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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hyvärinen, Leo
Tampere University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Microstructure and tribological properties of solid lubricant-doped CMT-WAAMed Stellite deposits
- 2023Eddy-Current Loss Model for Soft Magnetic Composite Materials Considering Particle Size Distributioncitations
- 2021Crystallographic phase formation of iron oxide particles produced from iron nitrate by liquid flame spray with a dual oxygen flowcitations
- 2016Microstructural and abrasion wear characteristics of laser-clad tool steel coatingscitations
- 2015Enhanced photoactive and photoelectrochemical properties of TiO2 sol-gel coated steel by the application of SiO2 intermediate layercitations
- 2012High temperature oxidation behaviour of MNCO2O4 coating on crofer 22 APU manufactured by a novel solution precursor plasma spray process (SPPS)citations
- 2012High surface area nanostructured tubes prepared by dissolution of ALD-coated electrospun fiberscitations
- 2011Manganese-cobalt spinel coatings for SOFC metallic interconnects manufactured by conventional plasma spraying (PS) and suspension plasma spraying (SPS)citations
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document
High temperature oxidation behaviour of MNCO2O4 coating on crofer 22 APU manufactured by a novel solution precursor plasma spray process (SPPS)
Abstract
<p>MnCo<sub>2</sub>O<sub>4</sub> spinel coatings are designed to be used on metallic interconnectors in SOFC devises to decrease oxidation rate of the metallic interconnect and to prevent the evaporation of harmful CrO<sub>3</sub> and Cr<sub>2</sub>(OH)<sub>2</sub> compounds. These Cr-compounds degrade the long-term performance of the SOFC by migrating to the triple phase barrier (TPB) of the cathode and reduce back to Cr<sub>2</sub>O<sub>3</sub>. MnCo<sub>2</sub>O<sub>4</sub> spinel coatings, used in this study, were manufactured by using a novel solution precursor plasma spray (SPPS) process and heat treated in oxidizing environment. Deionized water based solutions of Mn(NO<sub>3</sub>)<sub>3</sub>•4H<sub>3</sub>O and Co(NO<sub>3</sub>)<sub>2</sub>•6H<sub>2</sub>O were used as a feedstock material. Concentration of the metal cations in the solutions was adjusted to 3 M. Ferritic stainless grade Crofer 22 APU with the thickness of 0.5 mm and surface roughness of R<sub>a</sub> <0.5 μm was used as a substrate material. The coatings were manufactured using a Sulzer Metco A3000S plasma spray system with F4-MB plasma gun with modified solution feeding hardware. Coatings with different microstructures were sprayed using different spraying parameters, e.g. the type of plasma gases used. The as-sprayed coatings were aged at 700 °C for 500 h in oxidizing environment, in order to study the stability of the coating, the growth of the Cr-scale and the Cr-transport through the spinel coatings. The microstructural characterization for the as-sprayed and the oxidized coatings were done using a field-emission scanning electron microscopy (FESEM) with SE-mode. The quantitative analyses were executed with energy dispersive spectroscopy (EDS), and in addition X-ray diffraction (XRD) was used for qualitative studies. The coatings with various microstructures were sprayed. The densest microstructure was sprayed using Ar-He plasma gas. Also the crystallographic equivalence for MnCo<sub>2</sub>O<sub>4</sub> was achieved when Ar-He plasma was used with 40 mm spraying distance. Ageing caused the increase in structural porosity. On the interface between the coating and the interconnect, a dense spinel layer was formed which effectively prevented the Cr-transport forming approximately 500 nm thick Cr-rich sub-scale.</p>