Ultra-Fine Nb3Al Mono-Core Wires and Cables
Ultra-Fine Nb3Al Mono-Core Wires and Cables
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DOI：
10.1109/tasc.2021.3057323
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发表时间：
2021-08
影响因子：
1.8
通讯作者：
A. Kikuchi;Y. Iijima;S. Nimori;M. Yamamoto;Masahiko Kawano;Motoyoshi Kimura;J. Nagamatsu;M. Otsubo;A. Ichinose;K. Tsuchiya
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文献类型：
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作者：
A. Kikuchi;Y. Iijima;S. Nimori;M. Yamamoto;Masahiko Kawano;Motoyoshi Kimura;J. Nagamatsu;M. Otsubo;A. Ichinose;K. Tsuchiya
使用金属薄箔作为起始材料的果冻辊（JR）加工的线材具有优异的冷加工性和拉拔性。我们成功地制备了外径为50 μm、长度超过400 m的Nb/Al复合单芯线材。此外，还将一些丝的外径拉伸至30 μm。低温扩散反应合成Nb_3Al的临界电流密度（Jc）随着Nb和Al之间扩散距离的减小而增大，在本研究中，我们证实了Jc随着线径的减小而增大，并且在直径为30 μm的Nb_3Al线上获得了最大的Jc。此外，还使用直径为80 μm的导线演示了7线圆形电缆，其Ic是单线Ic的7倍。使用50 mm直径的G10保持器对电缆样品进行模拟W&R和R&W过程的传输电流测试。在W&R和R&W过程中，Ic和n值之间没有差异。此外，作为可行性研究，第三束卢瑟福电缆已成功地制造使用3,108个直径为50 μm的纯铜线。
Jelly-roll (JR) processed wires using metal thin foils as starting materials have excellent cold workability and drawability. We have successfully fabricated Nb/Al composite mono-core wires having 50 μm in outer diameter and over 400 meters in length. Furthermore, some of the wires were additionally drawn to 30 μm in outer diameter. It is known that the critical current density (Jc) of Nb3Al synthesized by low-temperature diffusion reactions increases with decreasing the diffusion distance between Nb and Al. In this study, we have confirmed that Jc would increase with decreasing the wire diameter, and the maximum Jc has been obtained on Nb3Al wires with 30 μm in diameter. In addition, a 7-wire round cable has also been demonstrated using 80 μm diameter wire, with an Ic 7 times the Ic of a single wire. A transport current test was performed for the cable sample simulating W&R and R&W processes using a 50 mm diameter G10 holder. There were no differences between the Ic and the n-values in the W&R and R&W processes. Moreover, as a feasibility study, a 3rd bundle Rutherford cable has been successfully fabricated using 3,108 pure copper wires 50 μm in diameter.