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 striking an electric arc between the nozzle and the electrode inside the plasma gun. The plasma jet then 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 that is capable to spray a range of commonly available plasma pistols, as well as our own PS50 pistol.
FAQs About Plasma Spray
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.
Plasma sprayed coatings are built up from the individual splats of feedstock deposited onto the substrate. The exact properties will vary with feedstock and process parameters but can be expected to have a low level of porosity and a cohesive strength lower that that of the wrought material.
APS is atmospheric plasma spray; plasma spray deposition carried out under standard atmospheric conditions.
Vacuum plasma spraying is the deposition of plasma sprayed coatings in an extremely low-pressure cell. This environment has extremely low levels of oxygen, results in an increased plasma plume velocity.
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.
Typically suspension plasma spraying will have a much lower throughput of coating material as much of the plasma energy will be absorbed in evaporating the liquid.