Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.14: Poster

Montag, 22. März 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 Schlenga³ — ¹IFW 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.