Abstract
Al-sheathed MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> superconducting wires were fabricated, using pre-reacted and high-energy ball-milled MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> as starting powders. Although the heat treatment of the wires was carried out at a low temperature (500degC) resulting in an insufficient grain connectivity of MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , high-energy ball-milling was beneficial both for the densification and increasing Jc values. The addition of C to MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> increased the critical current density. The addition of Pb content as high as 50 wt.% did not lower the critical temperature (Tc) of MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , while apparently enhancing densification.
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