High-Performance Bi-2212 Round Wires Made With Recent Powders
High-Performance Bi-2212 Round Wires Made With Recent Powders
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DOI：
10.1109/tasc.2019.2895197
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发表时间：
2019-08-01
影响因子：
1.8
通讯作者：
Larbalestier, David C.
中科院分区：
文献类型：
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作者：
Jiang, Jianyi;Bradford, Griffin;Larbalestier, David C.
采用管内粉末技术制造的多丝 Bi2Sr2CaCu2Ox (Bi-2212) 线是磁体制造商首选的唯一一种圆形高温超导体。近年来超压热处理技术的发展使Bi-2212圆线的临界电流密度（J(C)）得到显着提高。 Bi-2212 导线可提供多种结构和千米长的商用导线，对于极高场核磁共振和加速器磁体来说是一种非常有前途的导体。我们研究了前驱体粉末和热处理条件对最新 Bi-2212 线的超导性能和微观结构的影响。经过优化过压处理的最新焊丝短样品显示 J(C)(4.2 K,15 T) = 6640 A/mm(2) 和 J(C) (4.2 K, 30 T) = 4670 A/mm(2)，对应于工程临界电流密度 J(E) (4.2 K, 15 T) = 1320 A/mm 2 和 J(E) (4.2 K, 30 T) = 930 安/毫米(2)。
Multifilamentary Bi2Sr2CaCu2Ox (Bi-2212) wire made by the powder-in-tube technique is the only high-temperature superconductor made in the round shape preferred by magnet builders. The critical current density (J(C)) of Bi-2212 round wire was improved significantly by the development of overpressure heat treatment in the past few years. Bi-2212 wire is commercially available in multiple architectures and kilometer-long pieces and is a very promising conductor for very high-field NMR and accelerator magnets. We studied the effects of precursor powder and heat treatment conditions on the superconducting properties and microstructure of recent Bi-2212 wires. Short samples of recent wire with optimized overpressure processing showed J(C)(4.2 K,15 T) = 6640 A/mm(2) and J(C) (4.2 K, 30 T) = 4670 A/mm(2), which correspond to engineering critical current densities J(E) (4.2 K, 15 T) = 1320 A/mm 2 and J(E) (4.2 K, 30 T) = 930 A/mm(2).