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Article Dans Une Revue Journal of Thermal Spray Technology Année : 2023

Development of thermal spray alumina coating for high diffuse reflectivity application in Lambertian screen

Résumé

This study is about material and processes technologies for the realization of diffuse reflective screens supporting high temperatures. The use of high-energy lasers leads to material issues for high temperature diffuse reflective screen applications. Solutions exist for temperatures below 350°C. In this context other technological solutions need to be investigated to produce high temperature resistant screens. Diffuse reflectivity is studied for different alumina coatings obtained by thermal spraying. Plasma and flame processes and different powders (size, microstructure) are selected. The aim is to create various coating microstructures (pore size, porous architecture, nano area) and analyze the influence on diffuse reflectivity. Depending on thermal spray processes (APS, flame, Master Jet), spraying parameters and precursor material (fine powder, nano-agglomerated, flexicord), diffuse reflective values range from 74 to 92%. Best results are obtained by combining the plasma spray process and a nano agglomerated powder. However, a dense coating (porosity lower than 2%) or a too porous one (especially with connected pore columns) are less efficient. To
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Dates et versions

hal-04320477 , version 1 (04-12-2023)

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Geoffrey Darut, Christophe Verdy, Matthieu Pommies, Charly Regnault, Thomas Lafargue-Tallet, et al.. Development of thermal spray alumina coating for high diffuse reflectivity application in Lambertian screen. Journal of Thermal Spray Technology, 2023, 32 (8), pp.2778-2801. ⟨10.1007/s11666-023-01660-9⟩. ⟨hal-04320477⟩
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