Patent ID: 7621466

Claim:
A nozzle for cold spray comprising: a hollow-type nozzle section including a convergence inlet section having a converging cross-section area, a throat area connected to a converging end point of the convergence inlet section, a buffer chamber, which expands out in a radial direction at an end point of the throat area to form a vacant volume, and a divergence outlet section connected to an end point of the buffer chamber; and a spray tube having an end point spray hole, the spray tube being disposed inside the hollow-type nozzle in such a manner that the end point spay hole of the spray tube is placed at the throat area, in the buffer chamber, or in the divergence outlet section, wherein the divergence outlet section is configured in the form of a linear type having a cross-sectional area wider than that of the throat area; wherein a gas flows in the hollow-type nozzle, and a mixture of gas and powder mixture flows in the spray tube; and wherein the powder reaches at a speed of 300-1,200 m/s at an exit of the divergence outlet section.