HVOF (High Velocity Oxy Fuel) Coating

The HVOF (High Velocity Oxy Fuel) process consists of an internal combustion process that generates a supersonic jet for heating and accelerating the powders towards the part to be coated; once the substrate is impacted, the dust particles solidify quickly, giving rise, thanks to the high kinetic energy possessed, to lamellar structures.

The HVOF process allows, at sustainable costs, to improve the surface characteristics of a material and to extend its life, even in particularly corrosive and wearing work environments. Generally this result can be obtained without interfering with the mechanical and structural characteristics of the substrate and therefore without the need for further treatments.

The HVOF process allows you to deposit high-density coatings, characterized by high hardness, high adhesion to the substrate and a better surface finish than other thermal spraying processes. The thicknesses of the HVOF coatings vary from 50 to 500 µm. The surface finish in the “raw” state is generally higher than 2.5 µm (Ra). The coatings can be used in the “raw” state or subjected to grinding and lapping to meet customer needs.

HVOF coatings with pure chromium or chromium carbides can be used as an alternative to hard chromium plating to provide protection from wear and corrosion.

Advantages

  • High wear resistance thanks to the greater hardness and compactness of the coating
  • High hardness due to the lower degradation of the carbides
  • High resistance to corrosion due to the lower porosity
  • High density (low porosity) of the coating due to the impact speed of the particles
  • High adhesion of the coatings to the underlying material and high internal cohesion of the coating
  • Reduced oxide content due to shorter exposure time in flight
  • Better finish of the “raw” coating due to the high impact speeds and reduced particle size of the powder
  • Alternative process to chrome plating

Applications

Aerospace

  • Jet engine components
  • Components and implementation systems

Energy (gas turbines)

  • Combustion chambers
  • Nozzles
  • Injectors
  • Burners
  • Liner and Cap Liner
  • Transition pieces
  • Cooling pipes
  • Sectors of stator rings

Materials

  • Alloy steels
  • Stainless steels (austenitic and martensitic)
  • Nickel / Cobalt based super alloys
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