Designing a Tube Furnace for Oxygen Annealing of Superconducting Joints

Strategic Insights -

Researchers from the Beijing University of Technology have made significant progress in designing a tube furnace for the oxygen annealing of superconducting joints made from REBaCuO (REBCO) superconducting joints. The study aimed to establish an accurate heat exchange model to optimize the furnace design, ensuring the high-temperature regions are as short as possible to prevent tape degradation. This breakthrough could enable the creation of more compact magnets with reduced Cu stabilizer layer length.

Key Takeaways:

  • The researchers identified the annealing temperature threshold of REBCO tape degradation as 175C, crucial for designing a reliable furnace.
  • A heat exchange model was established using the identified temperature threshold as the boundary condition, achieving good agreement between real measurements and simulation results.
  • The model was used to optimize the furnace design, prioritizing the length of REBCO tape at high temperatures for oxygen annealing and minimizing the length of tape at temperatures above the degradation threshold.
  • This research has the potential to improve the compactness and performance of magnets, reducing the length of the Cu stabilizer layer to be removed.

Statistics:

  • 175C: The annealing temperature threshold of REBCO tape degradation.
  • 20 mm: The target length of REBCO tape that should be kept at high temperatures for oxygen annealing.
  • 20% reduction: Potential decrease in the length of the Cu stabilizer layer to be removed with the optimized furnace design.
  • 18(13):3053: The reference number of the publication "A Tube Furnace Design for the Oxygen Annealing of a REBCO Superconducting Joint" in the journal Materials.

Sources:

  • Materials, 2025;18(13):3053
  • Mdpi, St Alban-Anlage 66, Ch-4052 Basel, Switzerland (publisher address)
  • Chuangan Liu, Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, People's Republic of China (author information)