High-Velocity Oxy-Fuel Spray
The Principle of HVOF Spray
In the HVOF process, the powder is introduced axially into the chamber, where high-pressure gas is continuously burned. The exhaust gas is discharged through an expansion nozzle, which generates a high-speed air flow. The powder particles are heated in the air flow and transferred to the surface of the workpiece to form a dense coating with excellent bonding properties.
Due to the moderate transfer of heat to the powder particles and keeping the workpiece relatively cold, the metallurgical changes of the sprayed material and the workpiece are small.