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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.14: Poster

Monday, March 22, 2010, 14:00–18:00, Poster A

Mechanically alloyed MgB2: Effect of the Preparation on the Properties of PIT Wires and Tapes — •Marko Herrmann1, Wolfgang Häßler1, Christian Rodig1, Margitta Schubert1, Ania Kario1, Konstantin Nenkov1, Bernhard Holzapfel1, Ludwig Schultz1, Ludwig Schmolinga2, André Aubele2, Bernd Sailer2, and Klaus Schlenga31IFW Dresden, Dresden, Germany — 2Bruker HTS GmbH, Development HTS, Alzenau, Germany — 3Bruker EAS GmbH, Hanau, Germany

To face the challenge of introducing MgB2 wires and tapes into low temperature applications, it is essential to adapt its preparation to the industrial scale. Only a reasonable interplay of ampacity and an appropriate preparation route, will lead to a widespread use of MgB2 conductors. Mechanical alloying is an excellent technique to adjust the microstructure of the precursor powder and allows for high critical current densities in MgB2. Due to the milling, the morphology and flowability of the powder is affected. To allow for an easy and reliable production of MgB2 wires on the kilometre scale, it is essential to make use of a precursor which can be deformed properly within the sophisticated architecture of a conductor as required for the application. In this paper, the influence of different milling parameters on the microstructure and the superconducting properties of MgB2 is discussed. With increasing milling energy, a refined microstructure and improved homogeneity of the powder and subsequently improved critical current densities are observed. At the same time the changing flowability of the precursor requires an appropriate wire processing.

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