What is supersonic spraying technology?

What is supersonic spraying technology? Let's first understand what thermal spraying technology is? Thermal spraying is a new technology that uses thermal energy to melt or semi melt the material to be coated, atomize it into micro droplets or high-temperature particles, and spray them at high speed onto the surface of cleaned or pre treated mechanical parts to form a coating with certain characteristics. Thermal spraying technology is a new technology for surface strengthening and protection of materials, which plays an important role in surface modification technology and has always been a key new technology project promoted in China.

Thermal spraying uses different heat sources and forms, including plasma spraying, supersonic flame spraying, arc spraying, explosive spraying, and laser melting. According to the shape of the spraying material, it can be divided into powder spraying, silk spraying, ceramic rod spraying, etc.

Therefore, according to the different requirements of coating performance for different workpieces, different thermal spraying forms and coating materials need to be selected to achieve the design requirements of various coatings. Due to the new thermal spraying technology, a thin and dense coating can be formed on the surface of various mechanical components, which has special properties such as high wear resistance, corrosion resistance, insulation, radiation resistance, high temperature resistance, oxidation resistance, thermal insulation, conductivity, and structural properties. It can restore and extend the service life of mechanical equipment, and make scrapped parts "come back to life". The working faces of different equipment can be influenced by different equipment, achieving "turning iron into gold, wearing helmets and armor", saving labor, materials, energy, and improving work efficiency, thereby obtaining significant economic and social benefits. Therefore, it has been widely used in aerospace, aviation, metallurgy, chemical industry, shipbuilding, machinery, coal, electricity, petroleum, textile and other fields.

The core technology of supersonic spraying is an important core technology in surface engineering. Compared with other core spraying technologies, it is a low-power spraying core technology with broad application prospects. It has high material accumulation rate, high production efficiency, low energy consumption, high comprehensive spraying efficiency, and good coating product quality (manifested as dense coating, high bonding strength, excellent wear resistance and impact corrosion resistance). It is a low-power spraying core technology with broad application areas in light industry, military, aerospace and other fields. It can extend the service life of the workpiece. Its spraying speed can reach over 400-800m/s.

Supersonic spraying is the core technology of thermal spraying. Using a rigid non transferable plasma arc as a heat source, the working gas is heated to form a high-temperature and high-speed plasma jet (temperature can reach tens of thousands of degrees Celsius). Materials such as non melting metals, carbide ceramics, and oxide ceramics are fed into the jet, such as tungsten carbide (WC), which accelerates the formation of molten particle flow and impacts the substrate surface at high speed to form a coating, such as tungsten carbide coating - a high hardness and wear-resistant coating second only to diamond.

The core technology has been widely used in aerospace, aviation, chemical, shipbuilding, machinery, electricity, textiles and other applications. Because it can meet the high requirements for coatings, especially in front-end applications, such as high melting point, high strength, and high purity.