The spray material in powder form is fed continually into a fuel gas-oxygen flame where it is typically melted by the heat of combustion. A powder feed carrier gas transports the powder particles into the combustion flame, and the mixed gases transport the material towards the prepared workpiece surface. It rapidly solidifies to form the coating. A cap that feeds compressed air surrounds and appropriately shapes the flame.

Process Basics

Heat Source	Fuel gas and oxygen
Material	Powder (metals, ceramics)
Flame Temperature	max. 3100 °C
Particle Velocity	up to 50 m/s
Spray Performance	35 to 150 g/min
Schematic Diagram

Process Features

• Excellent for basic wear and corrosion resistance
• Coatings can be machined to final dimensions and finish

Typical Applications

Crank shaft	Sucker rod couplings