4.7 Review

Recent progress in MgB2 superconducting joint technology

Related references

Note: Only part of the references are listed.
Article Physics, Applied

Demonstration of better superconducting performance in a solder with low lead content

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Summary: Researchers have found that adding materials such as Pb, Nb, AgCu and graphene nano pellets into SnIn (35:65) can enhance its superconducting properties. Even low Pb additions show a dramatic improvement in superconducting properties and could potentially replace commonly used PbBi solder with better results.

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MgB2 Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

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Summary: A superconducting joint architecture is proposed to screen external magnetic fields in MRI magnet applications. By exploiting the diamagnetic property of superconducting MgB2, a novel joint design successfully achieved magnetic field screening effect, while maintaining a constant critical current.

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Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

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Summary: This study fabricated a superconducting joint using unreacted monofilament internal magnesium diffusion-processed magnesium diboride (MgB2) wires, which demonstrated nearly identical transport current as the bare wire in a strong magnetic field and exhibited very low joint resistance. This work represents the first successful realization of a superconducting joint capable of transferring current without notable degradation under strong magnetic fields, showcasing the great potential of MgB2 for practical applications.

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Superconducting joints using multifilament MgB2 wires for MRI application

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Summary: The study introduced superconducting joints made with 36 filaments magnesium diboride wires, showing characteristics with a critical temperature of 34.4K and critical current of 38.5A at 10K. Unconventional behavior of the joint was observed at 20K due to field trapping in the MgB2 bulk.

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Preparation of a small-size superconducting joint for C-doped 30-filament MgB2 wires

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Summary: This paper presents a preparation method for a small-size MgB2 superconducting joint for C-doped 30-filament MgB2 wires. An unreacted in situ C-doped monofilament wire is used as the connecting structure, resulting in a joint with good stability and the ability to release heat quickly. The joint shows a superconducting transition with Tc-on = 33.49 K and negligible resistance below 30.56 K, with approximately 40% J(c) value of the parent 30-filament wire at 4.2 K.

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High performance superconducting joint for MgB2 films

Chen Guo et al.

Summary: In this article, superconducting joints for MgB2 films were successfully fabricated using sol-gel derived Mg(BH4)2Et2O as the glue. The two types of MgB2 joints showed excellent superconducting performance with high critical temperature (TC) of 40 K, high critical current (IC) of 340 mA at 0 T, and good current capacity in magnetic fields up to 4 T.

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Development of a persistent-mode NMR magnet with superconducting joints between high-temperature superconductors

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Summary: This paper describes the first persistent-mode medium magnetic field nuclear magnetic resonance (NMR) magnet using superconducting joints between high-temperature superconductors (HTS), aiming to develop a high-resolution NMR magnet. By developing superconducting joints between HTSs and HTSs/LTSs, the authors have successfully demonstrated a magnet that functions properly in a high-resolution NMR system.

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MgB2 for MRI applications: dual sintering induced performance variations in in situ and IMD processed MgB2 conductors

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Persistent current joints between technological superconductors

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Persistent Mode MgB2 Short Windings

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A Superconducting Joint Technique for MgB2 Round Wires

Weijun Yao et al.

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A solid nitrogen cooled MgB(2) Demonstration coil for MRI applications

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Recent development of MgB2-based large scale applications

Roberto Penco et al.

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High performance new MgB2 superconducting hollow wires

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Superconductivity at 39 K in magnesium diboride

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