What are the advantages of plasma spray technology?

       Plasma spray technology is a relatively new thermal spray technology. The principle of plasma spray technology is to change the surface properties of materials. heating the material to a certain melting or semi-melting

condition. They are blown into fine particles. A coating treatment method that uses island-shaped airflow spraying on the surface of a substrate to form various coatings. The size of the coating is the same as other spray methods.

  The size of the part is not limited, the substrate is wide, and the processing edge is small. Strengthen and other advantages.

1. The substrate is heated less, the parts are not deformed, and the heat treatment state remains unchanged. Because the part is not charged during spraying and the substrate is not melted, despite the high temperature of the plasma flame,

But the energy is very concentrated, and the axial temperature gradient of the plasma arc is very large. The accuracy of some thin-walled parts usually does not exceed 200°C, which is very beneficial to the accuracy of part shape modification. Due to the base

The heat treatment properties of the material will not change below 200°C, so some high-strength steels can be sprayed.

2. The process is stable and the coating quality is high. The plasma spraying process parameters can be quantitatively controlled, the process is stable, and the coating reproducibility is good. During plasma spraying, the velocity of the molten particles can be

to reach 180-480m/s or even higher, which is much higher than 45-120m/s during oxyacetylene flame powder spraying. When the molten particles collide with the part, the deformation is sufficient and the coating

Dense and high bond strength. The normal bond strength of plasma sprayed coating to base metal is usually 30-70mpa, while the normal bond strength of oxyacetylene flame spray is 5-20mpa. due to

The atmosphere can be controlled by changing the gas during plasma spraying, so the oxygen or nitrogen content in the coating can be greatly reduced.

3. There are various types of spraying materials and various types of coatings. Due to the high temperature of the plasma flame, various spray materials can be heated to a molten state. Therefore, plasma spraying can use more

A variety of materials can be obtained, and spray coatings with various properties can be obtained, such as wear-resistant coatings, thermal insulation coatings, high-temperature anti-oxidation coatings, insulating coatings, etc.; and so on. As far as the versatility of the coating is concerned,

Acetylene flame spraying, arc spraying, high frequency induction spraying and explosive spraying are all inferior to plasma spraying.