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6406 |
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Thursday, June 11, 2020, Hall G1 9:40 AM HVOF/HVAF Spraying |
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Emissions from metallic powder and high energy-based process - thermal spraying knowledge refresh |
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Geoffrey Darut* / UTBM, France Sébastien Dieu/ INERIS, France Laurent Meunier/ INERIS, France Olivier Aguerre-Chariol/ INERIS, France Fabrice Lezzier/ APS Coating, France Alexis Vignes/ INERIS, France Martin Morgeneyer/ UTC, France Olivier Le Bihan/ INERIS, France |
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High temperature processes related to metal powders lead to the production and release of metal particles. As a result, already published studies show that some questions have to be addressed considering occupational health and emission to the environment, e.g. nanoparticles emissions in thermal spray booth, worker exposure and air filtration efficiency. In addition, some efforts are needed to consider these concerns conjointly to lead to efficient and optimized remediation strategies. The CaRPE project aims to identify and characterize particles stack and diffuse emissions all along the manufacturing line of a coating in thermal spraying: from the powder receipt, coating manufacturing to exhaust system efficiency. In addition, parametric studies will support the development of remediation strategies. A first field campaign is reported here. A HVOF thermal spray hood has been considered in a partner manufacturing facility. First analyses have been conducted with size distribution measurement devices and samplers. It appears that particle emissions are dominated by a nanostructured aerosol. The initial 50 µm particle powder combined with the high temperature flame, induces an aerosol whose primary particles are 5 to 10 nm diameter. Measurements upstream and downstream the dust collector make it possible to calculate the efficiency from ~5 nm to ~2 µm:, a significant filtration (> 90%) is get. Nevertheless, the concentration measured downstream remains important and the aerosol is still nanostructured. |