Use of Different Process Gases for Manufacturing Isolating Alumina Coatings by Flame Spraying with Cords
| Autor: | Dominique Billieres, Jarkko Kiilakoski, Knuth-Michael Henkel, Julien Lejay, Melanie Meyer, Michél Hauer, Cédric Bricquet, Franz Gerstgrasser |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Compressed air chemistry.chemical_element 02 engineering and technology engineering.material flame spraying 0203 mechanical engineering Coating Electrical resistivity and conductivity Phase (matter) parasitic diseases Materials Chemistry cord feedstock atomizing gas Argon electrical resistivity measurements Metallurgy Humidity 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure alumina Surfaces Coatings and Films 020303 mechanical engineering & transports chemistry visual_art Electronic component visual_art.visual_art_medium engineering electrical insulation scanning electron microscopy (SEM) 0210 nano-technology |
| Zdroj: | Journal of Thermal Spray Technology |
| ISSN: | 1544-1016 1059-9630 |
| Popis: | Besides conventional industrial demands, thermally sprayed coatings are increasingly used for innovative products. Such an application is the additive manufacturing of electrical components in automotive engineering. In particular, heating units are currently manufactured by a combination of various spray technologies. At present, simpler spraying processes like flame spraying are investigated with regard to their suitability as a future cost-effective alternative for fabricating isolating alumina coatings. In the present study, alumina cords were flame-sprayed using compressed air and argon as atomizing gases. The results demonstrate finely dispersed microstructures and a more regular and partially even higher surface and volume resistivity compared to past investigations in the literature as well as conventionally plasma-sprayed coatings despite a significantly reduced coating thickness. The content of alpha phase is clearly higher than for plasma-sprayed coatings, regardless of the atomizing gas used. Moreover, flame-sprayed coatings using argon reveal a higher resistivity in comparison to coatings sprayed with air. While the atomizing gas is found to mainly influence the ideal stand-off distance, the phase composition is not changed severely. In addition to the phase composition and kinematics, it can finally be concluded that humidity plays a major role in the coating properties. |
| Databáze: | OpenAIRE |
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