Effect of Interim Annealing on Mechanical Strength of TFA-MOD Derived YBCO Coated Conductors☆
Effect of Interim Annealing on Mechanical Strength of TFA-MOD Derived YBCO Coated Conductors☆
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中间退火对 TFA-MOD 衍生 YBCO 涂层导体机械强度的影响☆
DOI：
10.1016/j.phpro.2014.09.024
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Shiohara
中科院分区：
文献类型：
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作者：
Y. Takagi;K. Nakaoka;Tatsunori Nakamura;Masa;T. Kiss;T. Izumi;Y. Shiohara
由于成本效益，TFA-MOD派生的YBCO磁带有望用于许多应用。在某些应用中，对磁带的均匀性和机械强度要求很高。采用转变前的中间退火工艺制备了205m长的YBCO带材，整个带材具有高而均匀的Ic性能。本文研究了中间退火对YBCO晶体生长机制的影响，重点研究了中间退火条件与分层的关系。用螺柱拉伸法对中间退火法和未退火法制备的样品的分层强度进行了评估。每个样本在50个不同的点进行测量，并对结果进行统计分析。两种材料的剥离强度在60℃以下有显著差异。常规退火组的剥离强度在60℃以下的点数比临时退火组多。扫描电子显微镜观察两种样品的横截面图像表明，虽然常规超导层有大量的孔洞，但中间退火后的超导层内部几乎没有孔洞。这些结果表明，YBCO层内的孔洞可能是低强度下分层扩展的来源。
TFA-MOD derived YBCO tapes are expected for many applications due to cost-efficiency. In some applications, uniformity and mechanical strength are required for tapes. A 205 m-long YBCO tape was fabricated with high and uniformIc performance throughout the tape by adopting the interim annealing before the conversion process. The effect of the interim annealing on the crystal growth mechanism of YBCO has been studied focusing on the relationship between the interim annealing conditions and delamination, in this work. Delamination strength was evaluated in the samples prepared with and without interim annealing by the stud pull method. Measurements were carried out on 50 different points for each sample and the results were analyzed statistically. The difference between the two samples was remarkably seen in the delamination strength below 60 MPa. The conventionally annealed sample had more points with low delamination strength below 60 MPa than the interim annealed one. The cross sectional images of both samples observed by SEM showed that there were few pores within the interim annealed superconducting layer, although conventional superconducting layer had many pores. These results suggest that the pores within YBCO layer might be origins to be propagated for delamination at low strength.
采用先进的 TFA-MOD 方法研究起始材料对 YBCO 涂层导体超导性能的影响
DOI：
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发表时间：
2007
期刊：
影响因子：
--
作者：
K. Nakaoka;M. Miura;他11名
通讯作者：
他11名