HVOF spraying
HVOF spraying or high speed spraying provides a wear and corrosion resistant coating to many objects. The technique stands for High Velocity Oxygen Fuel, which means that with this technique a coating or top layer is sprayed at a high particle speed.
The gas stream that expands through a special nozzle (venturi effect) reaches a speed of up to 1500 m/sec. The powder injected axially into this gas stream acquires a very high velocity (up to 800 m/sec). The resulting coatings are characterized by their low porosity and high bonding strength.
Characteristics
- Fine microstructure
- Very dense and low porous layers
- High bond strength
- Very smooth to edit
- Optimal micro-hardness
- Good corrosion properties
- Excellent for applying carbide coatings
- Low oxidation degree
Applications
- Seal raceways against the running-in of the seals
- Ball valves to improve wear resistance and chemical protection
- Hydraulic piston rods in the offshore for seawater protection
- Repairs or dimensional corrections of run-in shaft journals or bearing seats
- Substrate for Thermal Barrier Coatings
- Cavitation protection at hydropower plants
- Pump housings and impellers against chemical attack
Positive features
The biggest advantages of an HVOF sprayed coating are the very low porosity and the high adhesion values. Coatings applied with the HVOF installation, are sometimes also called RAM coatings
Applicable materials (NEN-EN 1274)
Metals & Alloys Steel & Stainless Steel & Molybdenum
Chromium base Cr3C2NiCr also known as Chromium carbide
Cobalt base CoCrW also known as Stellite 1, 6 and 12
Nickel base NiCrMoNb also known as Inconel 625
Nickel base NiCrMoW also known as Hastelloy C
Nickel base NiCrBSi
Fuse alloys NiCrBSi
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