Nozzle for cold spray system and cold spray device using the nozzle for cold spray system

A nozzle for a cold spray system comprising an inlet, a preheating region, a convergent shape part, a throat part and a conical divergent shape part widened forward from the throat part used for heating a raw material powder, which is introduced at the inlet of the nozzle located before the convergent shape part, the raw material powder shot as a supersonic flow from a spout provided at the tip of the divergent shape part, by using a working gas introduced at the inlet, wherein

• the working gas has a temperature equal to or lower than a melting point of the raw material powder,
• the preheating region is provided at a front side of the nozzle and before convergent region,
• the length of the convergent shape part is 200 mm to 1000 mm, and the nozzle is provided with a heating device located after the introduction of raw material powder and surrounding the preheating region forward of the convergent shape part to heat a mixture of the working gas and the raw material powder, wherein the heating device is a built-in electric heater selected from a wound electric heater unit, an electrical resistance heater, and an electromagnetic heater.