高温超导带材经高压液氮浸泡后的性能

Properties of High Temperature Superconductor(HTS)Tape After Soaking in Liquid Nitrogen Under High Pressure

高温超导带材一般运行于高压液氮的环境中,较大的压力可能会导致液氮渗透至带材内部。当带材由低温回温至室温时,汽化的液氮会对材料造成损伤。对高温超导带材进行高压液氮浸泡和回温处理后,对比带材的临界电流值以判断其性能的退化情况,分析不同的超导材料制备方式和封装工艺对液氮渗透的防护能力,并根据实验的结果提出工艺改进方法和应用中的有效保护措施。

The high-temperature superconductor(HTS)tape generally works in the environment of liquid nitrogen under high pressure,and liquid nitrogen may permeate into the interior of the tape because of the high pressure.As a result,the material would be damaged by the vaporized liquid nitrogen when the HTS tape recovers from low temperature to room temperature.In the present paper,the performance degeneration of material was determined after soaking in high-pressure liquid nitrogen and recovering from low temperature to room temperature by comparing the critical current value of the HTS tapes.The ability to defend liquid nitrogen penetration of the tapes with different preparation methods and encapsulation process was also analyzed.Then the improvement on production technique and effective protective measures in the application were proposed according to the results of the experiment method.