Learn how supersonic spray technology is used in remanufacturing in three minutes!

       1. Supersonic spraying technology:



Arc spraying has the advantages of high manufacturing efficiency, low manufacturing cost, and small thermal exposure of the product workpiece. It is widely used in high-efficiency anti-corrosion and wear-resistant coatings, and occupies an important position in thermal spraying processing. However, compared with plasma spraying and supersonic flame spraying, the coating quality of arc spraying is generally lower, the fusion compressive strength is about 20MPa, and the porosity is 3%-10%, which limits the application of arc spraying.

Supersonic spray technology is based on increasing the particle rate. The Laval nozzle was chosen to improve the actual atomization of the gun and the acceleration of the particles by the cyclone. Particle velocity increased to supersonic speed. The prepared coating has high fusion compressive strength, low porosity and low surface roughness. Compared with ordinary arc spraying, the coating quality has been greatly improved, and it is close to the level of plasma spraying, which is further improved quality of the arc spray coating.

2. The basic principle of supersonic spraying is:



An arc ignited on top of the wire melts the evenly fed wire, and a supersonic cyclone accelerated by a Laval nozzle atomizes the molten metal spray wire into fine, well-distributed particles, which are sprayed onto the product workpiece to produce coating. Like ordinary arc spraying, supersonic spraying is a continuous and repeated whole process of melting, atomization and accumulation.



However, supersonic spraying is different from ordinary arc spraying in terms of the atomization method. Typically, subsonic arc spraying is used for atomization, while supersonic spraying is used for atomization. The atomized particles are fine and uniform, and the speed is fast, which is conducive to obtaining high-quality coatings.