High Velocity Oxy-Fuel Thermal Coating
HVOF or High Velocity Oxy-Fuel thermal coating is a state-of-the-art coating process, where particles of harder material are accelerated in a high temperature and pressure flame generated from combustion of liquid fuel and pure oxygen. The accelerated high temperature particles are fused into the base material’s surface, creating a layer with enhanced mechanical properties.
HVOF coatings mainly provide high wear and corrosion resistance in addition to protection against galling of sliding surfaces.
Currently, we are providing coating solutions with Tungsten Carbide and Stellite 6 materials, with the capability of spraying several other types of materials upon customer’s request and compatibility of the system.
Main benefits of Thermally Sprayed Tungsten Carbide Coating are:
- Higher density coatings; lower porosity.
- Better wear resistance due to harder coatings.
- Higher bonding strength to the substrate material and improved cohesive strength within coating itself.
- Less degradation of carbide phases which results in higher coating hardness.
- Improved corrosion resistance due to the less porosity present in the coating.
- Lower presence of oxidation due to less in-flight exposure.
Typical applications of Tungsten Carbide Coating include:
- MTM technology ball valves and seats
- Gate valves
- Valve actuators
- Stems
TC Coating
| Property | Requirement |
| Coating Micro Hardness | 1050 VPN300 (Minimum) |
| Finished Apparent Porosity | < 1% |
| Bonding Strength | Not less than 10,000 lbs/in2 (68 MPa) |
| Coating Thickness | Up to 0.050” (1.25 MM) |
| Final Surface Finish | Up to 6 Ra (Micro inches) |