Cold Spray Coating

Cold Spray is a high-rate material deposition process which involves spraying metallic and composite powders at supersonic velocities (800-1200 m/s) on to suitably prepared substrates. The powder particles are injected in supersonic gas jet, upstream of a De Laval nozzle wherein they attain velocities close to the gas velocity. Cold spray process consumes very less thermal energy when compared to other thermal spray techniques and hence holds the advantage of obtaining dense coatings without oxidation, grain growth and degradation. A unique advantage of cold spray technique is that it can coat nanocrystalline and amorphous powders using cold spray as it retains the powder properties in the coating