YBa_2Cu_3O_(7-δ)超导带材非均匀性对失超传播特性的影响  

Quench Propagation Characteristics Influenced by Non-Uniform Properties of YBa_2Cu_3O_(7-δ) High Temperature Superconducting Tape

作　　者：杨平 盛杰 王禹程 李柱永 金之俭 洪智勇 YANG Ping SHENG Jie WANG Yucheng LI Zhuyong JIN Zhijian HONG Zhiyong(Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China Shanghai Superconductor Technology Co., Ltd., Shanghai 200240, China)

机构地区：[1]上海交通大学电子工程系,上海200240 [2]上海超导科技有限公司,上海200240

出　　处：《上海交通大学学报》2017年第9期1090-1096,共7页Journal of Shanghai Jiaotong University

基　　金：上海市科学技术委员会感应加热器项目(14DZ1100200)资助

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YBa_2Cu_3O_(7-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.The quench propagation characteristics affected by non-uniform properties are investigated by three different types of YBa_2Cu_3O_（7-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 Idbut 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.

关 键 词：YBA2CU3O7-Δ 超导带材 高温超导 非均匀性 失超 传播速度 

分 类 号：TM263[一般工业技术—材料科学与工程]