Plasma Spraying
In plasma spraying process, the material to be deposited (feedstock) — typically as a powder, sometimes as a liquid, suspension or wire — is introduced into the plasma jet, emanating from a plasma torch. In the jet, where the temperature is on the order of 10,000 K, the material is melted and propelled towards a substrate. There, the molten droplets flatten, rapidly solidify and form a deposit. Commonly, the deposits remain adherent to the substrate as coatings; free-standing parts can also be produced by removing the substrate. There are a large number of technological parameters that influence the interaction of the particles with the plasma jet and the substrate and therefore the deposit properties. These parameters include feedstock type, plasma gas composition and flow rate, energy input, torch offset distance, substrate cooling, etc.
Read more about this topic: Thermal Spraying
Famous quotes containing the word spraying:
“[Ognev] recalled endless, heated, purely Russian arguments, when the wranglers, spraying spittle and banging their fists on the table, fail to understand yet interrupt one another, themselves not even noticing it, contradict themselves with every phrase, change the subject, then, having argued for two or three hours, begin to laugh.”
—Anton Pavlovich Chekhov (1860–1904)