Plasma is the term used to describe a gas which has been raised to such a high temperature that it ionises and becomes electrically conductive.

When Plasma Spraying, the plasma is created by an electric arc burning within the nozzle of a plasma gun. The arc gas is formed into a plasma jet as it emerges from the gun nozzle. Powder particles are injected into this jet where they melt and then strike the surface at high velocity to produce a strongly adherent coating. Almost any material can be sprayed including metals, ceramics and plastics. The workpiece remains cool because the plasma is localised at the gun. Applications for plasma sprayed coatings can be found in all industries - ranging from scuff resistant coatings on piston rings to thermal barriers on turbines and abrasion resistant coatings in the textile and paper industries.

 

Typical examples are:
Turbocharger Bearings running at 80,000rpm.
Mechanical Seals/ Gland Packing subject to corrosion and abrasion.
Aircraft Engine Burner cases subject to flame inpingement.

Metal Spray Suppliers (NZ) Ltd provides a specialised Plasmaspray product:

The PS50M-PC System

 

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