Técnicas de acabado de materiales
2 04 2012Thermal Spray – Combustion Processes
HVOF Spraying (Liquid Fuel)
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Liquid Fuel Technology with high acceptance in the petrochemical industry.
HVOF (high velocity oxygen fuel spraying) liquid fuel uses an oxygen-kerosene mixture. The coating material, in powdered form, is fed axially 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 gases surround and uniformly heat the powdered spray material as it exits the gun and is propelled to the workpiece surface.
Process Basics
| Heat Source | Fuel (liquid) and oxygen |
| Material | Powder (metal) |
| Flame Temperature | approx. 2800 °C |
| Particle Velocity | 400 to 800 m/s |
| Spray Performance | 70 to 200 g/min |
| Schematic Diagram |  |
Process Features
- Produces very clean, hard and dense coatings with fine, homogeneous structures
- Coatings are tenaciously bonded to the substrate
- Low to compressive coating stress allows very thick coatings
Typical Applications
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