Cold Spray Deposition on Inner Side of Pipe with Aid of Radial Supersonic Nozzle

This work evaluates a new cold-spray technique for coating the inner surface of pipes. Rather than rotate the pipe as in previous methods, a radial supersonic nozzle is translated along the pipe axis, leaving behind a continuous coating. In a demonstration, the new method is used to apply aluminum, copper, and nickel coatings inside steel and aluminum pipes with inner diameters of 45-100 mm.