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High Velocity Oxygen Fuel HVOF

HVOF thermal spraying process represents an innovative method to apply metallic coatings.

This technology use the kinetic energy generated by the combustion of oxygen and kerosene. High-pressure hot gas flow, created inside a combustion chamber, is conveyed to a converging / diverging nozzle at supersonic speeds. The great energy created in this phase is used to project powder particles on to the surface to be coated. The higher the speed reached by the particles, the better the characteristics of the coating.

Materials coated through HVOF deposition system offer different coating properties based on their chemical-physical nature. Heavier powders, usually made up of carbides and metallic binders, are more suitable for use with the HVOF process. This is because high speeds and low temperatures involved do not cause neither thermal degradation of carbides nor the formation of oxides, since they do not reach their melting temperature. However, we are talking about a versatile process that allows the use of a wide range of filler materials having the most varied characteristics.

Ball valves

Pelton turbines



Gate valves

Francis turbines



HVOF coatings extend the life of metal components on which they are applied and are employed in various industrial sectors. Their use is fundamental in all those contexts in which high hardness and high adhesions are required combined with almost zero porosity. All HVOF coatings are performed using advanced computerized systems and 7-axis anthropomorphic manipulators, in order to ensure uniformity of coating thickness and repeatability through time.

Main characteristics of HVOF coatings

 Examples of applicable materials using H.V.O.F. technology

  • High hardness, tungsten carbide coatings can exceed 1400 Hv
  • Low porosity, less than 2%
  • Low oxide content, due to the not excessive temperatures involved
  • High adhesion, carbide coatings easily exceed 80 Mpa
  • Excellent resistance to wear and corrosion
  • Possibility of being ground and lapped with Ra <0.05 micron
  • Tungsten Carbide WC-Co-Cr 86-10-4
  • Tungsten Carbide WC-Co 88/12
  • Tungsten Carbide WC-Co 83/17
  • Chromium Carbide Cr3C2-NiCr 75-25
  • Stellite 6
  • Stellite 12
  • Inconel 625
  • Triballoy


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