Transport currents in Bi-2223/Ag tapes made using the tape-in-rectangular tube process, current distribution and Ic stress degradation
Transport currents in Bi-2223/Ag tapes made using the tape-in-rectangular tube process, current distribution and Ic stress degradation
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使用矩形管带工艺制成的 Bi-2223/Ag 磁带中的传输电流、电流分布和 Ic 应力衰减
DOI：
10.1088/0953-2048/15/4/324
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发表时间：
2002
影响因子：
3.6
通讯作者：
B. Haken
中科院分区：
文献类型：
--
作者：
P. Kováč;I. Hušek;T. Melíšek;A. Metz;H. J. Eck;B. Haken
利用矩形管内带材（TIRT）工艺，我们制备了具有不同芯数（10 - 162根）以及不同芯丝结构和取向的多芯Bi - 2223/Ag带材。我们测量了具有“平行”和“垂直”芯丝的带材样品传输电流的角度依赖性。通过空间分辨传输测量（“磁刀”）获得的横向临界电流（Ic）分布表明，TIRT带材在带材边缘的芯丝质量优于中心。带材通过两种类型的拉伸装置（短直样品和U形弹簧）以及在77K下弯曲进行应力测试。对于平行和垂直芯丝，临界电流（Ic）的退化表现出不同的行为，这归因于芯丝密度和裂纹扩展的差异。
Using the tape-in-rectangular tube (TIRT) process, we have made multi-core Bi-2223/Ag tapes with various numbers of filaments (10?162), and with different filament architectures and orientations. We have measured the angular dependence of the transport current of the tape samples with 'parallel' and 'perpendicular' filaments. The transversal Ic distribution obtained by spatially resolved transport measurements ('magnetic knife') illustrates that the filament quality of the TIRT tapes is better at the tape edges than in the centre. The tapes were stressed by two types of tensioning set-up (a short straight sample and a U-shaped spring) and by bending at 77 K. The Ic degradation shows different behaviour for parallel and perpendicular filaments, which is attributed to the difference in filament density and crack propagation.