Experimental Investigation of Bi-2223/Ag Superconducting Tape Joints

Ebara, Yuta; Tsurudome, Takehisa; Morie, Takaaki; Nishine, Kazuhiko; Oguro, Hidetoshi; Awaji, Satoshi

doi:10.1109/tasc.2018.2801358

Cited by 7 publications

(3 citation statements)

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“…26,27) Although joint samples fabricated by adopting this process for DI-BSCCO tapes 28) showed quite low resistance of ∼10 −12 Ω by forming the superconducting joint, I c across the joint was low, ∼10 A at 4 K in self-field. 29) Such a low joint I c value might be due to the poor J c properties of the Bi2223 polycrystalline bulk at the joint layer, which is typically lower than 1 kA cm −2 at 77 K in the self-field. 30) Our recent studies have clarified the strategies for preparing the Bi2223 polycrystalline materials with high J c characteristics.…”

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confidence: 99%

High I _c superconducting joint between Bi2223 tapes

Takeda¹,

Motoki²,

Kitaguchi³

et al. 2019

Appl. Phys. Express

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For realizing high-Tc cuprate superconductors (HTS) magnets equipped with a persistent current circuit, superconducting joints between HTS tapes are indispensable. In the present study, development of superconducting joints with high Ic and high Tc between the Ag-sheathed multi-filamentary Bi2223 commercial tapes were attempted using Bi2223 polycrystalline intermediate joint layers. High joint Ic above 400 A at 4.2 K in the self-field was successfully achieved by the formation of the grain connection between the joint layer and filaments of the tape and by an increase in the number of the joined filaments.

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confidence: 99%

High I _c superconducting joint between Bi2223 tapes

Takeda¹,

Motoki²,

Kitaguchi³

et al. 2019

Appl. Phys. Express

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“…This indirect method was applied to DI-BSCCO ® , the practical Bi-2223/Ag tape. Ebara et al [84,85] fabricated a loop sample having one Bi-2223 superconducting joint, with the surface filaments of both ends were exposed by etching the Ag sheath with a knife. After sandwiching precursor powder between the exposed filaments to form a closed-loop shape, heat treatment was performed at 838 • C for 100 h under uniaxial pressure.…”

Section: History Of the Development Of Superconducting Joint Between ...mentioning

confidence: 99%

Review of the temporal stability of the magnetic field for ultra-high field superconducting magnets with a particular focus on superconducting joints between HTS conductors

Takeda¹,

Maeda²,

Ohki³

et al. 2022

Supercond. Sci. Technol.

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Superconducting magnets used in applications such as magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) require significant temporal magnetic field stability, which can be achieved when the MRI and NMR magnets are operated in the persistent current mode (persistent-mode) using superconducting joints. However, the ultra-high field MRI and NMR magnets are sometimes operated in the driven mode. Herein, we present an analysis of the temporal magnetic field drift and fluctuations observed for MRI and NMR magnets operating in the driven mode and an exploration of effective methods for stabilizing the temporal magnetic field fluctuations. In the last decade, substantial improvements have been achieved in superconducting joints between high-temperature superconductors (HTS). These superconducting joints enable the development of persistent-mode ultra-high field magnets using HTS coils. Therefore, we herein review the superconducting joint technology for HTS conductors and describe the results of the persistent-mode operation achieved by a medium-field NMR magnet using an HTS coil. Particularly, the cutting-edge progress achieved concerning HTS superconducting joints, including joining methods, superconducting properties, and future prospects, is highlighted along with the issues that need to be addressed.

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“…Compared to the development of joints between RE123coated conductors, those between Bi2223 tapes are less advanced. A typical option to form a superconducting joint between Bi2223 tapes is using solid diffusion at the joint boundary in conjunction with the application of compressive pressure [16][17][18][19]. A major problem of this method is a mechanically weak joint interface developed by solid diffusion.…”

Section: Introductionmentioning

confidence: 99%

Superconducting joint between multi-filamentary Bi₂Sr₂Ca₂Cu₃O_10+δ tapes based on incongruent melting for NMR and MRI applications

Jin¹,

Suetomi²,

Piao³

et al. 2019

Supercond. Sci. Technol.

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Recently, we proposed a method of forming superconducting joints between high-temperature superconducting wires based on the incongruent melting of an intermedium, called crystalline joint by melted bulk. Using this technique with GdBa2Cu3O7−δ-coated conductors, a superconducting joint with a critical current of 7 A at 77 K was obtained. In the present study, a joint between multi-filamentary Bi2Sr2Ca2Cu3O10+δ (Bi2223) tapes was prepared without an intermedium, employing incongruent melting of Bi2223 filaments in the tapes. A superconducting joint was successfully fabricated, with critical currents of 12.2 A and 177 A at 77 K and 4.2 K, respectively. A Bi2223 coil terminated with the present joint method was operated in persistent current mode and showed an ultra-low field decay rate with a characteristic resistance of 10−12 Ω at 77 and 4.2 K.

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Experimental Investigation of Bi-2223/Ag Superconducting Tape Joints

Cited by 7 publications

References 0 publications

High I _c superconducting joint between Bi2223 tapes

High I _c superconducting joint between Bi2223 tapes

Review of the temporal stability of the magnetic field for ultra-high field superconducting magnets with a particular focus on superconducting joints between HTS conductors

Superconducting joint between multi-filamentary Bi₂Sr₂Ca₂Cu₃O_10+δ tapes based on incongruent melting for NMR and MRI applications

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Experimental Investigation of Bi-2223/Ag Superconducting Tape Joints

Cited by 7 publications

References 0 publications

High I c superconducting joint between Bi2223 tapes

High I c superconducting joint between Bi2223 tapes

Review of the temporal stability of the magnetic field for ultra-high field superconducting magnets with a particular focus on superconducting joints between HTS conductors

Superconducting joint between multi-filamentary Bi2Sr2Ca2Cu3O10+δ tapes based on incongruent melting for NMR and MRI applications

Contact Info

Product

Resources

About

High I _c superconducting joint between Bi2223 tapes

High I _c superconducting joint between Bi2223 tapes

Superconducting joint between multi-filamentary Bi₂Sr₂Ca₂Cu₃O_10+δ tapes based on incongruent melting for NMR and MRI applications