Flame Spraying

This is a useful process for applying relatively inexpensive coatings that typically contain high levels of oxides and porosity together with the option of achieving a rough surface finish.

The process relies on the chemical reaction between oxygen and a fuel of combustion to produce a heat source.

This heat source creates a gas stream with a temperature in excess of 3,000°C with correctly balanced conditions between oxygen and acetylene.

The feed stock material to be sprayed is fed into the flame in the form of a wire and compressed air is then used to atomise the molten metal and accelerate the particles onto the substrate.

The combustion powder process uses a similar technique, except that the wire feedstock is replaced with a powder.

Among others, the process is typically used for applying bond coat materials or materials for corrosion resistance applications.