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Development of Thermal Spray Alumina Coating for High Diffuse Reflectivity Application in Lambertian Screen

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Abstract

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), spraying parameters and powder-based 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 obtain a high diffuse reflectivity, important parameters are a porosity of 7–9%, the presence of a nanostructured microstructure, a mean gray level with isotropic or laser lighting as high as possible to preserve powder white color.

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Acknowledgments

ICB is supported by the EUR-EIPHI Graduate School (Grant No. 17-EURE-0002). This study was also supported by MBDA France.

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  1. UTBM, CNRS, ICB, 90010, Belfort Cedex, France

    Geoffrey Darut & Christophe Verdy

  2. ALPhANOV, Institut d’optique d’Aquitaine, 33400, Talence, France

    Matthieu Pommies & Charly Regnault

  3. MBDA France, 92350, Le Plessis-Robinson, France

    Thomas Lafargue-Tallet, Maximilian Taillandier & Raymond Peiffer

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  1. Geoffrey Darut
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Darut, G., Verdy, C., Pommies, M. et al. Development of Thermal Spray Alumina Coating for High Diffuse Reflectivity Application in Lambertian Screen. J Therm Spray Tech 32, 2778–2801 (2023). https://doi.org/10.1007/s11666-023-01660-9

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