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3872 |
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Wednesday, May 21, 2014, Hall A 11:10 AM Plasma Spraying 1 |
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Tailoring the spray conditions for solution and suspension plasma spraying |
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Armelle Vardelle / University of Limoges-CNRS, France William Duarte* / Centre National dEtudes Spatiales, France Aurélien Joulia/ Centre National dEtudes Spatiales, France Simon Goutier/ University of Limoges CNRS, France Sylvie Rossignol/ Ecole Nationale Supérieure de Céramique Industrielle , France |
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The plasma spray process using suspensions and solutions as liquid feedstock allows the deposition of finelystructured coatings with improved properties compared to that of coatings deposited by the conventional plasma spray techniques. However, the evaporation of the solvent, synthesis of the material in the case of solution, acceleration, heating and melting of the fine solid particles within the plasma jet take place in a shorter time as the substrate is located closer to the plasma torch and globally require more energy. Saving resources and energy efficiency are becoming significant issues both for production and environmental protection. In this paper, we will use a large range of plasma spray conditions to achieve metal oxide coatings both by suspension and solution spraying and correlate them to the coating microstructure. The operating conditions making it possible to get regular splats onto the substrate and achieve homogeneous coatings will be discussed regarding the plasma jet stability and velocity and the used enthalpy. |