G. Montavon, A. ARCONDEGUY, A. DENOIRJEAN, SPCTS - UMR CNRS 6638, Faculty of Sciences, Limoges cedex, France; B. Pateyron, A. Grimaud, University of Limoges, Limoges Cedex, France; G. GASGNIER, C. HUGUET, Imerys Tableware France, Aixe-sur-Vienne, France
Glazing can be described as the coating of a substrate by fusing various mineral substances over it. Glazes can be applied onto metallic or ceramic substrates and find hence numerous applications, from art ornamenting to protection against corrosion, thanks to their design characteristics (i.e., colors, brightness, opacity, etc.) and physical properties (i.e., low thermal conductivity, tightness, etc.). Some substrates do not sustain nevertheless the glazing conventional process (i.e., vitreous glazing) due to the relatively high temperature treatment (i.e., until 1200 °C) required to fuse the glazes after their application on the surface to cover. For this reason, developing an glaze deposition technique by thermal spraying may appear interesting as it could prevent, or at least limit, the substrate material from thermal degradation. Flame spraying was considered as the spray technique. Flame temperature was adapted by adjustment of the stoechiometry according to the glaze composition. Other operating parameters were also considered, such as the stand-off distance, the scanning step, among others. This contribution describes glaze coating structural attributes and some mechanical properties resulting from the manufacturing operating parameters (deposition efficiency, porous network, Apparent Young modulus, etc.). It discusses also the influence of the feedstock powder morphology and some of its physical properties on the coating characteristics.
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