Critical current survival in the YBCO superconducting layer of a delaminated coated conductor
Critical current survival in the YBCO superconducting layer of a delaminated coated conductor
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DOI：
10.1088/1361-6668/aaacc4
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发表时间：
2016-12
影响因子：
3.6
通讯作者：
F. Feng;Qishu Fu;T. Qu;H. Mu;C. Gu;Yubin Yue;Linli Wang;Zhirong Yang;Z. Han;P. Feng
中科院分区：
文献类型：
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作者：
F. Feng;Qishu Fu;T. Qu;H. Mu;C. Gu;Yubin Yue;Linli Wang;Zhirong Yang;Z. Han;P. Feng
高温超导涂层导体具有良好的机械性能和临界电流特性，可在电力设备中得到实际应用。然而，涂层导体由于其沿着厚度方向的差的应力耐受性而容易分层。研究分层的YBa 2Cu 3 O 7 −δ（YBCO）层的Ic是否可以保留是很有趣的。在这项研究中，通过金属有机沉积路线制造的涂层导体样品通过液氮浸泡分层。获得了包括YBCO层和银稳定剂的分层样品。扫描电子显微镜（SEM）和X射线衍射结果表明，在YBCO层内部和YBCO-CeO 2界面附近发生了分层。采用扫描霍尔探针系统测量了原始样品和分层样品的Ic分布。据发现，大约50%的IC可以保留分层后，这是验证了使用四探针法的IC测量。通过SEM观察到的剥离表面的致密和无裂纹的形态，这占的IC的剥离层的YBCO层的生存。基于氧扩散估算，讨论了分层样品在超导接头中的潜在应用。
A high-temperature superconducting coated conductor can be practically applied in electric equipment due to its favorable mechanical properties and critical current (Ic) performance. However, the coated conductor can easily delaminate because of its poor stress tolerance along the thickness direction. It would be interesting to investigate whether the Ic of the delaminated YBa2Cu3O7−δ (YBCO) layer can be preserved. In this study, coated conductor samples manufactured through the metal organic deposition route were delaminated by liquid nitrogen immersion. Delaminated samples, including the YBCO layer and silver stabilizer, were obtained. Delamination occurred inside the YBCO layer and near the YBCO–CeO2 interface, as suggested by the results of scanning electron microscopy (SEM) and x-ray diffraction. A scanning Hall probe system was employed to measure the Ic distribution of the original sample and the delaminated sample. It was found that approximately 50% of the Ic can be preserved after delamination, which was verified by Ic measurements using the four-probe method. Dense and crack-free morphologies of the delaminated surfaces were observed by SEM, which accounts for the Ic survival of the delaminated YBCO layer. The potential application of the delaminated sample in superconducting joints was discussed based on the oxygen diffusion estimation.