Improvements in Critical Current Density for Bi1.8Pb0.4Sr2Ca2Cu3Ox (2223) OPIT Tapes by Increasing Ag-Superconductor Contact

Prorok, Barton C.; Eror, N. G.; Balachandran, U.; Lelovic, M.; Deis, T.; Krishnaraj, P.; Iyer, N.C.

doi:10.1007/978-1-4757-9059-7_99

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…Very thin layers (2-3 µm) of superconductor were observed in a processed tape. These thin layers were able to support an I c of about 20 A which translated into a J c value greater than 10 5 A cm −2 at 77 K. Tapes with the same superconductor total cross sectional area but different lengths of interface with the Ag sheath were produced [6]. The I c was shown to be directly proportional to the length of the superconductor-Ag interface and was expressed as a linear function of the interface perimeter length (IPL).…”

Section: Introductionmentioning

confidence: 99%

The effect of cooling rates on transport current properties and the critical temperature of Ag-sheathed BSCCO-2223 superconducting tapes

Lelovic

Deis

Eror

et al. 1996

Supercond. Sci. Technol.

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The transport current properties of Ag-sheathed (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O y BSCCO-2223 superconducting tapes were analysed as a function of cooling rate. Changing the cooling rate showed a pronounced effect on the transport current of the superconductor heat-treated at 810 • C in a 7% O 2 atmosphere. Results indicated that, during fast cooling, the thin layer of BSCCO adjacent to the Ag sheath is under compression. The compressive stress causes microcracking and affects the alignment and interconnectivity of 2223 grains in the thin layer of BSCCO next to the silver sheath. This changes the current path through the high-critical-current-density region in the superconductor. A comparison between furnace-cooled tapes and slowly cooled tapes (10 • C h −1 to 780 • C and then 1 • C min −1 to room temperature) showed that the latter attained two or three times higher I c values. Based on this observation, a cooling schedule that includes several intermediate cooling steps is suggested. The effect of the lattice parameter on T c was investigated. Behaviour analogous to that of the 2212 phase was found, T c was affected by changes in the c-axis of the 2223 phase. However, the effect was not as pronounced as it was in the 2212 phase.

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Section: Introductionmentioning

confidence: 99%

The effect of cooling rates on transport current properties and the critical temperature of Ag-sheathed BSCCO-2223 superconducting tapes

Lelovic

Deis

Eror

et al. 1996

Supercond. Sci. Technol.

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“…Several investigations [4][5][6] state that the BSCCO near the silver interface has a very good texture, high density and phase purity and high-critical current density. Thus, the geometry of the filaments is important, and wide, thin filaments with a large interface perimeter length are desirable [7].…”

Section: Alternative Wire Reduction Processesmentioning

confidence: 99%

Mechanical processing of Ag/BSCCO high temperature superconductor tape

Bay

Nielsen

2004

Journal of Materials Processing Technology

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“…In fact studies on various strands (see, e.g. [16,17]) have indicated that close proximity to Ag favours the attainment of the highest J c s. Metals other than Ag degrade the properties of Bi:HTSC by disturbing its Cu-O sublattice either by metal/metal substitution or chemical reduction that can take place readily via the Ag sheath. Although the Ag layer may inhibit metallic diffusion it is no barrier to oxygen and in fact can even facilitate the reduction of Bi:HTSC by an externally positioned metal layer.…”

Section: Poisoning Studies and Core Alloy Selectionmentioning

confidence: 99%

Bi:2212/Ag-based Rutherford cables: production, processing and properties

Collings

Sumption

Scanlan

et al. 1999

Supercond. Sci. Technol.

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The fabrication of Bi:2212/Ag-based Rutherford-type accelerator cables, their transport critical current testing and ac loss measurement are described. Multifilamentary strands were used to form several cables with 18-19 strands and a lay pitch, (half the transposition pitch) of 27.5 mm. The inclusion of a metallic alloy core was proposed for mechanical strength, the limiting of cable winding damage and ac loss/residual magnetization mitigation. Single-strand measurements of `poisoning' from several candidate core materials are reported, as well as the influences of winding pitch and thermal shock degradation on . Nichrome 80 was selected as a core material on the basis of ready availability in strip form and its initially observed inertness from a poisoning standpoint. In-cable single-strand studies indicated that winding damage could degrade edge-measured by about 16%. Full cable measurements demonstrated that core-induced poisoning could reduce by a further 35-40%. Ac loss measurements on a series of specially designed cables showed that the core (either bare or coated) effectively insulated the strands against crossover contact. This, together with the fact that the cable had been only lightly compacted (thereby ensuring moderate but not strong side-by-side contact) allowed the effective interstrand contact resistance of a projected Bi:2212/Ag-wound core-type LHC Rutherford cable to fall close to the acceptability range for the windings of accelerator magnets.

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Improvements in Critical Current Density for Bi1.8Pb0.4Sr2Ca2Cu3Ox (2223) OPIT Tapes by Increasing Ag-Superconductor Contact

Cited by 6 publications

References 7 publications

The effect of cooling rates on transport current properties and the critical temperature of Ag-sheathed BSCCO-2223 superconducting tapes

The effect of cooling rates on transport current properties and the critical temperature of Ag-sheathed BSCCO-2223 superconducting tapes

Mechanical processing of Ag/BSCCO high temperature superconductor tape

Bi:2212/Ag-based Rutherford cables: production, processing and properties

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