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

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This study created a novel superconducting joint for magnesium diboride (MgB2) wires. The joint efficiently transfers current without degradation, even in strong magnetic fields, enabling practical applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Superconducting joints are critical for practical applications of superconducting wires.
  • Existing superconducting joints often suffer from performance degradation, especially under magnetic fields.
  • Magnesium diboride (MgB2) is a promising superconductor due to its high critical temperature and mechanical properties.

Purpose of the Study:

  • To fabricate a high-performance superconducting joint for magnesium diboride (MgB2) wires.
  • To investigate the current-carrying capacity and joint resistance of the fabricated MgB2 joint.
  • To demonstrate the potential of MgB2 for applications requiring reliable superconducting connections.

Main Methods:

  • Fabrication of a superconducting joint using unreacted monofilament internal magnesium diffusion-processed MgB2 wires.
  • Exploiting magnesium diffusion into the boron layer within the joint.
  • Transport current measurements in magnetic fields up to 7 Tesla at 20 Kelvin.
  • Joint resistance measurements in self-field at 20 Kelvin.

Main Results:

  • The fabricated MgB2 joint carried a transport current nearly identical to the bare wire in magnetic fields up to 7 T at 20 K.
  • The joint exhibited exceptionally low resistance (2.01 × 10-13 Ω) in self-field at 20 K.
  • This represents the first successful realization of a superconducting joint for MgB2 without notable degradation under strong magnetic fields.

Conclusions:

  • The developed MgB2 superconducting joint demonstrates excellent performance and stability.
  • This breakthrough enables reliable current transfer in demanding environments, overcoming limitations of previous technologies.
  • The findings highlight the significant potential of MgB2 for various practical superconducting applications requiring robust joints.