In industries where equipment experiences constant abrasion, surface wear can quickly degrade the lifespan of critical components. At Manluk, we’re proud to provide our customers with valuable solutions to help solve the challenges posed by increased exposure to abrasion, including reliable protection methods like High Velocity Oxy-Fuel (HVOF) coatings. As a highly durable thermal spray, HVOF creates a hard surface layer that does not compromise the base material, providing superior protection and minimal distortion.Learn more below!
What is HVOF Coating
HVOF is a hard-facing process that uses a high-velocity gas stream to apply a thin, dense layer of tungsten carbide onto the component. Unlike weld overlays, the coating does not fuse directly with the steel, but bonds with the surface instead.
How it works:
- A fuel gas and oxygen mixture is ignited to create a high-velocity jet.
- Tungsten carbide powder is fed into the jet.
- The particles accelerate toward the surface at extremely high speeds.
- The coating mechanically bonds to the steel, forming a dense and uniform layer.
The result is a very thin, extremely hard surface that protects the part from abrasive wear while maintaining excellent dimensional accuracy.
What Gives HVOF Coatings Their Strength
The strength of HVOF comes from two main factors:
1. High particle velocity
The carbide particles strike the surface at supersonic speeds, compacting tightly and forming a dense coating.
2. Low heat input
The relatively low heat used in HVOF reduces porosity and prevents distortion, allowing the base material to stay stable and form a clean, stable coating.
Best For Low Impact
While HVOF coatings offer exceptional hardness and wear resistance, it’s essential to note that they’re not designed for high-impact scenarios. Because the coating forms a mechanical bond, it does not absorb shock or heavy loading the same way welded layers can.
HVOF is best suited for:
- Low-impact environments
- Sliding wear
- Rotating surfaces
- Tight-tolerance precision components
- Areas where distortion must be avoided
When impact is expected, a welded tungsten carbide overlay is usually the better choice.
Where HVOF Coatings Provide the Most Value
HVOF coatings are ideal for components that need a thin, extremely hard layer without changing their geometry. Common applications include:
- Gate valve Seats
- Gate Valve Gates
- Pump sleeves
- Shafts and spindle surfaces
- Valve stems
- Rotating equipment
- Wear rings
- Precision-fit components
- Surfaces that must remain straight and true
Properly applied HVOF coatings help reduce:
- Scoring and gouging
- Sliding wear
- Abrasive erosion
- Surface fatigue
- Galling
- Premature failure from steady, abrasive contact, and more.
Built for Precision Wear Protection
At Manluk, we recommend HVOF when our clients need a highly durable surface layer that doesn’t distort the base material. HVOF coatings are a powerful tool, and when applied correctly, they deliver long-lasting performance in demanding industrial settings. For the right application, they provide some of the best wear protection available.
Contact us today to learn more.