The HVAF (High Velocity Air Fuel) Thermal Spray Process is
basically the same as the HVOF (High Velocity Oxygen Fuel) process except
that this process uses air instead of oxygen.
The coatings produced by HVAF are similar to those produce by the HVOF process. HVAF coatings are very dense, strong and show low residual tensile stress or in some cases compressive stress, which enable very much thicker coatings to be applied than previously possible with the other processes.
Most HVAF systems are air cooled using the same air for combustion. While air is free compared to oxygen, this is slightly offset by the cost of larger air compressors required.
The very high kinetic energy of particles striking the substrate
surface do not require the particles to be fully molten to form high
quality HVAF coatings. This is certainly an advantage for the carbide
cermet type coatings and lower melting point materials and is where this process really excels.
HVAF coatings are used in applications requiring the highest density and strength not found in most other thermal spray processes. New applications, previously not suitable for thermal spray coatings are becoming viable.
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