HVOF
HVOF (high velocity oxy-fuel) is the most requested and most versatile thermal spray solution at HTS Coatings, applying durable, tight-tolerance coatings — including hard materials like tungsten carbide — to repair and overhaul machine parts.
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 either hydrogen and oxygen or kerosene and 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 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.
Advantages
- Anti-fretting
- High wear parts
- Corrosion resistance
- Anti-galling
Common applications
- Print rollers
- Pump sleeves
- Ball valves
- Hydraulic shafts
- Machine part repair and overhaul
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 Coating Properties
| Property | Value |
|---|---|
| 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 |
Thinking about HVOF for a part?
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