HVOF Coating

HVOF Coating

High pressure and flows of oxygen and air craft grade fuel gas are ignited and create a high velocity stream. Powder material is injected in the high velocity stream where the material is only partially melted then propels at a high velocity to the prepared work surface. Upon impact, through kinetic energy, the material is then fully melted forming a coating. HVOF coatings are applied in compression instead of containing residual stress. This provides the best wear resistance.

Energy Source & Consumption

Oxygen & Fuel Gas, 700 to 2500 Scfh

Spraying Factors

Spray Rates5 to 15 lbs/hour
Deposit Efficiencies30% to 50%
Deposit Per Pass.0005” to .001”
Particle Velocities3500 to 3900 fps

Coating Properties

MaterialsTungsten Carbide, Chromium Carbide
Coating Finishing ProcessesGrind
Hardness Range of Materials/CoatingsRc 65-78
Typical Oxide ContentLess Than 1%
Typical Porosity LevelsLess Than 1%
Erosion Resistance RatingExcellent
Abrasive Wear Resistance RatingExcellent
Thermal Cycling & Thermal Shock CapabilitiesFair
Co-efficient of Thermal Expansion & ContractionFair to Excellent
Corrosion/Oxidation Resistance RatingGood