Sprayed Nanostructured Coatings Research Articles

Influence of Reduced Graphene Oxide (rGO) on Plasma Sprayed Nanostructured Coatings

Influence of Reduced Graphene Oxide (rGO) on Plasma Sprayed Nanostructured Coatings

Influence of Reduced Graphene Oxide (Rgo) on Characteristics of Air Plasma Sprayed Nanostructured Coatings

Influence of Reduced Graphene Oxide (Rgo) on Characteristics of Air Plasma Sprayed Nanostructured Coatings

Environmental Response of Plasma Sprayed Nanostructured Coatings

Erosion corrosion and environmental chamber corrosion studies conducted on plasma sprayed samples from three different spray dried and densified nanopowders showed good resistance to corrosion. A dense, uniform and even distribution of splats and small number of microvoids and pores offered a high resistance to erosion-corrosion in sodium chloride polystyrene slurry. The coatings offer a high resistance in salt spray chamber environment.

Development and implementation of plasma sprayed nanostructured ceramic coatings

A broad overview of the science and technology leading to the development and implementation of the first plasma sprayed nanostructured coating is described in this paper. Nanostructured alumina and titania powders were blended and reconstituted to a sprayable size. Thermal spray process diagnostics, modeling and Taguchi design of experiments were used to define the optimum plasma spray conditions to produce nanostructured alumina–titania coatings. It was found that the microstructure and properties of these coatings could be related to a critical process spray parameter (CPSP), defined as the gun power divided by the primary gas flow rate. Optimum properties were determined at intermediate values of CPSP. These conditions produce limited melting of the powder and retained nanostructure in the coatings. A broad range of mechanical properties of the nanostructured alumina–titania coatings was evaluated and compared to the Metco 130 commercial baseline. It was found that the nanostructured alumina–titania coatings exhibited superior wear resistance, adhesion, toughness and spallation resistance. The technology for plasma spraying these nanostructured coatings was transferred to the US Navy and one of their approved coating suppliers. They confirmed the superior properties of the nanostructured alumina–titania coatings and qualified them for use in a number of shipboard and submarine applications.