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 at a high temperature in a pressure flame generated from the combus on 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 at the customer’s request and depending on compatibility with our system.

The main benefits of thermally sprayed tungsten carbide coating are:

• Higher density coatings mean lower porosity
• Better wear resistance because of harder coatings
• Higher bonding strength to the substrate material and improved cohesive strength within the coating itself
• Less degradation of carbide phases which results in higher coating hardness
• Improved corrosion resistance because of the lower porosity of the coating
• Lower presence of oxidation because of less in-flight exposure

Typical applications of tungsten carbide coating include:

– MTM technology ball valves and seats
– Gate valves
– Valve actuators
– Stems

Our current set-up also includes fine surface finishing capabilities for the above materials, such as surface grinders and lapping equipment.