High-temperature superconducting tape repairing method

By heat treatment of the bad point areas of high-temperature superconducting strips, the local bad point problems caused by process stability deviation are solved, the recovery of current carrying capacity and the improvement of product yield is achieved, and the length and cost losses caused by truncation are avoided.

CN119694666AActive Publication Date: 2025-03-25INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202411891601.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-25
Estimated Expiration
2044-12-20

AI Technical Summary

Technical Problem

During the manufacturing process, the performance of existing high-temperature superconducting strips deteriorates in a certain area due to process stability deviations, forming local bad points, seriously reducing the current carrying capacity of the entire long belt. They have to cut off the entire long belt from both sides of the bad point, resulting in a significant reduction in product length and yield.

Method used

A high-temperature superconducting strip repair method is adopted to repair the damaged point area by appropriate heat treatment, including maintaining a certain partial oxygen pressure in the reaction vessel and annealing, so that the damaged point area can be repaired without destroying the original strip.

Benefits of technology

This repair method can completely restore the superconducting transition temperature of the bad point, increase the critical current density of the bad point, restore the current carrying capacity to 95%-110% of the normal value, and greatly improve the yield rate of the strip and reduce the preparation cost.

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Abstract

The invention discloses a method for repairing a high-temperature superconducting tape. The method comprises the following steps: S1, placing a to-be-repaired area of the high-temperature superconducting tape in a reaction container; s2, the reaction container is kept at a certain oxygen partial pressure, and annealing treatment is conducted on the to-be-repaired area; s3, after annealing treatment is completed, the high-temperature superconducting tape is taken out after the reaction container is cooled; wherein the to-be-repaired area is a dead pixel area in the high-temperature superconducting tape and an area with a certain length on two sides of the dead pixel area in the length direction of the tape. According to the repairing method, cutting treatment is not needed, that is, the original strip does not need to be damaged basically, and the dead pixel area can be repaired only by conducting proper heat treatment on the dead pixel area.
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