Kermetico HVAF and HVOF thermal spray equipment

The Hand-Held Gun and Portable On Site Thermal Spray System for Manual Coating Deposition

 HVAF HVOF Portable Hand-held Spray Gun for On-Site Coating Metal Carbide

The Kermetico HVAF AK-HH High Velocity Air Fuel Portable Spray Gun Weights 2.5 kg

Our hand-held gun is a member of the Kermetico AK family, which means it is operated by the same control system as any of our robot-mounted guns. We have designed it for manual thermal spray and on-site coating deposition.

Key features:

  • Spray rate – up to 15 kg/hour (33 lbs./hour)
  • Spray powders:
    • tungsten carbide and chromium carbide 3-15 to 5-30 microns
    • metals and alloys 10-30 to 20-53 microns
  • Dual-purpose: manual or robot-mounted; the detachable handle is interchangeable to a robot mount fixture
  • Net weight: 2.5 kg
  • Axial powder injection
  • Fuel gas options: propane, propylene, natural gas, propane-butane, MAPP
  • Automatic ignition
  • Blast & spray operation saves 99% of blast media, 30-50% setup and preparation time
  • Air cooling (no need for a water chiller) makes the system portable and on-site friendly
  • High coating quality: high density, low level of oxidation, impermeable to gas and liquids


  • Remote Pendant: The Base Station holds the gun during ignition. The gun is positioned with the handle slid over the Base Station. The Base has built-in ignition transformer and push-buttons for remote control (start, stop, cool, ignition, powder start/stop). The Base Station is cable-connected to the Controller.
  • Air inlet to the gun makes the second Handle. It has a Handle Assembly with two push buttons: stop the gun, and start/stop the powder feeder. This Assembly connects to the Base Station.

Light-Weight High Velocity Thermal Spray Equipment for a Manual Coating Application

Our customers report that the AK-HH system fits on-site thermal spray coating service better than any high velocity thermal spray system on the market.

Existing HVOF hand-held systems are either water-cooled (which substantially limits mobility) or air cooled which provides poor coating quality due to a requirement to use a short nozzle that limits particle acceleration.  Air cooling is insufficient for the use of a long nozzle in high temperature HVOF.

The manual AK-HH gun sprays 3 times more carbide or metal per minute than its HVOF rivals.

It has better deposition efficiency than HVOF rivals with the majority of coating materials.

High technological efficiency forgives distance and angle change, allowing on-site manual deposition of quality coatings.

It uses cooling air for combustion, which increases its power efficiency.

Just 80 kW power means low thrust, which allows a worker to manipulate this 2.5 kg gun easily with relaxed requirements for the gun traverse speed.

Safety of On-site Coating

The Manual Application of a Metal Coating onto a Mandrel with Kermetico HVAF AK-HH

The Manual Application of a Metal Coating with Kermetico HVAF AK-HH

You might be wondering, how safe is it to spray metals and alloys manually?

It depends on the equipment.

The HVOF combustion temperature is usually higher than the boiling point of a feedstock material, which can result in possible hazardous metal evaporation. It is especially dangerous during on-site operation.

The Kermetico HVAF AK-HH combustion temperature is near the melting point for most materials used, which preheats metals and carbides but does not evaporate them. It prevents oxidation and decomposition of the feedstock material and also keeps the air clean.

The On Site Thermal Spray Coating Quality

The portable Kermetico HVAF AK-HH system is used to deposit tungsten carbide, chrome carbide, stainless steel, Hastelloy-type and Ni-based coatings onto complex surfaces of various parts and structures.

It is a heavy-duty manual coating system, made to endure harsh environments and to work long hours with high spray rates. Unlike other thermal spray processes like plasma spray, arc spray and flame spray, it deposits low oxidized, gas tigth coatings with 80 MPa+ adhesion.

