The working principle of plasma spraying is: the main gas and secondary gas are input from the gun body behind the spray gun. The main gas flow between the tungsten electrode and the primary nozzle is small. The secondary nozzle sprays. The coating processed by plasma spraying has the following characteristics: the coating of the high melting point material is uniform, the coating is dense and hard, the porosity is small, and the ceramic coating of the high melting point material has high bonding strength.
There are more and more kinds of surface modification technologies, such as surface coating, ion implantation and ion extraction.
Plasma spraying is a new type of multi-purpose precision spraying method that has been vigorously developed after flame spraying. It has many advantages. For example, first of all, plasma spraying has ultra-high temperature characteristics, which is convenient for spraying high melting point materials. Second, the plasma spraying sprays particles at a high speed, the coating is dense, and the bonding strength is high. Third, due to the use of inert gas as the working gas, the plasma spraying material is not easily oxidized.
Plasma spray processing is carried out by plasma arc. Ion arc is compressed arc. Compared with free arc, its arc column is thin, current density is high, gas ionization degree is high, so it has the characteristics of high temperature, concentrated energy and good arc stability. .
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