In a plasma spray gun a plasma gas is ionized between an anode and a cathode. The plasma reaches temperatures between 15,000 and 20,000°C. A coating powder is injected into the plasma jet by a carrier gas, where it melts before depositing on the substrate, the object requiring the coating. The powder particles fuse together on the substrate forming a protective coating.
Because of the high temperature it is possible to spray virtually all existing materials and alloys. Plasma spraying is particularly suitable for materials with a high melting point such as ceramic materials.
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