What is the process flow of supersonic spraying?

The principle of supersonic spraying is to use two continuous input metal wires as consumable electrodes, generate an arc at their ends as a heat source, use compressed air to atomize the melting line, and spray at supersonic speed onto the workpiece to form a coating with high bonding strength, low porosity, and low surface roughness. Its advantages are good atomization effect, fine and uniform particles after atomization, fast speed, which is conducive to obtaining coatings. Using a Laval nozzle for spraying, the airflow velocity is increased to supersonic speed, enhancing the acceleration effect of the airflow on particles and thus increasing particle velocity. The higher the particle velocity, the greater the impact of particle deposition on the substrate, and the more complete the particle deformation. Beneficial for the bonding between particles and substrates, particles and particles, improving the bonding strength and cohesive strength of coatings; The particle velocity is high, the particles have a short flight time in the air before sedimentation, and there are fewer oxides during the flight process. Beneficial for particle bonding, thereby improving the cohesive strength of the coating and reducing the porosity of the coating.

Supersonic spraying uses materials with high hardness, wear resistance, corrosion resistance, and high-temperature oxidation resistance. The high-temperature metal nano spray layer seals the surface of the metal coating, providing protection. The protective layer gradually forms a smooth and dense spray layer at high temperatures, preventing oxygen from the air from passing through the small coating space. The gap can enter the coating for better wear resistance and corrosion resistance.

Technical Features

Compared to other supersonic flame spraying methods, HV-TCY-III portable supersonic spraying is air-cooled, with simple powder feeding and control devices. It takes 15 minutes from start to finish. This device is easy to carry and operate.

After successful spraying, WC+cobalt coating is obtained to replace hard chromium coating, which improves wear resistance by 3-5 times and has no environmental pollution problems.

3. The flame temperature is about 2800. Specially suitable for spraying metal ceramic materials such as WC Co, WC Co Cr, Ncr-cr3c2 that are prone to decomposition and melting at high temperatures.

HV-TCY-III can achieve both external and internal hole spraying. The small diameter of the inner hole is 75mm (the length of the inner hole spray gun is 600mm, 1000mm, and 1500mm respectively).

5. High flight speed High impact energy powder particles can form dense coatings with high bonding strength, and the stress formed in the coating is compressive stress.

6. The spraying distance can vary from 60mm to 120mm, but it does not affect the quality of the coating.