HVOF Spray

hvof spray

What is HVOF Spray? 

HVOF stands for high velocity oxy-fuel and is the most requested thermal spray solution at HTS Coatings. Frequently used to machine part repair or overhaul, it offers durable and long-lasting surface coatings. HVOF is applied robotically as thin as three hundredths of an inch. It can easily achieve OEM (original equipment manufacturer) dimensions or tight tolerance requirements. HVOF offers harder coating materials, such as tungsten carbide, and can spray many different metal-based materials.

HVOF spray is the combustion of oxygen or kerosene combined with oxygen to produce a high velocity spray jet. Coating material is injected into the spray jet via argon gas and applied to the component surface. The HVOF spray jet performs at such a high velocity that it produces diamond shockwaves. These shockwaves provide a built in quality check during the spray process.

hvof spray gun diagram

HVOF Spray Solutions

HVOF is our most versatile spray solution. Almost any part is a good candidate for HVOF, so it is up to the customer to determine if the additional corrosion and wear protection is required over flame, arc or plasma spray. HVOF excels at thinner coatings and meeting tight machine tolerances. Some of the common parts sprayed via HVOF at HTS Coatings are print rollers, pump sleeves, ball valves and even some hydraulic shafts.

extruder screw repair before and after

Common Coating Solutions:

  • Tungsten Carbide
  • Chrome plating alternative
  • Premium Coating

Common Coating Materials:

  • Tungsten Carbide
  • Chrome Carbide
  • Stellite
  • Stainless Steel
  • Hastelloy
  • Inconel
  • Monel

HVOF Spray is great for...

  • Anti-fretting
  • High wear parts
  • Corrosion resistance
  • Anti-galling

HVOF Spray Coating Properties

 Operating Cost

Premium

Bond Mechanism

Mechanical (>10,000 psi)

Max Flame Temperature

5,600° F

Particle Velocity

2,000-3,000 ft/sec

Max Spray Rate

30 lbs/hr

Coating Thickness Range

0.003" to 0.030"

Special Features

Capable of high corrosion and wear resistant coatings, no heat distortion

Wear Resistance

Excellent

Corrosion Resistance

Very Good

Porosity

Very Low


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