Introduction to AcuKote HVAF
AcuKote High-Velocity Air-Fuel Spraying (AcuKote HVAF) is a
process for deposition of high-quality coatings of metals, alloys,
cemented carbides, and borides onto metallic surfaces.
Coating material in a form of pre-alloyed or composite powder is fed
into a spray gun. The gun combusts compressed air and fuel gas (propane,
propylene, natural gas, etc.) generating high-velocity jet of combustion
products. In the jet, the spray powder is heated and accelerated and,
when impacting a work piece (substrate), forms a coating.
Since the combustion temperature of air-fuel mixtures is relatively
low, it is possible to gradually and precisely heat the spray powder to
the desired temperature, preferably a few degrees below the material's
melting point, performing deposition of coatings in a "solid particle"
The AcuKote HVAF gun accelerates the powder to a very high velocity, in the range of 4,000 feet/sec., even for such heavy particles as tungsten carbide. This is essential for producing dense and well-bonded coatings.
Precise temperature control of the spray material near the melting
point and high impact velocities are the distinguished characteristics
of the AcuKote HVAF coating deposition process.