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Reduction of Gas Bubbles and Improved Critical Current Density in Bi-2212 Round Wire by Swaging

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11 Author(s)
Jianyi Jiang ; Nat. High Magn. Field Lab., Florida State Univ., Tallahassee, FL, USA ; Hanping Miao ; Yibing Huang ; Seung Hong
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Bi-2212 round wire is made by the powder-in-tube technique. An unavoidable property of powder-in-tube conductors is that there is about 30% void space in the as-drawn wire. We have recently shown that the gas present in the as-drawn Bi-2212 wire agglomerates into large bubbles and that they are presently the most deleterious current-limiting mechanism. By densifying short 2212 wires before reaction through cold isostatic pressing, the void space was almost removed and the gas bubble density was reduced significantly, resulting in a doubled engineering critical current density (JE) of 810 A/mm2 at 5 T, 4.2 K. Here we report on densifying Bi-2212 wire by swaging, which increased JE (4.2 K, 5 T) from 486 A/mm2 for as-drawn wire to 808 A/mm2 for swaged wire. This result further confirms that enhancing the filament packing density is of great importance for making major JE improvements in this round-wire magnet conductor.

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Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 3 )