${\rm MgB}_{2}$ Superconductive Inserts: Products Between Bulks and Wires

Abstract

A new series of superconductive products is presented. With the aim to growth HTS material inside grooved substrates, it has been discovered that the MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> material can be used in a very convenient and versatile way for this kind of manufacts. Applying the well established Reactive Liquid Mg Infiltration (Mg-RLI) technology, to produce MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , we prepare large plates, cylinders, bars, decorated by different shapes of superconductive inserts made by MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> strips. The substrate material of the insert can be varied according to the needs. The Superconductive Inserts in Metallic Substrates (SIMS) show a mechanical robustness very useful for brittle ceramic like HTS superconductors. The superconducting behavior of the MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -SIMS accounts for the advantages of the bulks and of the wires manufacts together. The superconducting characteristics of the SIMS have been checked by transport and magnetization measurements, and the critical current density has the values typical of the well sintered MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> bulk manufacts. The first outstanding applications of SIMS can be magnetic shields, current leads and superconducting permanent magnets.