Flame Spraying

Flame spraying is used primarily to produce metallic coatings to resist wear or corrosion and to repair worn areas on machinery parts. In this process, oxygen and a fuel gas (usually acetylene) are combusted in a low pressure torch to produce a flame that is directed through a nozzle. A  feedstock material, in either wire or powder form, is fed into the flame and is melted. A compressed air jet atomizes the molten droplets and
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propels them against the substrate. The resulting coating is usually machined or ground to the required tolerances. In some instances, a coating is fused after spraying and before finishing. In the fusing process, a coating is heated to a cherry red state to purify it and to improve its bond with the substrate.                                                                                      NCT uses flame spraying in such applications as aluminizing of silencers, repairing of worn machinery components and in the manufacture of our stainless steel pump sleeves.