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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.
Plasma Gases. Fabricators can process stainless steel with clean-cut surfaces by using nitrogen or a blend of oxygen and nitrogen as a plasma gas. These plasma gases provide a nonoxidizing plasma arc, which produces a clean-cut edge that is weld-ready without secondary operations.