YBa2Cu3O7δ超导带材非均匀性
对失超传播特性的影响

doi:10.16183/j.cnki.jsjtu.2017.09.011

摘要/Abstract

摘要： 采用具有点缺陷含铜稳定层、域缺陷不含铜稳定层和域缺陷含铜稳定层的YBa2Cu3O7δ(YBCO) 高温超导带材，在自场温度77K的液氮环境下通过试验研究了YBCO的非均匀性对其失超传播特性的影响规律，分析了非均匀性YBCO的失超传播特性与缺陷临界电流的关系，对比了具有点缺陷与域缺陷含铜稳定层的YBCO的失超传播特性，探讨了含铜稳定层对YBCO失超传播速度的影响，并将试验结果与其模型计算结果进行对比.结果表明：当具有点缺陷含铜稳定层的YBCO带材传输电流低于缺陷临界电流时，YBCO带材能够正常工作而未发生失超；当具有点缺陷含铜稳定层的YBCO带材传输电流高于缺陷临界电流且小于原带材的临界电流时，点缺陷区域发生失超，但其热点未扩散.

关键词: , YBa2Cu3O7&delta, 超导带材, 高温超导, 非均匀性, 失超, 传播速度

Abstract: The quench propagation characteristics affected by nonuniform properties are investigated by three different types of YBa2Cu3O7δ (YBCO) high temperature superconducting tape which are point defect sample with Cu stabilizers, regional defect sample without Cu stabilizers, and regional defect sample with Cu stabilizers. Voltage probes are attached to the samples to measure the normal zone propagation velocity in liquid nitrogen (77K). The applied current is gradually increased to explore the relationship between the quench characteristics and the degraded critical current. The quench characteristics between point and regional defects are compared. Moreover, comparing the experiments with the numerical results, the influence of the stabilizers is also discussed. The experimental results show that there is no quench under degraded critical current (Id). When the transport current is higher than Id but lower than critical current (Ic), quench propagations are different between point defect with Cu stabilizers. The point defect sample quenches only in the defect region.

Key words: YBa2Cu3O7&delta, (YBCO), superconducting tape, high temperature superconducting, nonuniform properties, quench propagations, propagation velocity

中图分类号:

TM 263

杨平1，盛杰1，王禹程2，李柱永1，金之俭1，洪智勇1. YBa2Cu3O7δ超导带材非均匀性
对失超传播特性的影响[J]. 上海交通大学学报（自然版）, 2017, 51(9): 1090-1096.

?YANG Ping1,SHENG Jie1,WANG Yucheng2,LI Zhuyong1,JIN Zhijian1,HONG Zhiyong1. Quench Propagation Characteristics Influenced by NonUniform Properties of
YBa2Cu3O7δ High Temperature Superconducting Tape
[J]. Journal of Shanghai Jiaotong University, 2017, 51(9): 1090-1096.

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