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

尽管高温Bi2212超导体已经以圆形多丝实用导体的形式制备，并显示出良好的商业化潜力(在4.2K时为JC 165000 A/cm2)，但仍然需要使用可扩展的技术来在长线段中实现高均匀性、良好的致密化和高临界电流密度(JC)。本文提出的工作将以热轧和热拔为手段来论证这种方法在高温超导Bi2212复合导体中获得更好的织构、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在第二阶段扩大较长长度的热加工和/或钢坯的规模，以重复和一致地实现良好的超导性能，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.