PROCESS DESCRIPTION:

The HVOF (High Velocity Oxy-Fuel) process produces low porosity, dense thermal sprayed coatings that exhibit high bond strengths, some exceeding 12,000 PSI. It also produces low oxides and extremely fine as-sprayed finishes. Industrial HVOF coatings have low residual internal stress and can be sprayed to a thickness not normally associated with dense, thermal sprayed coatings.

HVOF, an oxygen-fuel mixture, is fed into a combustion chamber and ignited. The expanding gases flow through a nozzle from the combustion chamber. The powder is continuously fed into the combustion chamber and exits through the nozzle as a thermal spray coating onto the substrate at velocities up to 3200 feet per second.

HVOF coatings can survive harsh service conditions other industrial coatings can not, particularly in wear and many corrosion applications, greatly increasing component service life. The as-sprayed, smooth surface, low porosity and uniform chemistry of HVOF coating can be finished to very smooth surface profiles.

HVOF coatings are a common choice for dimensional restoration repair and corrosion control coatings. Many OEMs thermal spray their new components to extend the service life. Different carbide and superalloy coatings are the primary industrial coatings applied with HVOF thermal spraying.