The Application of Supersonic Spraying in The Surface Strengthening of Spiral Shafts

As a core component of equipment such as screw conveyors, extruders, and ship propellers, the screw shaft is subject to harsh working conditions such as high wear, high torque, and corrosive media for a long time, and is prone to problems such as surface wear and fatigue spalling. Supersonic spraying technology (HVOF/HVAF) significantly enhances the service life and reliability of the screw shaft through highly dense and high-bonding strength coatings.

The main failure modes of the screw shaft are:

Abrasive wear: Under the long-term friction of ores, plastic particles, etc., the thickness of the helical blades becomes thinner and the conveying efficiency decreases.

Adhesive wear: Contact between metals or high-temperature adhesion causes surface scratches and increased torque.

Corrosion and wear: Eroded by acid/alkali/salt spray environments, pitting corrosion and wear cause combined damage.

Fatigue spalling: During long-term operation, alternating stress causes the coating to crack, resulting in local coating peeling and exposure of the substrate.

Overview of Supersonic Spraying Technology \ n \ nSupersonic spraying is an emerging surface treatment technology that forms a dense coating by spraying the spraying material onto the surface of the substrate at a supersonic speed. Compared with traditional spraying methods, supersonic spraying has a higher spraying temperature and a faster spraying speed, which can effectively improve the adhesion and density of the coating. This technology has been widely applied in fields such as aerospace, automotive manufacturing and mechanical processing.

The supersonic spraying strengthening technology on the surface of spiral shafts, especially the application of tungsten coatings, provides a new solution for improving the performance of mechanical components. Through reasonable process design and parameter control, the wear resistance and service life of the screw shaft can be significantly improved, meeting the modern industry's demand for high-performance materials. With the continuous development of technology, supersonic spraying will demonstrate its unique advantages in more fields, promoting the progress and innovation of the manufacturing industry.