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Superconducting properties of powder-in-tube MgB2 tapes prepared with fine powders

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5 Author(s)
H. Yamada ; Gen. Technol. Div., Central Japan Railway Co., Komaki, Japan ; M. Hirakawa ; H. Kumakura ; A. Matsumoto
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It is necessary to increase the Jc values to develop useful MgB2 tape. We investigated superconducting properties of in situ processed Powder-In-Tube (PIT) MgB2 tapes prepared with fine powders. Fine crystalline Mg powder with the average particle size of about 300 nm was fabricated by applying the thermal plasma method. In addition, 5∼15 mol% SiC powder doping was tried to enhance the Jc values. The transport Jc value of the 10 mol% SiC-doped tapes reached 250 A/mm2 at 4.2K and 10 T. Furthermore we measured the upper critical field, Bc2, and the irreversibility field, Birr, of the tapes. At 4.2K, the Bc2 and Birr of the SiC-doped tape reached 24 T and 21.5 T, respectively. This Birr was almost equal to the Bc2 of a conventional bronze-processed Nb3Sn conductor. At 20 K, the extrapolated Birr was around 9 T, which was comparable to the Bc2 of commercial NbTi at 4.2 K. These results indicate that MgB2 tape is promising not only for the high-field applications but also for the applications at 20 K with a convenient cryocooler.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:15 ,  Issue: 2 )