Influence of the Precursor Powder on the Processing Window and Current-Carrying Property of Bi-2212 Wires
Influence of the Precursor Powder on the Processing Window and Current-Carrying Property of Bi-2212 Wires
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DOI：
10.1007/s10948-023-06531-6
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发表时间：
2023-03
影响因子：
1.8
通讯作者：
Zhenbao Li;Guoqing Liu;Kai Yao;G. Jiao;Xiaoyan Xu;Q. Hao;L. Jin;Chengshan Li
中科院分区：
文献类型：
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作者：
Zhenbao Li;Guoqing Liu;Kai Yao;G. Jiao;Xiaoyan Xu;Q. Hao;L. Jin;Chengshan Li
采用共沉淀法（CP）和喷雾热分解法（SP）制备了Bi-2212前驱体粉末（Bi：Sr：Ca：Cu = 2.17：1.94：0.89：2.00，2.07：1.94：0.89：2.00）。首先对粉体的特性进行了表征。SP法制备的Bi-2212前驱体粉末的相转变速度快，熔化温度范围（△ T）小，证明SP法制备Bi-2212粉末的效率高，成分均匀性好。并对用这些粉末制备的导线的载流性能和显微组织进行了综合分析。前驱体粉末的性质对丝材的性能有很大的影响。由具有更好的成分均匀性和更高的相纯度的前体粉末制成的线材被证实具有更大的加工窗口（Tp）。此外，发现Bi-2212晶体的平面尺寸的减小改善了线材的加工均匀性和织构。更重要的是，无论是更好的组成均匀性的前体粉末和Bi-2212晶体的较大宽度被发现，以改善内部织构和连接的Bi-2212长丝。本文首次提出了提高Bi-2212线前驱体粉末质量的具体方向，从而既能拓宽Bi-2212线的Tp又能提高其载流性能。
Four batches of Bi-2212 precursor powders prepared by both the co-precipitation method (CP) and the spray pyrolysis technology (SP) with two compositions (Bi:Sr:Ca:Cu = 2.17:1.94:0.89:2.00, 2.07:1.94:0.89:2.00) were obtained. The feature of the powder was firstly characterized. The faster phase evolution and lower melting temperature range (△T) of the precursor powder prepared by SP proved that Bi-2212 powder can be obtained by SP with both a higher preparation efficiency and better composition homogeneity. Then the current-carrying property and microstructure of these wires made from these powders were analyzed comprehensively. The property of the wires was proved to be influenced by the feature of these precursor powders a lot. Wires made by the precursor powder with the better composition homogeneity and higher phase purity were confirmed to hold a larger processing window (Tp). In addition, the decrease of the planar size of Bi-2212 crystals was discovered to improve both the machining homogeneity and texture of the wire. What’s more, both the better composition homogeneity of the precursor powder and the larger width of Bi-2212 crystals were found to improve both the interior texture and connectivity of Bi-2212 filaments. For the first time, the article provided quite specific directions to improve the quality of the precursor powder so as to both broadenTpand enhance the current-carrying property of Bi-2212 wires.