What phenomena occur during the introduction of high-pressure gas in supersonic spraying technology?

Supersonic spraying technology is a method of creating a high-pressure flame by burning combustion supporting gas and combustion gas in a combustion chamber, and then injecting a high-speed flame stream through a specially designed nozzle, which heats and accelerates the powder material fed into it and sprays it onto the surface of the substrate to produce a coating. Can be used with liquid fuels such as propane, propylene, hydrogen, acetylene, diesel, or kerosene.

The workpiece will not deform. In fact, the problem of surface deformation of workpieces in surface supersonic coating technology is worrying. After all, the workpiece has already been completed. If deformed during later production and processing, high-density parts may not be applicable.

Supersonic flames have high velocities but relatively low temperatures. For WC Co hard alloys, decomposition can be effectively controlled during the spraying process. The coating not only has high bonding strength, but also is dense and has superior wear resistance. Its wear resistance greatly exceeds that of plasma spray coating, comparable to explosive spray coating, and even surpasses that of electroplated hard chromium layer and spray melting layer, making it widely used.

Supersonic spray coating can enhance or regenerate the surface properties of materials, such as wear resistance, corrosion resistance, heat resistance, etc. And it plays a protective role in repairing the size reduction of parts caused by wear, corrosion, and poor processing. In addition, the surface of the material can also have special properties such as electricity, light, magnetism, etc. Supersonic spraying treatment involves mixing oxygen and gas, igniting them in the combustion chamber to generate a gas flow, and accelerating high-pressure gas through the nozzle. Introduce the powder into the heated airflow and accelerate it onto the surface of the component. It has obtained a thin laminated coating.

Supersonic spraying technology can repair waste parts during equipment maintenance, bringing them back to life; It is also possible to strengthen and pre protect in the manufacturing of new products. It can save a lot of energy, materials, and costs, and is an important practical technology advocated by the country for energy conservation, emission reduction, and low energy consumption.