High transport Jc in stainless steel/Ag-Sn double sheathed Ba122 tapes. (14th August 2017)

• Record Type: Journal Article
• Authors: Gao, Zhaoshun; Togano, Kazumasa; Zhang, Yunchao; Matsumoto, Akiyoshi; Kikuchi, Akihiro; Kumakura, Hiroaki
• Is Part Of: Superconductor science & technology. Volume 30:Number 9(2017:Sep.)
• Publication Date: 2017-08-14
• Subjects: Ba122 -- PIT -- tape -- critical current -- Ag-Sn alloy; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aa7bb9
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: In this study, we report that the transport critical current density J c of Ba122 tapes can be significantly enhanced by using the harder stainless steel (SS)/Ag-Sn double sheath. A high J c value of 1.4 × 10 5 A cm −2 (at 4.2 K and 10 T) was achieved in SS/Ag-Sn alloyed double sheathed tapes by cold pressing. Even for as-rolled tapes, the J c exceeds the practical level of 10 5 A cm −2 in magnetic fields up to 10 T. More interestingly, a high J c value of 5.5 × 10 4 A cm −2 at 10 T was obtained by a heat treatment with a very low temperature of 550 °C. The microstructure investigations reveal that the higher core density of the Ba122 tapes with uniform deformation and better grain alignment are responsible for the superior J c -field performance.