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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.
Nitrogen plasma and oxygen plasma provide similar results when used for plasma treatments. Basic surface activation and plasma cleaning processes use either oxygen or nitrogen plasma to raise the surface energy of a material. Whether oxygen or nitrogen plasma is used depends on what type of material is being treated. However, oxygen is usually more effective and is often the first choice for plasma treatments. Since air is composed of approximately 70% nitrogen and 30% oxygen, it is often used to perform plasma treatments as a less expensive, yet still very effective method.