Deposition techniques
What is atmospheric plasma spraying?
Atmospheric plasma spraying is a very versatile thermal spraying process. With atmospheric plasma spraying, molten powdered materials are sprayed onto the surface of another material using plasma arcs.
In the atmospheric plasma spraying (APS) process, metals or alloys are melted and sprayed onto a surface using a plasma jet heated to more than 10,000 °C.
Atmospheric plasma spraying can be used with a wide range of materials and creates a high-quality and repeatable coating. It is often used to protect against wear, corrosion, oxidation, for thermal insulation or to improve a substrate’s function.
Atmospheric plasma spraying employs a technique essentially similar to PTA welding. The difference is that the flame comprises an electrically excited plasma of high velocity and temperature (≈15,000°K). This permits a denser coating (95-98%). Deposition rates range from 2 to 8 kg/hour, and surfacing thickness from 0.1 to 2.5 mm.
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