Spraying with supersonic speed
HVOF: high velocity oxy fuel spraying.
The HVOF spraying is one of the newer methods. A unique feature is the gas jet exiting with supersonic. The impact velocity of the particles on the surface is much higher than using other methods. The temperature input during spraying is moderate. Thus, the spraying material is changed only slightly metallurgical, so that there is minimal formation of mixed carbides. As fuel gases propane, propene, ethylene, acetylene and hydrogen can be used.
As fuel gases propane, propene, ethylene, acetylene and hydrogen can be used.
Areas / benefits
- Very dense coatings with excellent adhesion properties
- Very thin coatings with high dimensional accuracy
- Applications are: Sliding surfaces, rollers for the photographic industry, parts for petrochemical and chemical machines (such as pumps, ball valves, mechanical seals)
Cermets (tungsten carbide-containing powder), nickel and cobalt alloys, high-alloy steels, copper alloys, aluminum alloys, molybdenum, oxides
For more information, see materials.
Spare Parts, components
Powder injectors, powder tubes, air caps