HVAF Spray

hvaf spray

What is HVAF Spray?

HVAF is short for high velocity air fuel. It is closely related to HVOF spray but improves upon its methods. HVAF produces stronger, more uniform coatings. The flame temperature of HVAF is closer to the melting point of most coatings materials, eliminating breakdown due to particle overheating. This also means that HVAF produces the most uniform mechanical coating of the types available at HTS Coatings. All of these advantages make HVAF coatings the most abrasion, wear and corrosion resistant. This low spray temperature also makes HVAF the most ductile coating; aiding in cavitation damage protection.

HVAF coating technology is the combustion of propane in a compressed air stream. Like HVOF, this produces a uniform high velocity jet. HVAF differs by including a heat baffle to further stabilize the thermal spray mechanisms. Material is injected into the air-fuel stream and coating particles are propelled toward the part. HVAF offers faster coatings at a lower spray temperature while increasing wear and corrosion resistance.

HVAF spray gun diagram

HVAF Spray Solutions

The ductility of HVAF coatings makes it the only coating capable of preventing cavitation damage. This also allows for thicker coating build up without the worry of cracking. HVAF has an as-sprayed roughness of approximately 40 Ra and can be polished down to less than 1 Ra. This system also offers inner diameter spraying. HVAF coatings can also be used as an environmentally friendly alternative to hard chrome plating. HVAF can be sprayed on most anything but has added benefits for pump impellers, pump housings and hydraulic rods.

grinder mandrel repair

Common Coating Solutions:

  • Tungsten Carbide
  • Chrome plating alternative
  • Premium Coating

Common Coating Materials:

  • Tungsten Carbide
  • Chrome Carbide
  • Stainless Steel
  • Hastelloy
  • Inconel

HVAF Spray is great for...

  • Cavitation damage resistance
  • High wear parts
  • Corrosion resistance
  • Parts that require smooth surfaces and tight tolerances

HVAF Spray Coating Properties

 Operating Cost


Bond Mechanism

Mechanical (>12,000 psi)

Max Flame Temperature

3,560 to 3,650° F

Particle Velocity

3,300 ft/sec

Max Spray Rate

73 lbs/hr

Coating Thickness Range

0.002" to 0.050+"

Special Features

Capable of high corrosion and wear resistant coatings, no heat distortion, ductile coatings

Wear Resistance


Corrosion Resistance



Very Low

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Thermal Spray
HVOF Spray