Flame spraying is melted in an oxyacetylene flame, usually an acetylene / oxygen mixture, the material, atomized by air pressure and thrown on the substrate to be coated. For better quality layers can be sprayed with nitrogen. Through this process it is inert, the molten material does not react with oxygen in the air and no oxides are formed in the layer.
A distinction between the flame spraying of powder and wire flame spraying, with the wire flame spraying is to give clear preference.
Compared to ARC SPRAYING are flame sprayed layers somewhat thicker and finer, but also a little more expensive. At thicknesses of 0.5 mm was conditioned by the higher deposition rates, the arc spraying can be selected.
Classical materials for wire flame spraying are Copper, silver, tin and molybdenum.
For the flame spraying of powder only ceramic materials are worth mentioning. But this should necessarily be applied with PLASMA SPRAYING .
Flame sprayed layers are:
- increase the electrical conductivity of silver, copper, tin
- the increase of thermal conductivity of copper
- the increase of the friction coefficient of components by molybdenum
- the corrosion protection by Alu
- the electrical isolation through alumina ceramic
- the wear protection of other ceramic materials