Erosion of ceramic coating applications under the influence of APS and HVOF methods

Abstract

The erosion wear of the thermal barrier coating (TBC) application created by the ceramic topcoat effect on the substrate material and the high-temperature resistance has been researched in the study. Solid particle erosion effect has an important role in high-temperature applications such as energy conversion plants, gas turbines, and jet engine blades. In these applications where the ambient temperature varies and high-temperature effect is important, the deformation resistance is an important criterion in TBC’s produced with atmospheric plasma spray (APS) and high-velocity oxy fuel (HVOF) methods as a result of the angular impact of the particles at certain velocities. In addition, its presence has an important impact in the adhesion effect between the substrate material and the ceramic top coating. In line with all these related criteria, the results of erosion wear in which the significance of the studies is gradually increasing will contribute to the fatigue failure of these coatings. To perform solid particle erosion experiments under high-temperature conditions (300 °C air temperature), experimental parameters were determined as three different erosive particle impact angles (30°, 60° and 90°) and fixed particle impact velocity (~ 50 m/s) with using constant particle size (200 µm Al2O3). As a result of the experiments, the erosion rates under the effect of temperature were determined depending on the angular and velocity variations of different coating methods. In the interpretation of the results, comments were made on the erosion rate variability using the effects of porosity, hardness, and surface roughness.