Microstructural Parameters for Modelling of Superconducting Foams
Superconducting YBa<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>Cu<inline-formula>...
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MDPI AG
2022-03-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/6/2303 |
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| author | Michael Rudolf Koblischka Anjela Koblischka-Veneva Quentin Nouailhetas Ghazi Hajiri Kévin Berger Bruno Douine Denis Gokhfeld |
| author_facet | Michael Rudolf Koblischka Anjela Koblischka-Veneva Quentin Nouailhetas Ghazi Hajiri Kévin Berger Bruno Douine Denis Gokhfeld |
| author_sort | Michael Rudolf Koblischka |
| collection | DOAJ |
| description | Superconducting YBa<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula>O<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mi>y</mi></msub></semantics></math></inline-formula> (YBCO) foams were prepared using commercial open-cell, polyurethane foams as starting material to form ceramic Y<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>BaCuO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>5</mn></msub></semantics></math></inline-formula> 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. |
| first_indexed | 2024-03-09T13:27:49Z |
| format | Article |
| id | doaj.art-ffa572da4f4e4fe382fc3a4f4db78aad |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T13:27:49Z |
| publishDate | 2022-03-01 |
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| record_format | Article |
| series | Materials |
| spelling | doaj.art-ffa572da4f4e4fe382fc3a4f4db78aad2023-11-30T21:22:31ZengMDPI AGMaterials1996-19442022-03-01156230310.3390/ma15062303Microstructural Parameters for Modelling of Superconducting FoamsMichael Rudolf Koblischka0Anjela Koblischka-Veneva1Quentin Nouailhetas2Ghazi Hajiri3Kévin Berger4Bruno Douine5Denis Gokhfeld6Experimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbrücken, GermanyExperimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbrücken, GermanyExperimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbrücken, GermanyGREEN, Université de Lorraine, F-54000 Nancy, FranceGREEN, Université de Lorraine, F-54000 Nancy, FranceGREEN, Université de Lorraine, F-54000 Nancy, FranceKirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, RussiaSuperconducting YBa<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula>O<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mi>y</mi></msub></semantics></math></inline-formula> (YBCO) foams were prepared using commercial open-cell, polyurethane foams as starting material to form ceramic Y<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>BaCuO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>5</mn></msub></semantics></math></inline-formula> 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.https://www.mdpi.com/1996-1944/15/6/2303superconducting foamsYBCOmicrostructuremodelling parametersfoam cellscurrent flow |
| spellingShingle | Michael Rudolf Koblischka Anjela Koblischka-Veneva Quentin Nouailhetas Ghazi Hajiri Kévin Berger Bruno Douine Denis Gokhfeld Microstructural Parameters for Modelling of Superconducting Foams Materials superconducting foams YBCO microstructure modelling parameters foam cells current flow |
| title | Microstructural Parameters for Modelling of Superconducting Foams |
| title_full | Microstructural Parameters for Modelling of Superconducting Foams |
| title_fullStr | Microstructural Parameters for Modelling of Superconducting Foams |
| title_full_unstemmed | Microstructural Parameters for Modelling of Superconducting Foams |
| title_short | Microstructural Parameters for Modelling of Superconducting Foams |
| title_sort | microstructural parameters for modelling of superconducting foams |
| topic | superconducting foams YBCO microstructure modelling parameters foam cells current flow |
| url | https://www.mdpi.com/1996-1944/15/6/2303 |
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