Multifilamentary MgB2 Wires Prepared by an In Situ Powder-in-Tube Method

MgB 2 has become a commercially attractive material for technological applications for its particular superconducting properties. However, due to its brittleness to obtain wires, a metallic sheath is needed for drawing. In the present work, grade 2 titanium has been used as sheath material, and seve...

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Bibliographic Details
Published inJournal of low temperature physics Vol. 179; no. 1-2; pp. 119 - 125
Main Authors Sobrero, C. E., Vallejos, J. M., San Martin, V., Malachevsky, M. T., Serquis, A. C.
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.04.2015
Subjects
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Ti
MgB
In situ
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Summary:MgB 2 has become a commercially attractive material for technological applications for its particular superconducting properties. However, due to its brittleness to obtain wires, a metallic sheath is needed for drawing. In the present work, grade 2 titanium has been used as sheath material, and several multifilamentary wires have been prepared. The powder-in-tube method has been used to prepare the wires with the in situ variant, where the sheath is filled with the unreacted precursor powders (Mg and B). Different thermal treatments have been investigated including several intermediate treatments during the drawing process in addition to the final one. This last treatment is necessary to accomplish the synthesis and heal the cracks generated during the cold work. The superconducting properties were determined by magnetization measurements on a SQUID magnetometer, and the microstructure evolution was followed by TEM and SEM microscopy. Mechanical behavior is also evaluated.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-014-1229-y