Nozzle for cold spray and cold spray apparatus using same

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.