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       The wear damage that occurs when the surfaces of the metal parts of the compressor are in contact with each other or with the fluid and move relative to each other is not as serious as corrosion, but it is also a relatively common wear phenomenon. After the compressor parts fail, in order to ensure normal operation, it is necessary to repair and strengthen the surface to improve the wear resistance and corrosion resistance of the surface, which not only improves the service life, but also reduces the cost of replacement and improves economic benefits. . At present, thermal spraying technology is mostly used to repair its surface. Thermal spraying technologies such as supersonic spraying, plasma spraying, and arc spraying have remarkable effects in the application of spraying and repairing of compressor failure surfaces. Today, I will mainly introduce the application of supersonic spraying in the wear of compressor parts.



The speed of the flame produced by supersonic spraying at the nozzle outlet of the sprayer is generally 4 times the speed of sound, that is, about 1520m/s, which can be as high as 2400m/s (specifically related to the type of combustion gas, mixing ratio, flow rate, powder quality and powder flow rate, etc. related). The velocity of the powder hitting the workpiece surface is estimated to be 550-760 m/s, which is comparable to explosive spraying. The supersonic spraying method has the following characteristics:



1. The temperature of the powder particles is low and the oxygen is relatively light (this is mainly due to the short residence time of the powder particles in the high temperature and the short exposure time in the air, so the oxide content in the coating is low, and the chemical composition and phase composition are low. It has strong stability), but it is only suitable for spraying metal powder, Co-Wc powder and low melting point TiO2 ceramic powder;



2. The particle movement speed is high.



3. The particle size is small and the distribution range is narrow, otherwise it cannot be melted.



4. The coating has high bonding strength, high density and no delamination.



5. The surface roughness of the coating is low.



6. The spraying distance can be changed within a large range without affecting the spraying quality.



7. Thicker coatings can be obtained than explosive spraying, and the residual stress is also improved.



8. The spraying efficiency is high and the operation is convenient.




9. The noise is relatively large, and sound insulation and protective devices are required




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