Advanced Alloy Superconductor Wire Manufacturing Technology

为了支持多芯超导体中的大电流 基于钛合金， 在超导体线中所需的。 制造…的下部结构 100 A的数量级，传统的超导体 制造技术需要相当大量的繁琐的 加工步骤。 通常是5英寸直径的钛合金 铸锭通过挤压和拉丝进行机械加工， 直到获得5微米直径的长丝。 化学 由于偏析而产生的初始铸锭中的不均匀性 合金元素在凝固过程中的溶解通常对 超导体的性质。 一条全新的制造路线 为了制备多相超导体， 其具有生产具有改进的 特点，并大大降低成本。 该方法涉及 制备连续的超导体细丝，典型地40 微米厚，直接来自熔体。 如此细的细丝，当 从熔体中提取的材料经历高固化速率。 的 更高固化速率导致化学均匀 具有极细晶粒尺寸和亚结构的微观结构， 100A级。 该项目将讨论获得理想的 微结构的磁通钉扎和高临界电流密度。 这一发展将使所有 需要大量机械变形的加工步骤。 制备超导体细丝的方法 直接从熔体，到复合丝也将是 探讨了 这项工作将导致重大财产 精细多元复合钛-铝合金的改进 超导体，并大大降低成本， 生产这种电线。 该材料将适用于 广泛的应用，包括偶极子和四极子， 未来的高能加速器磁铁

To support large currents in multifilamentary superconductors based on niobium-titanium alloys, a fine scale substructure is required within the superconductor wire. To produce substructure of the order of 100A, the conventional multifilamentary superconductor fabrication technology requires a rather large number of tedious processing steps. Typically a 5 inch diameter niobium-titanium alloy ingot is mechanically worked through extrusion and wire drawing, until 5 micrometers diameter filaments are obtained. The chemical inhomogeneity in the starting ingots that arises due to segregation of alloying elements during solidification is often deleterious to the superconductor properties. An altogether new manufacturing route for the preparation of multifilamentary superconductors is proposed, which has the potential of producing superconductors with improved characteristics, and significantly lower cost. The approach involves preparing continuous superconductor filaments, typically 40 micrometers thick, directly from the melt. Such thin filaments, when extracted from the melt experience high solidification rates. The high solidification rates lead to a chemically homogeneous microstructure with extremely fine grain sizes and sub-structures of the order of 100A. This project will address the feasibility of obtaining desirable microstructures for flux pinning and high critical current density. This development will obviate all the processing steps requiring extensive mechanical deformation. Approaches to incorporate the superconductor filaments prepared directly from the melt, into composite wires will also be explored. The work will result in significant property improvements in fine multifilamentary composite niobium-titanium superconductors, and considerable cost reduction in the production of such wires. The material will be suitable for a wide range of applications including dipoles and quadrapoles for future high energy accelerator magnets.