High velocity oxygen fuel spraying (HVOF) is the further development of the flame spraying method for the production of extremely dense and highly adhesive metallic and carbide coatings.
A fuel gas/oxygen mixture is combusted under high pressure in the combustion chamber and then accelerated to supersonic velocity in a de Laval nozzle. The process temperature reaches up to 3.160 degree Celsius.
The powdery coating material is melted by the combustion gas jet and accelerated to velocities in excess of 600 m/sec.
Typical coating thicknesses vary from 0.1 to 0.5 millimetres.
Gas-fired systems also enable ceramic materials to be sprayed.
Fields of application::
- Wear protection
- Corrosion protection