Improvement of critical current density in the Bi-Pb-Sr-Ca-Cu-O system through hot isostatic pressing

Dou, Shi Xue; Liu, H.K.; Apperley, M.; Song, Kang-Ho; Sorrell, Charles Christopher; Easterling, K. E.; Niska, John; Guo, S.J.

doi:10.1016/0921-4534(90)90670-a

Cited by 45 publications

(10 citation statements)

References 2 publications

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“…Thus, OP-PMP reduces porosity on multiple length scales. As observed in prior studies, high pressure heat treatment improves diffusion across grain boundaries due to the stress gradients between the grain boundaries and pores [25,28,37,38]. This leads to a better connectivity between Bi2212 grains and reduces the formation of porous grain boundaries in Bi2212 filaments of the OP-PMP wire.…”

Section: Op Densifies Bi2212 Filaments On Multiple Length Scalessupporting

confidence: 53%

Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi₂Sr₂CaCu₂O_x/Ag multifilamentary round wire

Naderi

Schwartz

2014

Supercond. Sci. Technol.

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Recently, significantly improved transport properties in Bi 2 Sr 2 CaCu 2 O x /Ag (Bi2212/Ag) multifilamentary round wire (RW) has been achieved by applying 100 atm over-pressure (OP) during partial melt processing (PMP). Despite this significant progress, the microstructural details and phase evolution during the high pressure partial melt processing are poorly understood, and previous studies have focused solely on densification. Here we investigate the processing-microstructure-transport relationships of OP-PMP RWs by comparing the filament microstructure of a PMP wire with that of an OP-PMP wire on multiple length scales. OP affects the microstructure differently in each stage of PMP: it causes grain growth during pre-annealing, increases the peritectic melting temperature in the partial melt, improves oxygen uptake during solidification, and enhances grain connectivity during sintering. It is also found that the increase in transport of OP-PMP wire is related to increase in Bi2212 filament density on multiple length scales. Yet OP-PMP wire shows higher area fraction of filaments with large Bi2201 grains. Thus, to further improve transport, optimization of OP-PMP is essential; in particular the maximum heat treatment temperature should be increased, consistent with the increase in peritectic melt temperature, such that less Bi2201 grains form during processing.

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Section: Op Densifies Bi2212 Filaments On Multiple Length Scalessupporting

confidence: 53%

Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi₂Sr₂CaCu₂O_x/Ag multifilamentary round wire

Naderi

Schwartz

2014

Supercond. Sci. Technol.

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“…After the discovery of Bi-2223, the effects of density on critical current density (J c ) were first investigated using bulk sintered samples. 16,17) Because sintered pellets are normally porous, densification was considered to bring about high J c values simply owing to the enhancement of the current flow path. However, these HIP studies were not particularly successful in densifying Bi-2223 and retaining its superconducting properties.…”

Section: Controlled Overpressure Sintering Processmentioning

confidence: 99%

Present Status and Future Perspective of Bismuth-Based High-Temperature Superconducting Wires Realizing Application Systems

Sato

Kobayashi

Nakashima

2011

Jpn. J. Appl. Phys.

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Among a series of high-temperature superconducting materials that have been discovered to date, (Bi,Pb)2Sr2Ca2Cu3O10-x is the best candidate for superconducting wires that are long with commercial productivity, and critical current performance. In particular, the controlled overpressure (CT-OP) sintering technique gave us a 100% density of (Bi,Pb)2Sr2Ca2Cu3O10-x portion, which leads to robustness, increase in critical current, and mechanical tolerance. Many application prototypes are already verified and are being evaluated worldwide. Current leads for large magnets and magnetic billet heaters are already commercial products. Commercial applications for power cables, motors for ship propulsion and electric vehicles, and many kinds of magnets are promising in the near future.

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“…The density of the sintered product is one of the main factors that determine the critical current density and the magnetic shielding factor. Unlike other ceramics, (Bi,Pb)-2223 undergoes a dretrogradeT densification during sintering [6][7][8][9]. This is due to the layered morphology of the Bi-based compounds arising due to the weak bonding between the adjacent Bi-O layers [9].…”

Section: Introductionmentioning

confidence: 96%

Effect of precursor phase assemblage on densification and critical current density of (Bi,Pb)-2223 superconductor

et al. 2004

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Improvement of critical current density in the Bi-Pb-Sr-Ca-Cu-O system through hot isostatic pressing

Cited by 45 publications

References 2 publications

Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi₂Sr₂CaCu₂O_x/Ag multifilamentary round wire

Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi₂Sr₂CaCu₂O_x/Ag multifilamentary round wire

Present Status and Future Perspective of Bismuth-Based High-Temperature Superconducting Wires Realizing Application Systems

Effect of precursor phase assemblage on densification and critical current density of (Bi,Pb)-2223 superconductor

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Improvement of critical current density in the Bi-Pb-Sr-Ca-Cu-O system through hot isostatic pressing

Cited by 45 publications

References 2 publications

Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi2Sr2CaCu2Ox/Ag multifilamentary round wire

Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi2Sr2CaCu2Ox/Ag multifilamentary round wire

Present Status and Future Perspective of Bismuth-Based High-Temperature Superconducting Wires Realizing Application Systems

Effect of precursor phase assemblage on densification and critical current density of (Bi,Pb)-2223 superconductor

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Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi₂Sr₂CaCu₂O_x/Ag multifilamentary round wire

Multiscale studies of processing-microstructure-transport relationships in over- pressure processed Bi₂Sr₂CaCu₂O_x/Ag multifilamentary round wire