Superconducting and thermal properties of ex-situ Glidcop sheathed multifilamentary MgB2 wires

TL;DR

This study investigates ex-situ multifilamentary MgB2 superconducting wires with GlidCop sheaths, focusing on their thermal and superconducting properties to evaluate their suitability for high thermal conductivity applications above 30K.

Contribution

It demonstrates the effectiveness of GlidCop as a sheath material in MgB2 wires, highlighting the impact of dispersed Al2O3 particles on properties and application potential.

Findings

GlidCop sheaths improve thermal conductivity and mechanical stability.

Critical current density remains reasonable with GlidCop sheaths.

Suitable for high thermal conductivity applications above 30K.

Abstract

In DC and AC practical applications of MgB2 superconducting wires an important role is represented by the material sheath which has to provide, among other things, a suitable electrical and thermal stabilization. A way to obtain a large enough amount of low resistivity material in to the conductor architecture is to use it as external sheath. In this paper we study ex-situ multifilamentary MgB2 wires using oxide-dispersion-strengthened copper (GlidCop) as external sheath in order to reach a good compromise between critical current density and thermal properties. We prepared three GlidCop samples differing by the content of dispersed sub-microscopic Al2O3 particles. We characterized the superconducting and thermal properties and we showed that the good thermal conductivity together the good mechanical properties and a reasonable critical current density make of GlidCop composite wire a useful conductor for applications where high thermal conductivity is request at temperature above 30K, such as Superconducting-FCL.