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

被引:53
作者
Jiang, Jianyi [1 ]
Miao, Hanping [2 ]
Huang, Yibing [2 ]
Hong, Seung [2 ,3 ]
Parrell, Jeff A. [2 ]
Scheuerlein, Christian [4 ]
Di Michiel, Marco [5 ]
Ghosh, Arup K. [6 ]
Trociewitz, Ulf P. [1 ]
Hellstrom, Eric E. [1 ]
Larbalestier, David C. [1 ]
机构
[1] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
[2] Oxford Superconducting Technol, Carteret, NJ 07008 USA
[3] HJC Enterprise, New Providence, NJ 07974 USA
[4] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland
[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[6] Brookhaven Natl Lab, Upton, NY 11973 USA
基金
美国国家科学基金会;
关键词
Bi-2212; critical current density; high temperature superconductor; superconducting magnets; SUPERCONDUCTING PROPERTIES; TAPES; DEFORMATION;
D O I
10.1109/TASC.2013.2237873
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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 (J(E)) of 810 A/mm(2) at 5 T, 4.2 K. Here we report on densifying Bi-2212 wire by swaging, which increased J(E) (4.2 K, 5 T) from 486 A/mm(2) for as-drawn wire to 808 A/mm(2) for swaged wire. This result further confirms that enhancing the filament packing density is of great importance for making major J(E) improvements in this round-wire magnet conductor.
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页数:6
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