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| Hauptseite > Publikationsdatenbank > Wet powder spraying derived spinel protective coatings for solid oxide cell interconnects |
| Hauptseite > Publikationsdatenbank > Wet powder spraying derived spinel protective coatings for solid oxide cell interconnects |
| Conference Presentation (After Call) | FZJ-2023-01129 |
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2023
Please use a persistent id in citations: http://hdl.handle.net/2128/33868
Abstract: Cr diffusion and Cr2O3 scale formation are widely regarded as one major degradation issue for Cr-containing steel interconnects in solid oxide cells (SOC). Although the application of (Mn,Co)3O4 spinel by atmospheric plasma spraying (APS) has proven as an effective method to improve Cr retention, high processing costs still limit the potential of this approach. In this study, we evaluated wet powder spraying as a fast, scalable and cost-effective alternative to apply protective coatings of Mn1.0Co1.9Fe0.104 (MCF) on Crofer 22H. Deposition of homogeneous coatings have been shown to depend on a complex interplay of surface pre-treatment, slurry composition, wet powder spray process parameters and post-sintering conditions. Defect-free MCF layers with high adhesion strength have been successfully applied by gradual fine-tuning of deposition and sintering parameters. According to microstructural analysis, protective layers remained stable mechanically and chemically with improved Cr retention after thermal treatment for 1000 h at 800 °C. Overall, wet powder spraying shows great potential as a highly efficient and economically viable technique for the application of gas-tight ceramic protective layers in the micrometer range.
Keyword(s): Chemistry (2nd)
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