Method detonation spraying the surfaces of the parts

 

(57) Abstract:

The way destinationnode sputtering surfaces of the parts, ensuring the quality of the workpiece and the performance is done using blast feeding the powder from the metal in a gaseous state, which ensures the highest quality of the workpiece with improved performance compared to existing similar. 1 C.p. f-crystals, 1 Il.

The invention relates to the field of surface treatment of workpieces by means of evaporation.

On the literary source known method destinationnode spraying circuit device, where the sprayed powder is fed into the chamber from the top, which does not provide a more uniform flow of the sprayed powder, and also qualitative purging with nitrogen, because he also served in the camera in a perpendicular direction relative to its axis. In addition, the powder supply is made through the pipeline without the presence of metal in a gaseous state, which also reduces the quality of the sprayed layer on the treated surface.

The proposed method differs from the existing literature that the supply of powder and nitrogen into the chamber probranom, providing all of these higher quality of the sprayed layer.

The drawing shows a diagram of the applied method.

This method of spraying a melt of metal, its dispersion and migration to the surface is achieved due to the energy of the explosion of a mixture of acetylene and oxygen.

The deposition of the metal in the chamber water cooled target apparatus for spraying served in a ratio of acetylene and oxygen. Then is introduced into the chamber by means of a jet of metal in a gaseous state the sprayed powder with a grain size of 30 to 100 μm, before entry into the chamber of the powder in the pipeline is nitrogen. The gas mixture is ignited by an electric spark. The blast wave tells the particles of powder of high speed flight, which is at a distance of 75 mm from the edge of the trunk reaches 800 m/s

After application of each dose of powder to the barrel of the apparatus is purged with nitrogen to remove products of combustion. This process is repeated automatically with a frequency of 3...4 times per second per cycle. On the surface of the part is coated with a layer of metal with thickness up to 6 mm.

Example. Is destinationa surface treatment part 4, where the camera 2 original filed acetylene through put in gaseous form through the pipe 5) the sprayed powder with a grain size of 30 to 100 μm, and in front of the camera of the powder through the pipeline 8 into the main channel is nitrogen. The gas mixture is ignited by an electric spark, spark 1. The blast reports the resulting mixture 2 high speed, feeding her in the barrel 3 to the processed surface, forming a sprayed layer 9.

After application of each dose of powder to the barrel of the apparatus is purged with nitrogen to remove products of combustion.

The advantages of this method of deposition are high performance process (with a trunk diameter of 20-25 mm for 15 seconds is applied to a coating thickness of 0.4 mm on the area up to 5 square cm), high adhesion of the coating to the surface of the part, the low temperature of the surface (no more than 200oC).

The disadvantages of the process include high noise levels (up to 140 dB), which necessitates the execution of works by coating in a special sound-proof chamber.

Literature

"Capital repair of the car", Moscow. "Transport", 1989, Yesenberlin, page 174.

1. Method detonation spraying on the surfaces, in the course of which the supply of powder in the chamber of the barrel of the apparatus for spraying powder on the Rui metal in a gaseous state.

2. The method according to p. 1, characterized in that the supply of powder by means of a jet of metal in a gaseous state is performed from the back side in the center of the trunk.

 

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