The present invention belongs to the
thermal spraying field of the surface treatment
engineering, which relates to a laval
nozzle of
rapid prototyping supersonic converging-diverging
tube structure for cold spraying the
titanium and
aluminum metal coating. The major structure comprises an inlet of the main gas path, a main power feeding gas path, an assistant power feeding gas path, an interface of pressure probe, an interface of temperature probe, an
ultrasonic nozzle, a fixing bolt, a
gas chamber, an air locker structure, and a
gasket. The laval
nozzle is characterized in that the
air chamber and the split
air chamber structure are fixedly connected by the fixing bolt and formed a whole structure of
axial symmetry, and the center of the back end of the main body of the
nozzle is provided with the main power feeding gas path; the up side of the main power feeding gas path is provided with the angle-inserting inlet of the main gas path, and the up and down sides of the main
air chamber of the main body of the nozzle are provided with the interface of the pressure probe and the interface of the temperature probe separately; the inlet of the main gas path and the main power feeding gas path are converged at the inside of the nozzle body and communicated with the
ultrasonic nozzle separately, and the nozzle of the
ultrasonic nozzle is provided with the assistant power feeding gas path; the present invention reduces the speed of the particles along the interface direction, and spraying can be realized by a common typical nozzle.