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Influence of heat-treatment schedules on the transport current densities of long and short segments of superconducting MgB2wire

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
407
Identifiers
DOI: 10.1016/j.physc.2004.05.013
Disciplines
  • Physics

Abstract

Abstract Various MgB 2/sheath composite strands have been tested using transport and magnetic measurement techniques. The strands had bimetallic sheaths of (1) Fe/monel, (2) Fe/Cu and (3) Cu/Cu. In strands (1) and (2) the Fe played the role of diffusion barrier. Transport current densities of more than 5 × 10 5 A/cm 2 at 4.2 K in self-field and 2.7 × 10 4 A/cm 2 at 5 T were obtained on short lengths of Fe/monel strand. In coils, 6 × 10 4 A/cm 2 in 1 T at 4.2 K for Cu/Cu sheath strands and 2.2 × 10 5 for Fe/monel sheath strands have been measured. The strands had diameters of 0.8–1.1 mm and superconducting fractions ranging from 27% to 40% of the total wire cross-section. They were heat-treated (HT) at temperatures of from 675 to 900 °C under various heat-treatment schedules. The best results were obtained at 675 °C for Cu/Cu and 700 °C for Fe/monel strands.

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