High velocity spraying process HVOF

The "hybrid spray" process utilized in this study was conceptualized in our laboratory at the University of Michigan (Kosikowski et al., 2005). This process combines the arc and high velocity oxy fuel (HVOF) spray techniques molten metal at the arcing tip is atomized and rapidly propelled to the substrate by a HVOF jet. This so called "hybrid" concept shown in Fig. 5 offers many advantages. 

Thermal spray processing A coating process where material (wire, rod, powder) is melted by a flame, plasma, electric arc, or some other means and the molten particles are propelled in a high velocity gas stream to the substrate surface, where they are splat cooled at a high quench rate. See also Arc-wire spray Detonation flame spraying Flame spray High velocity oxygen fuel (HVOF) spray Plasma spray. 

For gas combustion processes, the lower-energy flame spray process uses oxyfuel combustible gas as a heat source to melt the coating material, which may be in the form of rod, wire, or powder. In the higher-energy, high-velocity oxyfuel combustion spray (HVOF) technique, internal combustion of oxygen and fuel gas occurs to produce a high-velocity plume... 

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