拉伸应力下的高温超导带材临界电流特性研究

针对在低温、拉伸应力共同作用下,高温超导带材临界电流测量困难的问题,详细介绍了一种独立改造后的简便拉伸设备,利用四引线法对两种具有代表性的高温超导带材的临界电流进行了测量,并对结果进行了一系列的验证,证明了此设备能较好的完成测量任务。最后,结合带材的物理结构,简要分析了临界电流产生变化的原因。对今后的测量工作和超导磁体的设计与制备有一定的指导意义。

Critical current of HTS tape under tensile stress

In this paper,the critical current was measured for two kinds of high temperature superconductor(HTS) tapes under different tensile stress.A reformed tensile device was used to apply tensile stress on the tapes to solve the problem of measurement difficulties and the critical current was measured by the four-contact method under 77K.Results show the device is available.At last,analysis on the reason of critical current's change was given considered the physical structure of HTS tape.