Thermal spray coatings show a continuous development over the years, as several industry sectors put higher standards and require better and more functional coatings with advanced properties.
With thermal spraying, a metallic, ceramic or cermet coating is deposited on the surface of metallic parts with the use of a gun. Highly accelerated molten particles crash onto the substrate, deform and are solidified.
Initially, a bond coating is applied in order to achieve the optimum adhesion to the substrate, followed by the application of the final surface coating. The spray raw material is used in the form of wire or powder. Several thermal spraying processes have been developed, with the most functional-popular being flame spray, arc spray, plasma spray and HVOF (High Velocity Oxy-Fuel) spray.
METALCHROM performs i) flame spraying, in which heating of particles occurs by combustion of an oxygen-acetylene mixed gas, and ii) arc spraying, in which the heat source is an electric arc.
Thermal spray coatings are applied for the salvage of worn parts and protection against wear, corrosion and high temperature oxidation. They can be deposited at a maximum thickness of 2mm and as opposed to reconditioning by hardfacing, the base metal is not thermally affected.
The process can be carried out at the customer’s works in case of very large and heavy parts.