Expedited Award for Novel Research: Investigation of the Novel Processing Technique for Fabrication of Flexible High Tc Superconducting Wire

本项目涉及一种制造技术， 采用新工艺的柔性超导导线 钇-钡-铜-氧系复合材料及其制备工艺 加上银氧化物。 在加工过程中，氧气 陶瓷超导材料的化学计量将是 保持在所需水平，从而避免了需要 通过热处理再生超导性。 以前的工作使用 光学和扫描电子显微镜显示， 微观结构和无裂纹。 断裂的表面显示 复合材料的混合模式断裂行为， 延展性的证据。 挤压金属丝显示迈斯纳 在一个显着的高场效应和磁 磁化率测量显示起始温度为91 K。 本项目旨在优化工艺参数， 改善了挤压的织构，并因此改善了挤压的电流密度 钢丝. 还可能的是，烧结的坯段可以是冷的， 挤出用于较低的挤出比和后处理退火 挤出的金属丝可以被拉伸到更精细的尺寸。 另一 超声波拉丝新工艺 制造这些超导陶瓷的细软线 复合材料也将在这个项目中进行探索。

This project deals with a fabrication technique for producing flexible superconductor wire by employing a novel processing technique and a composite of yttrium-barium-copper-oxygen system plus silver oxide. During the course of processing, the oxygen stoichiometry of the ceramic superconducting material will be maintained at the desired level, thus obviating the need to regenerate superconductivity by heat treatment. Prior work using an optical and a scanning electron microscope revealed a dense microstructure and absence of cracks. Fractured surface showed the mixed mode fracture behavior of the composite material and the evidence of ductility. The as-extruded wires showed Meissner effect at a significantly high field and the magnetic susceptibility measurements showed the onset temperature of 91K. This project is addressed to optimize the process parameters, to improve texture and hence the current density of the extruded wire. It is also possible that the sintered billet can be cold extruded for lower extrusion ratios and after process annealing the extruded wire can be drawn to finer dimensions. Another novel processing technique of ultrasonic wire drawing for fabricating fine flexible wires of these superconducting ceramic composites will also be explored in this project.