When HVOF (High Velocity Oxygen Fuel) spraying fuel and oxygen are ignited. The flow of gas expands through a special nozzle and reaches a speed of more than 1,500 m/s. The coating powder is injected axially in the gas flow reaching extremely high speeds up to 800 m/s. The coatings sprayed with HVOF are characterized by a low porosity and a high bonding strength.
In the recently developed high-pressure, high-speed process (HP-HVOF, High Pressure - High Velocity Oxygen Fuel) the mixture of fuel and oxygen is additionally accelerated through a special nozzle. The gas flow reaches speeds up to 2,200 m/sec. Depending on the injection type of the coating powder, axially or radially, the powder has an extremely high speed up to 1,100m/sec. The coatings created in this way are characterized by an even lower porosity and higher bonding strength when compared with the first generation of HVOF systems. Depending on the selected fuel, the flame temperature ranges from 3,000°C to 4,000°C.
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