With HVAF (high-velocity flame spraying with compressed air), the fuel gas and compressed air are supplied to the gun body in the so-called combustion chamber. There it is ignited so that the flame then produces the fuel gas-air mixture at approx. 1800°C. This creates such a high flame speed that the very high-quality spray additives (spray powder), which are additionally supplied axially with nitrogen as a carrier gas, reach approx. 800-1200m/sec. be accelerated.

HVAF (A stands for Air) uses the same spray powders as HVOF (O stands for Oxygen).

A high proportion of carbide tungsten carbide or chromium carbide powders in very different compositions are used and reflect the variety of possibilities. The most frequently requested layer thicknesses are between 50-300µm.

But there are also options beyond that.

Propane is usually used as a fuel gas and the pressure is provided by compressors.

The areas of application are diverse and include: Mechanical engineering, printing and paper industry, shipbuilding, mixed technology, sealing systems, wire industry...

High velocity flame spraying (HVAF)
(1) combustion gas/air
(2) powder + carrier gas
(3) Burner nozzle with air cooling
(4) Fuel gas/air mixture flame and spray particles
(5) Workpiece/substrat