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

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.