What is the development process and application of supersonic spraying?

During the spraying process, the temperature, velocity, and spraying environment (including atmospheric and substrate conditions) of the sprayed material particles are the key factors determining the spraying quality (explanation: an important component of metaphorical things). According to the theory of thermal spraying, the speed of sprayed particles largely depends on the speed of the sprayed smoke flow.

The acceleration of sprayed particles is proportional to the square of the plasma jet velocity and density (unit: g/cm3 or kg/m3); It is inversely proportional to the size and density of the sprayed particles. Therefore, in order to obtain coatings with high bonding strength and low porosity, thermal spraying technology will develop towards low-temperature spraying with high-speed flight speed.

In recent years, the development of supersonic arc spraying, multifunctional supersonic flame spraying, and multifunctional supersonic micro arc plasma spraying has been a breakthrough in improving smoke flow velocity and particle velocity, and enhancing spray gun structure design. Aviation kerosene and oxidizer supersonic spray fuel (O2) is introduced into the combustion chamber by mixing and explosively burning in a certain proportion, and the high-temperature gas generated by combustion passes through the expansion tube at high speed and supersonic speed.