Performance test of Bi-2212 HTS current leads prepared by the diffusion process
Performance test of Bi-2212 HTS current leads prepared by the diffusion process
复制标题
扩散工艺制备的Bi-2212高温超导电流引线性能测试
DOI：
10.1109/tasc.2002.1018648
复制
发表时间：
2002
影响因子：
1.8
通讯作者：
T. Mito
中科院分区：
文献类型：
--
作者：
Y. Yamada;O. Suzuki;A. Enomoto;K. Tachikawa;H. Tamura;A. Iwamoto;T. Mito
采用双组分扩散工艺制备了电流引线用Bi-2212高温超导体。Bi-2212高温超导层是通过Sr-Ca-Sr氧化物基底和添加Ag的Bi-Cu氧化物涂层之间的扩散反应合成的。HTS扩散层的厚度约为150 μ/m，形成在外径/内径为27/19 mm、长度为200 mm的圆柱形管周围。在4.2 K和自电场下，管状样品的输运电流超过4000 A，对应的输运电流密度为20000 A/cm/sup 2/。接头一端的焦耳热。从12 nU的总接头电阻估计样本的功率为200 mW。因此，在4000 A时，总热负荷（包括在4 K和40 K之间通过管状试样传导的热泄漏）预计小于400 mW。Bi-2212超导导体具有大的输运电流、低的接头电阻和热导率，有望作为超导磁体的电流引线。
Bi-2212 HTS bulk conductors have been prepared by the two components diffusion process for current lead application. The Bi-2212 HTS layer is synthesized through a diffusion reaction between a Sr-Ca-Sr oxide substrate and a Bi-Cu oxide coating with Ag addition. The HTS diffusion layer about 150 /spl mu/m in thickness formed around the cylindrical tube 27/19 mm in outside/inside diameter and 200 mm in length. The transport current of the tubular specimen exceeds 4000 A at 4.2 K and self-field, which corresponds to a transport current density of 20000 A/cm/sup 2/. The Joule heating of the joint at an end. of the specimen is estimated to be 200 mW from the overall joint resistance of 12 nU. Therefore, the total heat load, including heat leakage conducted through the tubular specimen between 4 K and 40 K, is expected to be less than 400 mW at 4000 A. Present Bi-2212 HTS conductors with large transport current as well as low joint resistance and thermal conductivity, seem to be promising as a current lead for superconducting magnets.