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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 fuel used is a low-density hydrogen plasma. To ignite the fusion fire the plasma has to be confined in magnetic fields and heated to a high temperature. In the core 100 million degrees is attained. Tungsten is a highly promising metal as material for components coming into direct contact with the hot plasma.