Elimination of Oxygenation Cracking in YBCO Bulk Superconductors

Diko, P.; Chaud, X.; Antal, V.; Kaňuchová, Mária; Šefčiková, M.; Šuster, D.; Kováč, J.

doi:10.4028/www.scientific.net/kem.409.216

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The foams are less prone to cracking caused by magnetostriction [15,16]. The typical internal cracks of bulk samples due to the oxygenation process [17,18] do not exist in the foams.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Parameters for Modelling of Superconducting Foams

Koblischka¹,

Koblischka-Veneva²,

Nouailhetas³

et al. 2022

Preprint

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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.

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“…The foams are less prone to cracking caused by magnetostriction [ 16 , 17 ]. The typical internal cracks of bulk samples due to the oxygenation process [ 18 , 19 ] do not exist in the foams.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Parameters for Modelling of Superconducting Foams

et al. 2022

View full text Add to dashboard Cite

Superconducting YBa2Cu3Oy (YBCO) foams were prepared using commercial open-cell, polyurethane foams as starting material to form ceramic Y2BaCuO5 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 as reported in the literature for pure polyurethane foams. The results of a first modelling attempt in this direction are presented concerning an estimation of the possible trapped fields (TFs) and are compared to experimental results at 77 K. This simple modelling revealed already useful information concerning the best suited foam structure to realize large TF values, but it also became obvious that for various other parameters like magnetostriction, mechanical strength, percolative current flow and the details of the TF distribution, a refined model of a superconducting foam sample incorporating the real sample structure must be considered. Thus, a proper description of the specific microstructure of the superconducting YBCO foams is required. To obtain a set of reliable data, YBCO foam samples were investigated using optical microscopy, scanning electron microscopy and electron backscatter diffraction (EBSD). A variety of parameters including the size and shape of the cells and windows, the length and shape of the foam struts or ligaments and the respective intersection angles were determined to better describe the real foam structure. The investigation of the foam microstructures revealed not only the differences to the original polymer foams used as base material, but also provided further insights to the infiltration growth process via the large amount of internal surface in a foam sample.

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Elimination of Oxygenation Cracking in YBCO Bulk Superconductors

Cited by 2 publications

References 11 publications

Microstructural Parameters for Modelling of Superconducting Foams

Microstructural Parameters for Modelling of Superconducting Foams

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