Deloro Stellite
1201 Eisenhower Drive North
Goshen, IN 46526
In the Plasma Spraying process, powder is softened or melted in the plasma gas stream, which also transfers the particles to the workpiece. The plasma arc is not transferred to the workpiece, it is contained within the plasma torch between an axial electrode and a water-cooled nozzle. The process is operated in normal atmosphere, in a shielding gas stream (e.g., argon), in a vacuum, or under water.
In the HVOF process, powder is introduced axially into a chamber in which a gas flame is constantly burning under high pressure. The exhaust gas exits through an expansion nozzle which produces a high-velocity gas stream. The powder particles are heated in this gas stream and transferred by it with high kinetic energy to the surface of the workpiece, forming a dense coating with excellent bonding properties.