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In flame spraying the coating material does not come into direct contact with the oxyacetylene flame. The material is therefore not melted directly by the flame, but by heater air and radiation heat.
Alternatively, high velocity oxy-fuel (HVOF) involves a continuous gas combustion under high pressure in a combustion chamber. The spray material, in powder form, is fed into the central axis of the chamber. The high pressure of the oxy-fuel gas mixture produced in the combustion chamber- and the expansion nozzle - in turn produces the desired high flow velocity in the gas jet. The fuel gases which can be used are propane, propylene, ethene, acetylene, and hydrogen.
Applications include sliding surfaces, roller, machine parts and all anti-wear protection parts.
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