Flame spraying
Autogenous wire spraying
For years this was the method to apply anti-corrosion topcoats and was also used for surface restorations. The spray wire is brought into an autogenous flame (2,900°C), where it melts through the heat. Compressed air around the flame atomises the melted end of the wire. This way a ray of melted particles is created towards the surface of the work piece.
- Typical materials
Zinc, molybdenum, chrome steel
Autogenous powder spraying
The material to be sprayed is injected continuously in the form of powder into an autogenous flame where it melts. The gas flow carries the melted powder in the direction of the substrate (50m/s). On the surface it quickly solidifies, so as to form a top layer.
- Typical materials
Nickel-aluminium, chrome steel, stellite