FAQ´s
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HVOF - High Velocity Oxy-Fuel

thick coatings

THERMAL PROJECTION

The process is based on continuous oxygen combustion of a fuel. Combustion gases entering a chamber , where the raw material in powder form injected axially through the flow stream of an inert gas , usually nitrogen.
The high gas pressures associated with geometries designed specifically to promote the acceleration of the same , allowing the coating material get speeds of the order of 300 m / s with a gas velocity of 2140m / s.

This process is especially designed for the application of high quality anti-wear coating , which is characterized by high hardness (approximately 1.200HV ) , low porosity (0.5-1% ) and high adhesion to the substrate (> 80 MPa) . Typical thicknesses of these applications varies between 50 and 400μm .
CERMETS:

WC/Co; WC/Co-Cr; WC/Ni; WC/NiCr; WC/NiCrBSiFe; Cr2C3/NiCr.

  • Raw material form : powder .
  • Typical flow of raw material : 2.5 to 3.0 kg / h.
  • Typical gas velocity : 2000 m / s.
  • Typical particle velocity : 300 m / s.
  • Power source: combustion of propane with oxygen or hydrogen.
  • Temperature energy source : 3000 º C.
  • Typical adhesion voltages > 80 MPa .
  • Typical porosity : 0.5 to 1% .
  • Typical thickness of coating : 100-500 micrometers.
OBJECTIVES

Adapt and improve surfaces for applications that will be submitted , giving them characteristics:

  • Resistance to wear (abrasion , erosion and friction) ;
  • Resistance to corrosion and oxidation ;
  • Conductivity or electrical insulation, thermal or magnetic ; optics ;
  • Biocompatibility.
CUSTOMER BENEFITS
  • Increased longevity of the components;
  • Cost reduction ;
  • Reduced downtime / maintenance ;
  • Increased overall productivity ;
  • Better product quality.

 

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