Electrolyte-Supported Fuel Cell: Co-Sintering Effects of Layer Deposition on Biaxial Strength
| Autor: | Zdeněk Chlup, Filip Siska, Ivo Dlouhý, Thomas Strohbach, Alessia Masini |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
ball-on-3-balls test Fractography flexural biaxial test 02 engineering and technology Electrolyte 010402 general chemistry lcsh:Technology fractography 7. Clean energy 01 natural sciences Article Flexural strength Residual stress General Materials Science SOC Ceramic Composite material lcsh:Microscopy Porosity lcsh:QC120-168.85 lcsh:QH201-278.5 lcsh:T Layer by layer mechanical strength 021001 nanoscience & nanotechnology 0104 chemical sciences lcsh:TA1-2040 residual stresses visual_art Electrode visual_art.visual_art_medium lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 |
| Zdroj: | Materials Volume 12 Issue 2 Materials, Vol 12, Iss 2, p 306 (2019) |
| ISSN: | 1996-1944 |
| Popis: | The mechanical reliability of reversible solid oxide cell (SOC) components is critical for the development of highly efficient, durable, and commercially competitive devices. In particular, the mechanical integrity of the ceramic cell, also known as membrane electrolyte assembly (MEA), is fundamental as its failure would be detrimental to the performance of the whole SOC stack. In the present work, the mechanical robustness of an electrolyte-supported cell was determined via ball-on-3-balls flexural strength measurements. The main focus was to investigate the effect of the manufacturing process (i.e., layer by layer deposition and their co-sintering) on the final strength. To allow this investigation, the electrode layers were screen-printed one by one on the electrolyte support and thus sintered. Strength tests were performed after every layer deposition and the non-symmetrical layout was taken into account during mechanical testing. Obtained experimental data were evaluated with the help of Weibull statistical analysis. A loss of mechanical strength after every layer deposition was usually detected, with the final strength of the cell being significantly smaller than the initial strength of the uncoated electrolyte (&sigma 0 &asymp 800 MPa and &sigma 1800 MPa, respectively). Fractographic analyses helped to reveal the fracture behavior changes when individual layers were deposited. It was found that the reasons behind the weakening effect can be ascribed to the presence and redistribution of residual stresses, changes in the crack initiation site, porosity of layers, and pre-crack formation in the electrode layers. |
| Databáze: | OpenAIRE |
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