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

虽然高温Bi-2212超导体已经以圆形多功能实用导体的形式制造，并且已经展示出用于商业化的优异潜力（在4.2K下Jc为165，000 A/cm 2），但是仍然存在使用可扩展技术以在长导线长度中实现高均匀性、良好致密化和高临界电流密度（Jc）的需要。这里提出的工作将使用热轧和热拉伸作为一种手段，以证明这种方法的可行性，以获得改善的织构，密度和均匀性的高温超导Bi-2212复合导体。在该计划的第一阶段，工作将集中在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中更长长度和/或坯料的热处理的规模扩大，以可重复地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.