Effects of temperature-dependent viscosity, the impact parameters and substrate's conditions in the alumina splats deposition on stainless-steel substrates using atmospheric plasma spraying
by Mohamed Elhoriny; Andreas Killinger; José Andrés Moreno Nicolás; Joaquín Solano Ramírez
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 18, No. 2, 2024

Abstract: Thermal spraying technology has proved to be a reliable technique for depositing reproducible functional surface coatings with predefined dimensional tolerances and properties. To optimise the selection of the manufacturing parameters, numerical simulation is increasingly applied, because it can provide useful information in a short time. Directly observing the particle impact, spreading, and solidification is very difficult owing to the extremely short process time and size scale. In the study, the values for the thermal contact resistance, contact angle, high impact velocity, high impact temperature, and different substrate initial temperatures were addressed. The slip conditions at the splat-substrate interface were also considered through the creation of separate models using either Marangoni shear stress or no-slip conditions at the interface. The results obtained have been compared with experimental data. Finally, the effect of preheating the substrate on the droplet's dynamic viscosity is shown.

Online publication date: Wed, 08-May-2024

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