HVAF Arc Spraying

HVAF Arc process deposited coatings of dual wire stock, fused by an electric arc and atomized by a high-velocity jet of air and gaseous fuel combustion products. The HVAF jet was generated in toroidal chamber, where a hot catalytic insert activated the combustion process. Such atomization produced fine, 5-20 micron, spray particles accelerated to over 200 m/s. Excess of fuel in the arc zone prevented rapid oxidation of fused material. The process is specifically beneficial for deposition of high-quality coatings of aluminum, corrosion resistant nickel-base alloys and hardface Fe-Cr-B-C cored wires.