Abstract
In this paper the influence of plasma spray parameters of both Vacuum Plasma Spraying (VPS) and Air Plasma Spraying (APS) processes onto Yttria Stabilized Zirconia (YSZ) coating microstructures were studied in order to establish a correlation with the ionic conductivity. Investigations of the relationships between spraying conditions and the spreading of particles were carried out thanks to a study of in-flight particle properties. The in-flight properties were determined using the DPV 2000 and the lamellae were studied by optical microscopy and 3D analyzes. Coatings were then elaborated. Coating microstructures were evaluated by Scanning Electron Microscopy (SEM) and their electrical properties by Impedance Spectroscopy (IS) in order to establish a relationship between interlamellar contacts and ionic conductivity. It has been shown that with these results, it has been possible to increase the ionic conductivity of YSZ coatings by improving their interlamellar contacts.
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