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 about of 10,000 K, the material is melted and propelled towards component’s surface. There, the molten droplets flatten, rapidly solidify and form a deposit. Commonly, the deposits remain adherent to the substrate as coatings. Plasma spraying process is used for wearing and corrosion protection, thermal insulation, repairing and restoring in several industrial sectors, using a wide range of materials: metal alloys, carbides, blends, cermets, abradables and oxide ceramics
The high temperature of a plasma jet makes it particularly suitable for spraying coatings of refractory metals and ceramics, including ZrO2, B4C and tungsten.
Plasma spraying is indeed a cutting-edge technology and high-end coating dense, oxide-free, and very pure.
Common Applications of Plasma Coatings are Combustion chambers, Blades and vanes, Hip ladles