De-Laval-Type nozzle for cold spraying
A technology of cold spraying and nozzles, which is applied in the field of thermal spraying in surface treatment engineering, can solve the problems of cumbersome manufacturing process, no consideration of boundary effects, complex nozzle structure, etc., and achieve the effect of reducing speed drop
Inactive Publication Date: 2008-02-06
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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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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[0016] The nozzle designed and prepared according to the present invention has a supersonic portion of 180mm, a nozzle throat of Φ2, an outlet size of 2mm×10mm, a convergent section length of 40mm, and a convergent angle of 60°. The aluminum sample is sprayed at a carrier gas temperature of 200°C at room temperature, where the bonding force is greater than 20MPa, the deposition efficiency is greater than 80%, and the deposition part of the fixed-point spraying is about 5mm high.
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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...
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IPC IPC(8): B05B1/34B05B7/14
Inventor 黄国胜王洪仁
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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