The process is limited to materials which can be made in wire form, but this can include flux cored wires in addition to solid wires of metals and alloys. This process is best suited to applications where large areas are required to be coated at low cost, and where density and bond strength are not particularly critical. EWI has a Miller Mogul Arc 400 EAS system. HVOF Spraying Equipment for the HVOF process consists of a controller for the gases, fuel, and powder, a powder feeder, and a torch. The main advantages of PAS are that it can spray any material and is widely used for spraying ceramics.
Deposits are generally of high density and have good adhesive strength.
Equipment at EWI EWI has the TAFA JP5000 HVOF system. The flame velocity, and hence the coating particle velocity, is the highest available from any commercial HVOF system, imparting high density and high tensile bond strength to the coatings produced. The temperature, velocity and resulting residual stress field also allow higher coating thicknesses to be produced than with other systems. The JP5000 system is the only one to run liquid fuel, employing low cost kerosene. The fuel and oxygen mixture is pressurized to 150 psi allowing a very high velocity flame approaching Mach 2.5.