环氧浸渍材料厚度对高温超导体失超传播特性的影响研究

研究了不同环氧树脂厚度浸渍的 ReBCO 高温超导带材的最小失超能( MQE) 和失超传播速度(NZPV) ,分析了不同环氧树脂厚度对 ReBCO 高温超导带材的最小失超能和失超传播速度随归一化传输电流的关系. 结果表明,ReBCO 高温超导带材的最小失超能随环氧树脂厚度的增加变化很小;ReBCO 高温超导带材的失超传播速度随着环氧树脂厚度的增加而增大.     

Critical current degradation behaviors of ReBCO coated conductor tapes under pressurized liquid nitrogen

In the case of 2G coated conductor (CC) tapes, it has been reported that thin–thick CC tapes with IBAD substrate showed a superior electromechanical property even at smaller bending radius compared with the cases of 1G BSCCO tapes. Considering the application of CC tapes it is significant to evaluate the transport property under operating environment, because CC tapes might experience a change in operating pressure that can affect its current carrying capacity due to temperature variation and deformation. This study was focused on the I_c degradation behavior in bent CC tapes under pressurized liquid nitrogen. Differently processed YBCO and SmBCO CC tapes with IBAD substrate are used as samples. The bending strain characteristics at elevated pressure levels were evaluated by using the ρ-shaped sample holder which can induce different bending strain values at pressured state. Depressurization and thermal cycling were performed to check the reversibility of I_c in CC tapes. Vacuuming tests were also carried out to investigate the characteristics of I_c at different LN₂ temperature levels.     

液氮浸泡式高性能ReBCO超导带材失超传播特性研究

高性能高温超导带材在大型超导磁体装置上的应用已成为一种趋势,由于存在失超传播速度缓慢、失超检测信号微弱等不足,对失超保护设计提出很大挑战。本文基于液氮浸泡式双保护层的高性能ReBCO带材失超传播特性,采用一维热平衡方程建立失超传播速度的数学模型,通过增加失超源,检测热点温度与电压信号,探究液氮浴环境下的ReBCO带材在传输电流等不同参数下失超传播速度和最小失超能量的变化规律。结果显示:相同条件下,高温超导带材的失超传播速度与传输电流成正相关,最小失超能量与传输电流成负相关,且相比无保护层的普通高温超导带材,具有双保护层的高性能ReBCO临界电流和触发裕度均有提升。