Abstract
Almost all large scale applications of superconductivity use metallic superconductors transporting high current in high magnetic fields. In this work, it was developed a (Nb,Ta) 3Sn multifilamentary superconductor wire using the niobium tube and the internal tin methods. This conductor was projected to be used in a MagnetoHydroDynamic (MHD) energy generator system and it had 222 filaments of NbTa + Cu + Sn distributed in six regions, with Nb diffusion barriers around each one, and a central Cu rod. Several heat treatment profiles of diffusion and reaction of the Sn with the NbTa alloy were used. Microstructural and superconducting characterizations were made. The results showed that heat treatment that presented better critical current densities was 200 °C/50 h + 670 °C/100 h, leading to j c on the superconducting phase around 2800 A/mm 2 at 9 T.
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