critical current density for the superconducting cross-sectional area of the tape was 8.3 × 10 4 A cm −2 (4.2 K) and 1.18 × 10 4 A cm −2 (77 K). The electric field-current density characteristics of all the components of the coils when individually energized or with the whole magnet energized have been measured. Comparison between short sample measurements and performance of the magnet show that minimal additional damage occurred beyond the ∼20% that was produced by the bending strain during the wind-and-react fabrication procedure and the ∼10% variation of the long length J c of the tape. Sufficient detail is provided for the non-specialist to assess both the use of potential brittle superconducting tapes for magnet technology and to construct a laboratory-scale magnet.

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Critical current density enhancement in Ag-sheathed Bi-2223 superconducting tapes

Cited by 257 publications

References 12 publications

Phase formation in Ag-sheathed (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ tapes using a one- and two-powder process with and without Ag additions

Phase formation in Ag-sheathed (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ tapes using a one- and two-powder process with and without Ag additions

Sinter-forging of strongly textured Bi2223 discs with largeJ_cs: nucleation and growth of Bi2223 from Bi2212 crystallites

Design, fabrication and performance of a 1.29 T Bi-2223 magnet

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Critical current density enhancement in Ag-sheathed Bi-2223 superconducting tapes

Cited by 257 publications

References 12 publications

Phase formation in Ag-sheathed (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ tapes using a one- and two-powder process with and without Ag additions

Phase formation in Ag-sheathed (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ tapes using a one- and two-powder process with and without Ag additions

Sinter-forging of strongly textured Bi2223 discs with largeJcs: nucleation and growth of Bi2223 from Bi2212 crystallites

Design, fabrication and performance of a 1.29 T Bi-2223 magnet

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Sinter-forging of strongly textured Bi2223 discs with largeJ_cs: nucleation and growth of Bi2223 from Bi2212 crystallites