HVAF Coating are better quality:

Low temperature
HVAF air-fuel combustion temperature is typically 1000°C lower than in HVOF oxygen-fuel combustion. This lower HVAF temperature is ideal for the gradual heating of the powder to or slightly above the metals’ melting temperature.

Low oxygen

The oxygen content in the HVAF combustion gas mixture is 80% lower compared to any HVOF process.

Ductile Coatings

Low Oxygen and lower temperatures prevent the oxidation of metals and the decomposition of carbides and their dissolution into the metal binder. HVAF process retains the original ductility of the powder feedstock material in the final coating.  The ductility is kept even when the hardness of the tungsten carbide coating exceeds 1700 HV300.

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HVAF Kermetico

HVAF – High Velocity Air Fuel process description

HVAF Process Inputs

  • Compressed Air
  • Fuel (propane, propylene, natural gas, etc.)

Carbide or Metal Powder is fed into a Kermetico HVAF thermal spray system. The gun combusts the compressed air and fuel gas generating a high-velocity jet of gases. The powder is heated and accelerated in the jet and, when impacting a work-piece (substrate), forms a coating.

Kermetico HVAF systems produce coatings high quality and efficiency  is a result of

  1. Low combustion temperature of the air-fuel mixture
  2. Axial injection of the feedstock through the long combustion chamber.  In this long combustion chamber the controlled gas velocity provides sufficient time for the powder particles correct heating.

Powder acceleration occurs in the large diameter nozzle. The large diameter of the nozzle assures that the nozzle walls do not contact powder.  No contact reduces the nozzle wear dramatically.  That means that Kermetico can design a nozzle that is as long as needed for powder acceleration to over 1,200 meters per second.

HVAF Process Benefits
WC/Co/Cr Coating Feature
Typical HVOF
Gun Economy setup

Gun Balanced setup

Gun Ultra-quality setup
Deposit efficiency, %
40-55%              60-7048-5836-42
Hardness, HV300
1050-1250 HV300
Apparent metallographic porosity<0.8 percent
<0.8 percent<0.5 percent<0.1 percent
Bond strength (@0.040” thickness), PSI
+12,000 PSI
Range of as-sprayed roughness, µm 3.5-4.5 micron
Maximum coating thickness, mm 
12.7 mm12.7 mm3 mm1.5 mm

 Kermetico HVAF Benefits to you

The Kermetico AK HVAF system deposits coatings with

  1. 5-6 times higher spray rate,
  2. 20-30% higher deposition efficiency,
  3. 30% less deviation than any HVOF system.

This gives you at least a 50% lower cost compared to your HVOF competitors

HVAF has better coating quality