Research Progress of Nb_3Al Superconducting Wire for High-Field Application
Research Progress of Nb_3Al Superconducting Wire for High-Field Application
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作者：
Cui Liju
Nb_3Al超导体的超导转变温度（Tc）和上临界磁场（Hc_2）与Nb_3Sn相似，但具有更好的应变容限和更高的高场临界电流（Jc）。因此，Nb_3Al超导体被认为是一种非常有吸引力的材料，用于未来的高场应用。目前，Nb3Al超导线材具有2. 6km长的长度已被报道，表现出1 000 A/mm2 at4的大Jc。2 K和15 T。由于制造技术的复杂性，它不能商业化应用。本文介绍了Nb_3Al合金的基本性能，如扩散空间小、硬度差大、低温热处理非化学计量比等。此外，还对各种先驱体制备、热处理和覆铜技术进行了介绍和比较，并着重分析了制备工艺的难点。最后对Nb_3Al超导体的发展前景进行了展望。
The superconducting transition temperature( Tc) and upper critical magnetic field( Hc2) of Nb3Al superconductor are similar to Nb3Sn,but it has better strain tolerance and higher critical current( Jc) at high field. Therefore,Nb3Al superconductor is considered as a very appealing material for use in future high field application. At present,the Nb3Al superconducting wire with 2. 6 km long length had been reported,which exhibited a large Jcof 1 000 A / mm2at4. 2 K and 15 T. Due to the complexity of fabrication techniques,it can not be commercially applied. In this paper,the basic properties of Nb3Al are introduced,such as little diffuse space,large difference in hardness and off-stoichiometric with low temperature heat-treatment. Besides,various precursor fabrication,heat-treatment and Cu cladding techniques are described and compared,and the difficulties of fabrication,processes are analysed especially. In the end,a perspective and future development of Nb3Al superconductor are given.