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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.
The metal used for deposition may be either in the form of wire or powder. When coating material is used in powder form it is known as powder metallizing. When it is in wire form the process is called wire metallizing. Coating thickness may vary from .004 to thicker coats in the range of .012 - .014.