Transactions of the Materials Research Society of Japan
Online ISSN : 2188-1650
Print ISSN : 1382-3469
ISSN-L : 1382-3469
Electronic Materials
Superconducting Properties of In-situ processed MgB2 Tapes Prepared by a Hot Pressing
A. NittaS. OhkiY. YamadaM. NakaoK. TachikawaH. Kumakura
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2008 Volume 33 Issue 2 Pages 315-318

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Abstract
In-situ powder-in-tube processed MgB2 tapes have been prepared through a hot pressing and conventional heat treatment. Magnesium hydride MgH2 and amorphous B powder mixed with SiC powder addition was encased in a carbon steel tube to form a core/sheath composite. The composite was fabricated into a square rod by grooved-rolling, then into a monocore tape 4mm in width and 0.5mm in thickness by flat rolling. The hot pressing was performed under 100 MPa in the temperature range of 630-800°C for 1-10 h in Ar gas atmosphere. The combination of hot pressing during the heat treatment and the addition of SiC nano-sized powder appreciably enhanced the core Jc for the MgB2 tapes. The core Jc at 4.2 K for the 5 mass% SiC addition tape hot pressed at 630°C for 10 h was 125 A/mm2 at 10 T, 500 A/mm2 at 7 T and close to 1,000 A/mm2 at 5 T, respectively. Hot pressing prevented voids due to the volume reduction in MgB2 synthesis reaction, and strengthened the linkage among MgB2 grains. The addition of SiC nano-sized powder enhanced the core Jc, especially the Jc. at high magnetic field due to the improvement of Hc2 and refinement of the MgB2 grains.
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© 2008 The Materials Research Society of Japan
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