For High Velocity Oxygen (liquid) Fuel (HVOF) spraying, we use an oxygen-kerosene mixture. We axially feed the coating material, in powdered form, through the gun, generally using nitrogen as a carrier gas. The fuel is thoroughly mixed with oxygen within the gun and the mixture is then ejected from a nozzle and ignited outside the gun. The ignited gasses surround and uniformly heat the powdered spray material as it exits the gun and is propelled onto the workpiece surface.
|Fuel (liquid) and Oxygen
|Approx. 2,800 °C
|400 – 800 m/s
|70 – 200 g/min
Schematic diagram of High Velocity Oxygen Fuel (HVOF) spray with liquid fuel.