De-Laval-Type nozzle for cold spraying

Abstract

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.

Description

Technical field: [0001] The invention belongs to the thermal spraying field of surface treatment engineering, and in particular relates to a Laval nozzle with a rapid prototyping supersonic zoom tube structure used for cold spraying titanium and aluminum metal coatings. Background technique: [0002] When cold spraying metals such as aluminum and titanium that require a high critical velocity, the carrier gas and the metal need to be heated at the same time, and because the surface activity of aluminum and titanium is very strong, it is easy to react with oxygen at high temperature, so that the prepared cold spray coating The layer has high porosity, and the degree of oxidation is also high, resulting in reduced coating performance. At the same time, when the traditional Lavale zoom tube for thermal spraying is used for cold spraying, due to its unreasonable structure, the coating formation method is not suitable for the rapid and uniform preparation of cold spraying coating...

AI Technical Summary

Problems solved by technology

However, these nozzles are not suitable for spraying coatings such as aluminum and titanium that are easy to stick and oxidize, especially without considering the boundary effect of cold spray rapid prototyping, usually there are edge effects at the edge of the sprayed coating, which affects the speed and effect of spray forming , and the structure of the nozzle is complex, and the manufacturing process is also cumbersome

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