HVOF (high-velocity oxygen coating) was discovered in the 1980s. It belongs to the thermal spraying category of coating. Fluid fuel is mixed with oxygen in a combustion chamber which is ignited. The temperature and pressure of produced gas are extremely high. A special nozzle is used to eject this gas at supersonic speed. To the high-speed gas stream, the powder is infused however not dissolved completely. The surge of hot gas and powder is guided towards the surface to be covered. The subsequent thick covering has low porosity and high bond quality, giving numerous advantages, for example, erosion obstruction.
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Following are some advantages of HVOF coating:
- It has a very high velocity and low porosity.
- It builds up a very strong bond with the object being coated.
- It has very strong adhesiveness.
- You will find great smoothness in it due to the higher velocity impact.
- It is tough and hard coating due to which it lasts longer.
- Thick porosity makes it less prone to corrosion.
- It has less residual stress and a thick coating.
Following are some materials used in HVOF coating:
- Alloys of metal such as steel, chromium, nickel and cobalt alloys
- Pure metals