Critical current retention in axially strained reinforced first-generation high-temperature superconducting Bi2223 wire
Critical current retention in axially strained reinforced first-generation high-temperature superconducting Bi2223 wire
复制标题
轴向应变增强第一代高温超导 Bi2223 线材的临界电流保持率
DOI：
10.1088/0953-2048/18/12/014
复制
发表时间：
2005
影响因子：
3.6
通讯作者：
R. Mason
中科院分区：
文献类型：
--
作者：
A. Otto;E. Harley;R. Mason
通过轴向拉伸和压缩应变加载以及原位临界电流测试，研究了第一代高温超导（HTS）线材在轴向应变条件下添加增强材料对保持临界电流（Ic）的影响。制备了不同厚度镀铜、镀镍增强层的BSCCO/Ag复合丝带，以及不同宽度、厚度和预紧力的不锈钢、不胀钢和钼焊料层压带材，并进行了测试。基于预应力、热膨胀系数（CTE）、几何形状和组装方法的选择，发现>95%保留的Ic应变窗口以可预测的方式偏移。钢筋中较高的CTE和预应力使应变窗口向拉伸侧移动。所有增强材料的应变窗口的大小增加，与未增强的BSCCO-Ag复合材料相比，较高模量的材料线性增加应变窗口高达两倍。开发了一个模型，用于根据增强材料特性、预应力和工艺变量计算应变窗口的位置和大小。增加应变窗口尺寸和调整其位置的能力增强了第一代和第二代HTS导线的实用性。
The effect of attaching reinforcing materials to first-generation high-temperature superconducting (HTS) wires on retained critical current (Ic) in axial strain conditions was established by axial tensile and compressive strain loading and in situ Ic tests. Tape-shaped BSCCO/Ag composite wires with copper and nickel plated reinforcing layers of different thickness and tapes with solder-laminated stainless steel, invar and molybdenum with different widths, thicknesses and pre-stresses were made and tested. The >95% retained Ic strain window was found to be shifted in a predictable manner based upon the choice of pre-stress, coefficient of thermal expansion (CTE), geometry and assembly method. Higher CTE and pre-stress in the reinforcement shifted the strain window into the tensile side. All reinforcing materials increased the size of the strain window, with higher modulus materials linearly increasing the strain window by up to two-fold compared to the unreinforced BSCCO-Ag composite. A model was developed to calculate the strain window location and size from reinforcement material properties, pre-stress and process variables. The ability to increase the strain window size and to tailor its location enhances the utility of both first- and second-generation HTS wires.