Microstructural Parameters for Modelling of Superconducting Foams

Michael Rudolf Koblischka; Anjela Koblischka-Veneva; Quentin Nouailhetas; Ghazi Hajiri; Kévin Berger; Bruno Douine; Denis Gokhfeld

doi:10.20944/preprints202203.0167.v2

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preprints.org > chemistry and materials science > materials science and technology > doi: 10.20944/preprints202203.0167.v2

Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Microstructural Parameters for Modelling of Superconducting Foams

Michael Rudolf Koblischka

^* ,

Anjela Koblischka-Veneva

Version 1 : Received: 10 March 2022 / Approved: 11 March 2022 / Online: 11 March 2022 (10:12:28 CET)
Version 2 : Received: 16 March 2022 / Approved: 16 March 2022 / Online: 16 March 2022 (14:15:15 CET)

A peer-reviewed article of this Preprint also exists.

Koblischka, M.R.; Koblischka-Veneva, A.; Nouailhetas, Q.; Hajiri, G.; Berger, K.; Douine, B.; Gokhfeld, D. Microstructural Parameters for Modelling of Superconducting Foams. Materials 2022, 15, 2303. Koblischka, M.R.; Koblischka-Veneva, A.; Nouailhetas, Q.; Hajiri, G.; Berger, K.; Douine, B.; Gokhfeld, D. Microstructural Parameters for Modelling of Superconducting Foams. Materials 2022, 15, 2303.

Abstract

Superconducting YBa2Cu3Oy (YBCO) foams were prepared using commercial open-cell, polyurethane foams as starting material to form ceramic Y2BaCuO5 (Y-211) foams which are then converted into superconducting YBCO by using the infiltration growth process. For modelling the superconducting and mechanical properties of the foam samples, a Kelvin-type cell may be employed as a first approach like done in the literature for pure polyurethane foams. However, for a refined model of a superconducting foam sample, the real sample structure must be considered. Thus, a proper description of the specific microstructure of the superconducting YBCO foams is required. A variety of parameters including the cell size and shape, the window size and shape, the length and shape of the foam struts or ligaments and the respective angles of intersection are used to describe the real foam structure. To obtain a set of reliable data, YBCO foam samples were investigated using optical microscopy, SEM and electron backscatter diffraction (EBSD). The detailed investigation of the foam microstructure reveals not only the differences to the polymeric foams used as base material, but also gives insight to details of the infiltration growth process via the increased surface amount in a foam sample.

Keywords

Superconducting foams; YBCO; microstructure; modelling parameters; foam cells; current flow

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comments (1)

Comment 1

Received: 16 March 2022
Commenter: Michael Koblischka
Commenter's Conflict of Interests: Author

Comment: changed abstract, changed Fig.3, added more discussion, added more references

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