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Coating
By using flame, electric arc / plasma or laser together with the right coating material, you will achieve exactly the surface you require.
It is easy and very profitable; you can improve resistance to wear, corrosion and heat. You can increase or decrease friction or change the electrical properties of the surface. Damaged surfaces can be repaired and faulty manufactured parts can even be given the right dimensions. In most cases the surface can then be treated without difficulty.
"Thermal spraying comprises processes in which surfacing materials are heated to the plastic or molten state, inside or outside of the spraying gun/torch, and then propelled onto a prepared surface. The substrate remains unfused." EN 657:1994.
The work to achieve dense layers has resulted in equipment where the kinetic energy is increased with reduced thermal input.
Further development of high velocity thermal spray methods has led to Cold Gas Spraying where the surface material is propelled and plasticised, hitting the substrate and thus forming the combination with the basic material. This procedure is similar to explosion welding.
