High performance, advanced-internal-magnesium-infiltration (AIMI) MgB₂ wires processed using a vapor-solid reaction...

Area of Science:

• Materials Science
• Superconductivity
• Applied Physics

Background:

• Magnesium diboride (MgB₂) wires are crucial for superconducting applications.
• MgB₂ wires fabricated via Mg infiltration show high performance.
• Previous multicore wires suffered from non-uniform MgB₂ layers, limiting critical current density (J_e).

Purpose of the Study:

• To improve the performance of multicore MgB₂ wires.
• To achieve higher and more uniform J_e in 18-core MgB₂ wires.
• To investigate the effect of processing routes on MgB₂ layer formation.

Main Methods:

• Fabrication of 18-core MgB₂ wires using the Advanced Infiltration and Muitiple-Infiltration (AIMI) method.
• Processing wires via a low-temperature route.
• Analysis of MgB₂ layer uniformity and reaction mechanisms.

Main Results:

• 18-core MgB₂ AIMI wires processed at low temperatures exhibited enhanced and uniform J_e values.
• Uniform MgB₂ reaction layers were formed in the multicore wires.
• The improved uniformity is attributed to a shift from liquid-solid to vapor-solid reaction pathways.

Conclusions:

• Low-temperature processing of multicore MgB₂ wires via the AIMI route significantly enhances superconducting performance.
• Uniform MgB₂ layer formation is key to achieving high J_e in practical superconducting wires.
• The vapor-solid reaction mechanism offers a promising route for advanced MgB₂ wire fabrication.