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Plasma spray can be used to produce coatings. of virtually any metallic, cermet, or ceramic ma-. terial. The coatings are used for most of the types. of applications described in a subsequent section. The transferred plasma-arc process adds to. plasma spray the capability of substrate surface heat-. ing and melting. Figure 7 is a schematic repre-. sentation of the process.
Polymeric coatings made from polymeric materials can be applied on a variety of substrates using a number of different techniques such as extrusion/dispersion coating and solution application. Polymeric coatings designed for corrosion protection are usually tougher and are applied in heavier films than are appearance coatings.