Development of advanced Cr2O3 coatings by thermalspraying with suspensions

Advanced coatings with improved properties have been developed by spraying water-based Cr2O3 suspensions with High Velocity Oxygen Fuel Spraying (SHVOF). In comparison to conventionally sprayed coatings, suspension sprayed coatings show denser microstructure, reduced surface roughness, improved mechanical properties and corrosion resistance, as well as better laser structuring properties. Another advantage of the S-HVOF technology is the opportunity to prepare not only thick coatings but also smooth thin ones (< 20 μm) and hence to extend the coatings market. Demonstrator-components for different applications have been coated; the results show the enormous potential of S-HVOF technique for applying water-based Cr2O3 suspensions.