Anti-Wear Coatings – HVOF Spraying Solutions from China Suppliers and Factory for All Industries
Product Description
High Velocity Oxygen Fuel (HVOF) is a high-end wear-resistant and corrosion-resistant strengthening process in the field of industrial surface engineering.
This process uses fuels such as kerosene and propane with high-pressure oxygen as a medium. The mixture is thoroughly mixed and intensely combusted in the combustion chamber of the spray gun, generating a high-speed flame with speeds exceeding Mach 5 (temperature 2600–3200℃). High-performance powders such as tungsten carbide and nickel-based alloys are fed into the flame, where they are instantly melted and accelerated to ultra-high speeds of 500–800 m/s. This powerful kinetic energy impacts the workpiece surface, forming an extremely dense and highly adhesive functional coating through a combination of metallurgical bonding and mechanical adhesion.
Customized specifically for core wear parts of petroleum machinery (plugs, valve seats, gates, valve cores, valve discs, etc.), it is perfectly adapted to the extreme working conditions of drilling, well workover, and oil and gas transportation, such as high pressure impact, sand-containing mud erosion, acid and alkali corrosion, and high temperature friction. It solves the problems of rapid wear, short life and seal failure of parts from the root, and is the core surface treatment solution to improve the reliability of petroleum machinery equipment.
Customized specifically for core wear parts of petroleum machinery (plugs, valve seats, gates, valve cores, valve discs, etc.), it is perfectly adapted to the extreme working conditions of drilling, well workover, and oil and gas transportation, such as high pressure impact, sand-containing mud erosion, acid and alkali corrosion, and high temperature friction. It solves the problems of rapid wear, short life and seal failure of parts from the root, and is the core surface treatment solution to improve the reliability of petroleum machinery equipment.
Product Specifications
| Process Type | High-Voltage High-Frequency Flame (HVOF) Coating |
| Common Coating Materials | Tungsten carbide cobalt (WC-Co), tungsten carbide chromium cobalt (WC-Cr-Co), nickel-based alloys (Ni60/Ni60A), cobalt-based alloys |
| Coating Thickness | 0.03–0.5mm (customizable to workpiece requirements) |
| Hardness | HRC75 |
| Bonding Strength | ≥70MPa |
| Porosity | <1% |
| Operating Temperature Resistance | -60℃ ～ +650℃ |
| Applicable Substrate Materials | 42CrMo, 35CrMo, 2Cr13, carbon steel, stainless steel, alloy structural steel |
| Machining Accuracy | Precision grinding after coating; dimensional tolerances up to ±0.01mm |
Product Features
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1Superior Wear and Erosion Resistance The coating boasts a hardness of HRC75, resisting high-speed erosion from rock cuttings and silica sand in drilling mud. Its wear resistance is 8–15 times that of ordinary quenching and electroplating processes, significantly extending the service life of components.
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2Extremely Dense and Corrosion-Resistant With a porosity of <1%, there are no leakage channels, effectively blocking corrosive media such as oil and gas, drilling fluids, and saline water, preventing substrate rust and corrosion failure.
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3Strong Bond and No Peeling The coating achieves a high-strength bond with the substrate, remaining resistant to peeling, cracking, and flaking even under high-pressure impact and high-frequency opening and closing conditions, ensuring maximum stability.
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4Excellent High-Temperature Resistance It can operate continuously in environments ranging from -60℃ to +650℃ without softening or deformation, making it suitable for high-temperature oil and gas well operations.
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5Controllable Dimensional Accuracy Precision spraying combined with subsequent fine grinding processes strictly guarantees the assembly accuracy of components, meeting the high-precision sealing requirements of petroleum machinery valve assemblies.
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6Excellent Adaptability to Various Working Conditions Simultaneously withstands multiple extreme working conditions including wear, corrosion, impact, and high temperatures, perfectly matching the core component requirements of oil drilling, mud pumps, and manifolds.
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7Outstanding Overall Cost-Effectiveness Reinforced components extend lifespan by 5–10 times, significantly reducing equipment maintenance and downtime replacement costs, and improving operational efficiency.
Product Packaging
Standard Export Packaging
Inner: Rust-proof protective bag
Outer: Fumigation-free plywood case or export carton
Shockproof, moisture-proof and anti-corrosive, ensuring safe ocean transportation.
Product Transportation
- Ocean Transportation
- Overland & Rail Services
Frequently Asked Questions
Q1
What is HVOF spraying and how does it differ from conventional thermal spray processes?
HVOF (High Velocity Oxygen Fuel) spraying uses high-pressure oxygen combined with fuel such as kerosene or propane to generate a supersonic flame exceeding Mach 5. Compared to conventional flame spray or plasma spray, HVOF produces coatings with significantly lower porosity (<1%), higher bond strength (≥70MPa), and greater hardness (up to HRC75), making it ideal for demanding wear and corrosion protection applications.
Q2
What coating materials are available for HVOF spraying?
Common coating materials include tungsten carbide cobalt (WC-Co), tungsten carbide chromium cobalt (WC-Cr-Co), nickel-based alloys (Ni60/Ni60A), and cobalt-based alloys. The optimal material is selected based on the specific working conditions, substrate material, and performance requirements of each application.
Q3
What substrate materials are compatible with HVOF coatings?
HVOF coatings are compatible with a wide range of substrate materials, including 42CrMo, 35CrMo, 2Cr13, carbon steel, stainless steel, and alloy structural steel. These are commonly used in petroleum machinery components such as plugs, valve seats, gates, valve cores, and valve discs.
Q4
How thick can the HVOF coating be applied, and what dimensional accuracy can be achieved?
The coating thickness can be customized from 0.03mm to 0.5mm depending on the workpiece requirements. After spraying, precision grinding is performed to achieve dimensional tolerances up to ±0.01mm, ensuring the high-precision sealing and assembly requirements of petroleum machinery valve assemblies are fully met.
Q5
In what temperature range can HVOF-coated components operate?
HVOF-coated components can operate continuously in environments ranging from -60℃ to +650℃ without softening or deformation. This makes them highly suitable for high-temperature oil and gas well operations as well as cold-environment applications.
Q6
How much can HVOF coating extend the service life of petroleum machinery components?
HVOF-reinforced components typically extend service life by 5–10 times compared to untreated or conventionally treated parts. The coating's wear resistance is 8–15 times greater than ordinary quenching and electroplating processes, significantly reducing equipment maintenance frequency, downtime, and overall replacement costs.