A Typical Cross-Sectional Micrograph of a Kermetico HVAF AK-HH Coating

The micrograph of NiCrBSi 20-53 powder deposited with Kermetico HVAF AK-HH

A Micrograph of a NiCrBSi Coating Deposited with the Kermetico HVAF AK-HH Using 20-53 Microns Powder

Thermal Spray Applications for Our HVAF Hand-Held Gun

We have designed our AK-HH gun to spray on-site and in-house:

Find more applications here.

Blasting and Spraying with the Kermetico Guns On-Site

Each Kermetico AK-family gun can provide blasting and spraying operations. Prepare a part for coating, blast it with AK gun (it is extremely fast and uniform) change the powder feed hose and spray with the same gun, spending 10x less time for the blasting operation than traditional sandblasting.

It is much faster and more accurate than manual blasting.

Do you want to know the best part?

Using HVAF blasting for surface preparation reduces blast media consumption by 100-times compared to blasting with compressed air.

Imagine how important this is for on-site operation.

The Advantages of the Kermetico HVAF Process

The manual AK-HH HVAF equipment sprays powders, heated and accele­rated by the combustion products of the air-fuel gas mixture.

When entering the gun, the compressed air cools the gun. Then the preheated air is used for mixing with the fuel gas for combustion.

The mixture of pre-heated compressed air and fuel gas flows into the combustion chamber through the orifices of a catalytic ceramic insert.

The initial spark plug ignition of the mixture results in the heating of the insert above the mixture’s auto-ignition temperature than the hot insert then continuously ignites the mixture.

The spray powder is injected axially into a wide combustion chamber, where the gas flow is very slow, less than 40 m/s (130 ft./sec.)

The long residence time and exposure to favorable heat transfer conditions at high gas pressure, allows the powder to heat efficiently in the chamber.

As an optional tool for a proper heating, one may inject controlled amounts of a high heat conductivity gas (hydro­gen, helium).

The powder leaving the chamber is propelled into the nozzle of chosen length and configuration, where it is accelerated to a velocity that may be from 800 m/s to over 1000 m/s (2,600-3,300+ ft./sec.), dependent on the chosen nozzle and combustion chamber pressure.

When impacting a sub­strate, the spray powder particles form a surface coating.

The Characteristics of the Hand-Held Thermal Spray System

##Specified CharacteristicS.I. UnitsU.S. Units
1Total heat output80 kW272,970 BTU/h
2Feedstock particle size range, microns

  • Carbides
  • Metals and alloys

3-15 to 5-30

10-30 to 20-53

3Maximum spray rate15 kg/hour33 lbs./hour
4Fuel gasPropane, propylene, natural gas, propane-butane, MAPP
5Consumption of compressed air5,240 SLPM                         185 SCFM
6Maximum inlet air pressure7.4 Bar105 PSIG
7Consumption of fuel gas, propane65 SLPM2.3 SCFM
8Maximum inlet fuel pressure7.4 Bar105 PSI
9Consumption of powder carrier gas, N2max 20 SLPMmax 0.7 SCFM
10Gun dimensions178 (254)x 80×80 mm7(10) x 3.1×3.1 inch
11Gun weight with handle2.5kg5.5 lbs.
12Average thrust during gun operation3.6 kg7.9 lbs.

Kermetico, Inc. – HVAF and HVOF Equipment Design and Manufacture Since 2006

We make different spray guns for different applications. Please check the full spectrum of our equipment here.

Our HVOF & HVAF systems operate each of our guns or several guns at once (by request).

We proudly design and produce our HVAF and HVOF thermal spray equipment in California, USA, and install it all over the world.

You can visit our R&D center in Benicia to meet our designers and see our HVOF and HVAF equipment in action.

The Hand-Held Gun and Portable On Site Thermal Spray System for Manual Coating Deposition
4.9 (98.18%) 11 votes

Print page
The Hand-Held Gun and Portable On Site Thermal Spray System for Manual Coating Deposition