Flame-Sprayed Glaze Coatings: Structure and Some Properties

Many substrates do not sustain the conventional glazing process (i.e., vitreous glazing) due to the relatively high temperature required by this treatment (i.e., up to 1400 °C in some cases) to fuse glazes after their application on the surface to be covered. Thermal spraying could appear as a solution to circumvent this limitation and to avoid the thermal decomposition of the substrates. This contribution describes some structural attributes of glaze coatings manufactured by flame spraying. It also discusses the influence of the feedstock powder morphology and some of its physical properties on the coating characteristics.