Development of Nb tube processed Nb3Al multifilamentary superconductor
Development of Nb tube processed Nb3Al multifilamentary superconductor
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DOI：
10.1007/bf01060206
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发表时间：
1992-03
影响因子：
1.1
通讯作者：
T. Takeuchi;T. Kuroda;K. Itoh;M. Kosuge;Y. Iijima;T. Kiyoshi;F. Matsumoto;Kiyoshi Inoue
中科院分区：
文献类型：
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作者：
T. Takeuchi;T. Kuroda;K. Itoh;M. Kosuge;Y. Iijima;T. Kiyoshi;F. Matsumoto;Kiyoshi Inoue
NRIM（日本）最近开发了铌管工艺，用于制造Nb3Al多丝超导体，其中包含超过100万个直径小于0.1 μm的连续超细细丝。通过添加Mg、Ag（-Ge）、Cu（-Ge）、Zn等合金化铝芯，调整铝芯相对于Nb基体的硬度，显著提高了Nb/Al复合材料的冷加工性能。在1000°C以下热处理的导线表现出比商用（Nb,Ti）3Sn多丝导体更优越的性能：(1)更高的jc (4.2 K) (1.5×109A/m2at 10 T),(2)更小的机械应变降解，(3)更小的交流损耗（由于更小的有效超导丝直径：约2 μm）。此外，对辐照的敏感性与（Nb,Ti）3Sn几乎相同。其他生产Nb3Al的技术不适合开发具有多丝结构的导体，因此铌管加工的Nb3Al多丝导体是核聚变反应堆磁体的最佳选择。
The Nb tube process has recently been developed at NRIM (Japan) for fabricating Nb3Al multifilamentary superconductors containing more than one million continuous ultrafine filaments of less than 0.1 μm diameter. The adjustment of hardness of Al cores relative to Nb matrix by alloying Al cores with additives of Mg, Ag(-Ge), Cu(-Ge), Zn, etc. improved remarkably the cold workability of Nb/Al composites. Wires heat treated below 1000°C show superior properties to a commercial multifilamentary (Nb,Ti)3Sn conductor: (1) higherJc(4.2 K) (1.5×109A/m2at 10 T), (2) smaller degradation inJcwith mechanical strain, and (3) smaller ac loss (resulting from a smaller effective superconducting filament diameter: about 2 μm). Furthermore, sensitivity to irradiation is nearly the same as that of (Nb,Ti)3Sn. Other techniques to produce Nb3Al are unsuitable for developing a conductor with multifilamentary structure, and thereby the Nb tube processed Nb3Al multifilamentary conductors is the best available for fusion reactor magnets.