Plasma sprayed coatings are used for dense, quality coatings like ceramics, cermets, metallic coatings, WC-Co and meet aerospace standards.
Plasma is the term used to describe gas which has been raised to such a high temperature that it ionises and becomes electrically conductive. In the case of Plasma spraying, the plasma is created by an electric arc burning within the nozzle of a plasma gun and the arc gas is formed into a plasma jet as it emerges from the nozzle. Powder particles are injected into this jet where they soften and then strike the surface at high velocity to produce a strongly adherent coating. Metallisation offer a Pistol Control Console Plasma Spray System, capable of spraying with a range of commonly available plasma pistols, as well as their own PS50 Pistol.
The plasma spray process uses an arc between two non-consumable electrodes to provide a plasma gas stream. Typically a powder feedstock is introduced into this plasma gas stream to heat the particles and propel them onto a surface to form a coating. APS is atmospheric plasma spray; plasma spray deposition carried out under standard atmospheric conditions. Chrome oxide can be deposited by the plasma spray process. It is commonly deposited onto printing rollers where the print pattern is laser etched into the surface of the chrome oxide.