Improved Superconducting Properties in Bismuth Strotium Calcium Copper Oxide Multifilament Conductors Processed by Hot Rolling and Hot Drawing

虽然高温Bi-2212超导体已被制成圆形多丝实用导体形式，并显示出良好的商业化潜力（在4.2K时Jc为165,000 A/cm2），但仍然需要使用可扩展的技术来实现高均匀性，良好的密度和长导线的高临界电流密度（Jc）。本文提出的工作将使用热轧和热拉伸作为一种手段来证明这种方法在HTS Bi-2212复合导体中获得改善的织体、密度和均匀性的可行性。在该计划的第一阶段，将集中精力优化与热加工相关的工艺参数。第一阶段的成功将导致第二阶段扩大更长的和/或坯料的热加工规模，以重复和持续地获得良好的超导性能，从而显著节省成本。

Although high temperature Bi-2212 superconductors have been fabricated in round multifilamentary practical conductor form and have demonstrated excellent potential (Jc 165,000 A/cm2 at 4.2K) for commercialization, the need still exists to use scalable techniques to achieve high uniformity, good densification and high critical current densities (Jc) in long lengths of wire. The work proposed here will use hot rolling and hot drawing as a means to demonstrate the feasibility of this approach to obtain improved texture, density and uniformity in HTS Bi-2212 composite conductors. During Phase I of this program, efforts will concentrate on optimizing process parameters associated with hot processing. Success in Phase I will lead to scale up of the hot processing of longer lengths and/or billets in Phase II, to reproducibly and consistently achieve good superconducting properties resulting in significant cost savings.