Liquid-Fuel HVOF Coating
The Hardest Industrial Coating We Offer
Dense tungsten carbide and metallic coatings applied at supersonic velocity.
Built for components that cannot afford to fail.
WHAT IS LIQUID-FUEL HVOF?
High-Velocity Oxygen Fuel (HVOF) coating is a thermal spray process that uses the combustion of liquid fuel and oxygen to generate an extremely high-pressure supersonic flame.
Coating powder is introduced into this flame and accelerated to particle velocities exceeding 1,000 metres per second , several times the speed of sound. At that velocity, particles impact the component surface in a semi-molten plastic state, flattening and interlocking to form an exceptionally dense, tightly packed microstructure.
The result is a coating with porosity below 1%, high compressive residual stress, and bond strength exceeding 70 MPa , performance that hard chrome plating and conventional thermal spray processes cannot match.
Liquid-fuel HVOF operates at higher combustion pressures and flame temperatures than gas-fuelled systems, producing coatings that are denser, harder, and more uniform , with spray rates up to twice that of gaseous alternatives.
Why Choose HVOF?
Denser Than Chrome
HVOF coatings achieve densities approaching theoretical maximum , with porosity below 1%. Electrolytic hard chrome cannot compete on coating integrity for wear-critical surfaces.
Lower Porosity Than Plasma Spray
Atmospheric plasma spray produces coatings with 2–5% porosity as standard. HVOF's supersonic particle velocity closes that gap to below 1%, reducing pathways for corrosive ingress.
Safer Than Electrolytic Processes
HVOF uses no toxic hexavalent chromium chemistry. No hazardous waste streams. No environmental compliance burden. Better for the component, better for the facility.
MATERIALS WE SPRAY
ASCT sprays a full range of HVOF-compatible agglomerated and sintered powders , matched to your component's service environment, substrate material, and dimensional requirements. Our team selects the correct grade for your application before any coating begins
List of Materials
- Stellite
- Inconel 625
- Nickel
- Stainless steel
- Alloy
What HVOF Coating Fixes
REAL PROBLEMS & PROVEN SOLUTIONS.
Abrasive Wear
Slurries, sand-loaded fluids, and production contact grind components down before their design life ends.
HVOF tungsten carbide coatings resist abrasion at a level no untreated metal can match components last longer, maintenance cycles become predictable.
Erosion & Cavitation
High-velocity particle flows erode valves and pipework. Cavitation destroys pump impellers from within , progressive, invisible, expensive.
HVOF creates a dense metallurgical bond that absorbs impact and erosion forces, dramatically extending service intervals.
Corrosion & Chemical Attack
Saltwater, chlorine, sulphur compounds, and brines attack unprotected steel continuously , pitting, degrading, and shortening asset life.
HVOF chromium carbide and nickel alloy coatings seal the substrate completely. No pathways for corrosive ingress.
Dimensional Loss
Worn shafts, galled seats, and fretting journals fall out of tolerance. Standard answer: scrap and replace.
HVOF rebuilds worn surfaces to exact dimension , harder than the original. Ground and polished in-house. Back in service.
What Our HVOF Coatings Deliver
Extreme Surface Hardness
Coatings achieve 1,000–1,400 HV Vickers depending on material selected , meeting or exceeding hard chrome on every hardness metric.
High Bond Strength
Bond strength exceeding 70 MPa. Coatings resist delamination under cyclic mechanical load, impact, and thermal cycling throughout service life.
Low Surface Roughness
As-sprayed Ra typically 2–5 µm. Post-coat grinding and polishing achieves Ra 0.2–0.4 µm , suitable for precision sealing and bearing surfaces.
Wear & Erosion Resistance
Tungsten carbide HVOF coatings outperform hard chrome in abrasion, erosion, and cavitation wear across steel, aluminium, and stainless substrates.
Approved and Qualified Materials
We use only high-quality, industry-approved powders to ensure the performance and longevity of every coating.
Component Gallery
Have a component that needs coating?
Send us the component drawing, service environment details, and your required surface specification. Our team will recommend the right material and confirm feasibility within 48 hours.