The High Velocity Oxygen Fuel (HVOF) process produces durable metal, carbide and a multitude of specialty coatings. A complete line of powders is available, which is specifically engineered for application with the HVOF system. This coating technology can be utilized in a range of applications leveraging the ultra-dense HVOF coating properties and the resulting wear-resistance.
The high temperatures and high velocity present in High-Velocity Oxygen Fuel processes make safety paramount.
Thermach HVOF systems are the perfect mix of safety and performance. Easy-to-use controls, high-impact visual alarms, and a NEMA 12 enclosure provide accurate control over gauge and flow of ceramic and metallic coatings for the optimum corrosion resistance your customers expect.
How HVOF Spray Works
HVOF, High-Velocity Oxygen Fuel, is a process that excels in producing very dense, low porosity, hard-wearing coatings. Unlike other thermal spray processes, where the coating material is melted and sprayed onto the substrate, the HVOF process plasticizes the coating particulate before it hits the substrate.
The process works by mixing a fuel gas (commonly hydrogen, propane, or propylene) with oxygen in the torch’s combustion chamber. When the gas mixture is ignited, the combustion gases are accelerated through the nozzle at supersonic speeds, often producing shock diamonds in the exiting flame.
The powder is then injected into the gas stream axially or radially, where it softens and gathers speed. Upon impact, the high kinetic energy of the particulate transforms into thermal energy, further aiding in the deformation and interlocking of the particulate with the surface profile. The results are coatings that exhibit density, hardness, and bond strengths that other methods of thermal spray cannot produce.
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