At Alphatek, HVOF tungsten carbide thermal spray coatings are amongst the most frequently applied wear resistant surface treatments. With unparalleled experience in HVOF thermal spray techniques and technology, we deliver best in class coating results. Our HVOF thermal spray capabilities allow for the coating of a wide range of complex parts and equipment, from small individual components up to large drums, rails and tanks of all sizes and shapes. We have both the space and the expertise to handle large and heavy components, and also the capability to deliver high-throughput of smaller, high-volume processes.
The HVOF (High Velocity Oxygen Fuel) thermal spray process involves the combustion of a fuel gas and oxygen in a pressure chamber, with temperatures reaching 5,000°F (3,000°C). The super-heated gas is ejected at high pressure and supersonic speed through a nozzle at which point tungsten carbide powder is introduced to the gas mixture.
The high-energy tungsten carbide particles strike the substrate to be coated and bond instantaeously. The coating is built up by the application of additional layers in rapid succession. The resulting coatings have extremely high bond strength and offer exceptional levels of wear resistance.
The specific performance characteristics of the tungsten carbide coating can be modified by varying the specifications of the tungsten carbide powder and binding agent – usually Cobalt. Variations in grain size and temperature of application can greatly affect bond strength, wear characteristics, susceptibility to erosion and corrosion; allowing for the tailoring of HVOF tungsten carbide coatings to match specific application requirements.
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