Yu Dongmin, Sun Yajie, Zhang Huiming, Meng Yuanzhu, Liu Huanan
Department of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China.
Materials (Basel). 2018 Apr 8;11(4):573. doi: 10.3390/ma11040573.
This paper experimentally analyzes the critical current degradation and AC (alternating current) losses of second-generation (2G) high-temperature superconductor (HTS) tape during the impregnation process. Two impregnation materials were utilized: Gallium-Indium-Tin (GaInSn), and an epoxy resin, Araldite. The critical current of the impregnation materials was measured after different thermal cycles and compared with the tape with no impregnation process. The experimental results show that the critical current of Yttrium Barium Copper Oxide (YBCO) short samples varies between differently impregnated materials. The resin, Araldite, degraded the critical current; however, the GaInSn showed no degradation. Two degradation patterns with Araldite were identified due to the impregnation process, and the corresponding causes were analyzed. We further measured the AC losses of tapes impregnated with liquid metal at different frequencies, up to 600 Hz. Based on the experimental results, GaInSn liquid metal should be the most suitable impregnation material in terms of critical current degradation.
本文通过实验分析了第二代（2G）高温超导（HTS）带材在浸渍过程中的临界电流退化和交流（AC）损耗。使用了两种浸渍材料：镓铟锡（GaInSn）和环氧树脂Araldite。在不同的热循环后测量了浸渍材料的临界电流，并与未经过浸渍过程的带材进行了比较。实验结果表明，钇钡铜氧化物（YBCO）短样品的临界电流在不同的浸渍材料之间有所不同。树脂Araldite使临界电流降低；然而，GaInSn并未导致临界电流降低。由于浸渍过程，确定了Araldite的两种退化模式，并分析了相应的原因。我们进一步测量了在高达600 Hz的不同频率下浸渍液态金属的带材的交流损耗。基于实验结果，就临界电流退化而言，GaInSn液态金属应该是最合适的浸渍材料。
