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228 Boundary Road, PO Box 132
Marlboro, NJ 07746 

Phone 732-431-0992
Toll Free: 800-358-4287


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Equipment
  Hybrid Convertible HVAF-HVOF Thermal Spraying Equipment
 


Hybrid Convertible HVAF-HVOF Thermal Spraying Equipment
HVAF and HVOF have been merged into a single system HVAF/HVOF that offers the highest spray rates in the industry in either mode. The HVAF/HVOF system produces very economical, high quality coatings with easy to use, reliable equipment. The system sprays tungsten carbide coatings according to HVOF specifications with a HVAF 5X spray rate at as much as half the cost and deposits coatings in compliance with SAE AMS 2447, 2448 or proprietary standards. HVAF/HVOF coatings will meet all existing HVOF specifications. Our Convertible HVAF/HVOF system can be used in an existing HVOF or plasma spray booth and sprays superior HVAF or HVOF coatings by choice.
 

 
 
 
 
 Hybrid Convertible HVAF-HVOF Thermal Spraying Equipment
 
Hybrid Convertible HVAF-HVOF Thermal Spraying Equipment

Our Convertible HVAF / HVOF system can be used in an existing HVOF or plasma spray booth.

HVAF/HVOF equipment includes:

  • One or more spray guns
  • Control console equipped with a PLC and an industrial mobile computer
  • Powder feeder
  • Gas vaporizer
  • Optional grit feeder for HVAF grit blasting

Product  Information Download

Convertible HVAF / HVOF system
Uses Pros  Used With
High quality coatings of metallic alloys, cemented carbides and other composite powders High Spray rates. Dense, low porosity coatings at minimum thickness with very low Ra roughness. HVOF / HVAF Spray Guns
HVOF / HVAF Auxiliary Equipment

HVAF – High Velocity Air Fuel Process Description

HVAF is a process for the deposition of high-quality coatings of metals, alloys, cemented carbides and borides onto metallic surfaces.

The coating material in the form of pre-alloyed or composite powder is fed into a HVAF thermal spray system. The gun combusts compressed air and fuel gas (propane, propylene, natural gas, etc.) generating a high-velocity jet of combustion products. Being heated and accelerated in the jet, the spray powder impacts a workpiece (substrate) to form a coating.

The quality and efficiency of the systems family is due to the relatively low combustion temperature of the air-fuel mixture combined with the axial injection of the feedstock through the long combustion chamber where the low gas velocity provides sufficient time for the powder particles to gradually heat. The materials’ acceleration occurs in the nozzle that has a large diameter. The large diameter of the nozzle is needed to pass through the volume of nitrogen present in the combustion air. It also assures that the nozzle walls do not interact with the particles, allowing the use of a nozzle that is as long as is needed for feedstock acceleration, typically from 800 to over 1,000 m/s. The Ceramic Catalytic Insert is used in the combustion chamber to provide a wide range of stable combustion parameters.

Precise temperature control of the spray material near the melting point and high impact velocities are the distinguishing characteristics of the HVAF coating deposition process.

HVAF Configuration

HVAF Coating Quality
The combustion temperature in air-fuel mixtures is typically 1,000°C lower than in oxygen-fuel combustion. This lower temperature is ideal for the gradual heating of the feedstock particles of metals and cemented carbides to or slightly above the metals’ melting temperature. The initial oxygen content in the combustion gas mixture is 5-fold lower in the HVAF process compared to any HVOF process. Both factors prevent the oxidation of metals and the decomposition of carbides and their dissolution into the metal binder. These factors allow the retention of the original ductility of the powder feedstock material in the applied coating, even when the hardness of the cemented carbide coating exceeds 1600 HV300.

Hybrid convertible HVAF-HVOF thermal spraying equipment
Convertible HVOF and HVAF equipment spray tungsten carbide coatings according to HVOF specifications with a HVAF 5X spray rate and at half the cost. Hybrid high velocity thermal spray equipment deposits coatings in compliance with SAE AMS 2447, 2448 or proprietary standards. HVAF/HVOF coatings will meet all existing HVOF specifications.

The HVAF and HVOF Systems
Convertible HVOF and HVAF equipment spray tungsten carbide coatings according to HVOF specifications with a HVAF 5X spray rate and at half the cost. Hybrid high velocity thermal spray equipment deposits coatings in compliance with SAE AMS 2447, 2448 or proprietary standards. HVAF/HVOF coatings will meet all existing HVOF specifications.

There are three families of HVAF and HVOF systems:

  • Multi-purpose HVAF AK – versatile systems to spray metal, carbide and alloyed powders coatings all possible ways: outer and internal diameters, manual, on-site
  • Convertible HVOF + HVAF - systems to spray superior HVAF or HVOF coatings by choice
  • Specialized HVAF S – highly focused systems to spray particular metals in the most efficient way

Benefits:

  • Industrial IP67-rated Tablet + PLC Controller
  • Unlimited data logging - one system fits all guns
  • Variety of powder feeders and gas vaporizers
  • Custom-made systems and guns by request

Hybrid High Velocity Thermal Spraying Equipment Choice
Our Convertible HVAF / HVOF system can be used in an existing HVOF or plasma spray booth.

Convertible HVAF / HVOF system

HVAF/HVOF equipment includes:

  • One or more spray guns
  • Control console equipped with a PLC and an industrial mobile computer
  • Powder feeder
  • Gas vaporizer
  • Optional grit feeder for HVAF grit blasting

 

 
 
Plasma Powders & Systems Inc.
Thermal Spray Company
228 Boundary Road,
PO Box 132
Marlboro, NJ 07746

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Phone: 732-431-0992
Toll Free: 800-358-4287

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