Superconductive joint on Bi2223/Ag multifilamentary tape

Wang, Y.; Luan, W; Lin, W.; Hua, Peiwen; Li, Y.N.; Feng, Rui; Zhou, Qi; Yao, Youqiang; Yuan, Guansen

doi:10.1016/s0921-4534(02)02249-9

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…Kim et al [80] used the monofilament tape as the intermediate material. Wang et al [81] sandwiched the Bi-2223 precursor powder between the exposed filaments of two tapes. A new polycrystalline Bi-2223 layer was synthesized between the tapes by heat treatment, thereby achieving the superconducting joint.…”

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

confidence: 99%

“…In 2009-2010, Guo et al [82,83] demonstrated superconducting joints between commercially available 4.3 mm wide and 0.22 mm thick tapes Bi-2223/Ag tapes with 61 filaments developed by Beijing Innova Superconductor Technology Co., Ltd The Ag sheath of the tapes was chemically etched using NH 3 /H 2 O 2 (aq). The exposed filaments were directly faced or indirectly overlapped by sandwiching Bi-2223 precursor powder as specified in [81]. To connect the filaments, heat treatment was performed at 800 • C for 2 h with uniaxial pressure of 3 MPa.…”

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

confidence: 99%

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

confidence: 99%

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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“…Literatures have reported [11] that the joint with precursor powder interlayer was fabricated by Tkaczyk' method (cold pressure under about 1000 MPa and post-annealing treatment at about 835°C for about 50 h). Note that the precursor powder was mainly composed of Bi-2212 phase (Bi 2 Sr 2 Ca 1 Cu 2 O d ) and a small amount of Ca 2 PbO 4 , CuO, Bi-2201, etc.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of joint Bi-2223/Ag superconducting tapes with BSCCO superconducting powders by diffusion bonding

Guo¹,

Zou²,

Wu³

et al. 2010

Physica C: Superconductivity

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“…As for BSCCO superconductors, great effort has been made on the bonding technologies, such as melting welding, semi-solid bonding, resistive soldering, microwave bonding and the conventional diffusion bonding with or without interlayers which includes first high pressure cold-weld at room temperature and then annealing for 50∼200 hours at high temperature. [4][5][6][7][8][9] Compared with the above bonding technologies, the direct diffusion bonding with an uniaxial pressure to the bonding region during bonding thermal-cycle would be a promising * Author to whom correspondence should be addressed. one for fabricating high quality superconducting joints, leading to a high joining efficiency because of a shorted bonding period.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Bonding with a Powder Interlayer Between Bi-Sr-Ca-Cu-O Superconducting Tapes

Wang¹,

Gui-sheng²,

Bai³

et al. 2008

Jnl of Comp & Theo Nano

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A diffusion bonding technology with an uniaxial pressure to the bonding region during the thermalcycle using a superconducting powder interlayer has been applied to join Bi-Sr-Ca-Cu-O 61 multifilamentary superconducting tapes. The precursor powders used for the preparation of Bi-Sr-Ca-Cu-O tapes were adopted as interlayers, which were mainly composed of Bi-2212 phases. The effects of holding time and uniaxial pressure on the superconductivity and microstructures of the joints were investigated preliminarily. The results indicate that appropriate holding time and uniaxial pressure during the diffusion bonding had beneficial effects both on the formation of metallurgical interface between the powder interlayer and superconducting cores and on the superconductivity of the joints. The Bi-2212 phases of the powder bonding interlayer partially decomposed into (Sr,Ca) 2 CuO 3 , CuO and other non-superconducting phases at bonding temperature during the several hours of holding time. The average superconducting critical current of the joints reached up to 38% of that of the original tapes.

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Superconductive joint on Bi2223/Ag multifilamentary tape

Cited by 6 publications

References 4 publications

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

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

Fabrication of joint Bi-2223/Ag superconducting tapes with BSCCO superconducting powders by diffusion bonding

Diffusion Bonding with a Powder Interlayer Between Bi-Sr-Ca-Cu-O Superconducting Tapes

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