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Microstructural Parameters for Modelling of Superconducting Foams.

Michael Rudolf Koblischka1, Anjela Koblischka-Veneva1, Quentin Nouailhetas1,2

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Researchers developed superconducting Yttrium Barium Copper Oxide (YBCO) foams for potential applications. Microstructural analysis revealed key structural features influencing superconducting properties and trapped magnetic fields.

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Area of Science:

  • Materials Science
  • Superconductivity
  • Ceramics

Background:

  • Superconducting Yttrium Barium Copper Oxide (YBCO) foams offer potential for advanced applications.
  • Previous modeling of foam properties used simplified structures like Kelvin cells.
  • Understanding the real microstructure is crucial for optimizing YBCO foam performance.

Purpose of the Study:

  • To prepare superconducting YBCO foams using polyurethane precursors.
  • To model and experimentally evaluate the trapped magnetic fields (TFs) in these foams.
  • To characterize the microstructure of YBCO foams for improved property prediction.

Main Methods:

  • Preparation of YBCO foams via infiltration growth from polyurethane templates.
  • Modeling of superconducting and mechanical properties using Kelvin cell approximations.
  • Experimental measurement of trapped fields at 77 K.
  • Microstructural analysis using optical microscopy, scanning electron microscopy, and electron backscatter diffraction (EBSD).

Main Results:

  • Initial modeling provided insights into foam structures for high trapped fields.
  • Experimental results at 77 K were compared with modeling predictions.
  • Microstructural characterization revealed differences from the original polymer foam.
  • Detailed analysis of cell size, strut morphology, and intersection angles provided a comprehensive description of the YBCO foam microstructure.

Conclusions:

  • Simple models offer initial insights but a refined model incorporating real microstructure is necessary for accurate prediction of YBCO foam properties.
  • Microstructural characterization is essential for understanding and optimizing superconducting and mechanical behaviors.
  • The internal surface area of the foam structure plays a significant role in the infiltration growth process.