High Velocity Oxygen (Gas) Fuel Spray

High Velocity Oxygen (Gas) Fuel Spray

For machine parts requiring high hardness in addition to corrosion and wear resistance, our gas-fueled HVOF process is the ideal solution. It produces coatings that are hard, thick, dense, and have fine, homogeneous structures.

Process description

Depending upon your requirements, propylene, propane, hydrogen, or natural gas may be used as the fuel in our High Velocity Oxygen (gas) Fuel (HVOF) thermal spray systems. As a result of the high kinetic energy transferred to the particles through both HVOF processes, the coating material generally does not need to be fully melted. Instead, the powder particles are in a molten state and flatten plastically as they impact the workpiece surface. The resulting coating has a very predictable chemistry that is homogeneous and has a fine granular structure.

Process basics

Heat source

Fuel (gas) and Oxygen


Powder (Metal)

Flame temperature

Approx. 2,800 °C

Particle velocity

400 – 800 m/s

Spray performance

40 – 150 g/min

Schematic diagram of High Velocity Oxygen Fuel (HVOF) spray with gas fuel.

Key characteristics

  • Produces coatings that are very clean, hard, and dense with fine, homogeneous structures
  • Coatings are tenaciously bonded to the substrate
  • Has low compressive stress, which results in very thick coatings

Typical applications

  • Landing gear
  • Calender rolls
  • Kaplan blades
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