Supersonic Spraying

The supersonic flame spraying process uses fuel (hydrogen, propylene, aviation kerosene, etc.) and high-pressure oxygen to mix and ignite in a special combustion chamber. The violently expanding gas is constrained by a water-cooled nozzle to form a supersonic high-temperature flame flow, with a speed of up to 1500~2000m/s and above. At the same time, the powder particles are fed into the flame flow by the powder feeding gas (nitrogen or argon) through the powder feeding hole. They are heated and accelerated by the flame flow and hit the prefabricated workpiece surface at high speed, forming a thermal spraying process with high bonding strength and good density. method. Due to the extremely high speed of the flame flow, the speed of the powder particles can be as high as 500~750m/s while being heated to a molten or semi-melted state.

Due to the high bonding strength of the coating, diverse material selection, and small impact on the base material, the supersonic flame spraying process is recognized by more and more industries. It has been successfully used in power steam valves, aircraft engine parts, and steel hot-dip galvanizing rollers. , petrochemical valve plungers and other products, and become the best solution under many harsh working conditions.