Plasma spraying

Plasma spray powder service

Overview:

Plasma spraying technology uses a plasma arc driven by a direct current as a heat source to heat ceramics, alloys, metals and other materials to a molten or semi-molten state, and spray them on the surface of the pretreated workpiece at high speed to form a firm surface layer. . Plasma spraying medical application: spray a layer of tens of micrometers on the surface of the artificial bone as a method to strengthen the artificial bone and enhance its affinity.

Principle of spraying:

The non-transferred plasma arc is used as the heat source to heat, accelerate and coat the sprayed material. The plasma flame has a high temperature and a fast flow rate, so the spraying efficiency is high, the coating is dense, the bonding strength is high, and the heat-affected zone on the surface of the substrate is small.

Advantage:

①Compared with oxygen-acetylene flame spraying, the plasma flame temperature is high and the energy beam is very concentrated. It can melt all the powders with high hardness and high melting point. Therefore, it can be used for a wide range of spraying materials and can be used to prepare a variety of coating.

②Because the flying speed of sprayed particles can be as high as 200-500m/s, the resulting coating is smooth and dense, and the powder deposition rate is high.

③The substrate is not charged or melted during the spraying process, and the relative movement speed of the substrate and the spray gun is fast, so that the substrate structure does not change. Will not affect the shape and performance of the substrate due to heat.

④The working gas is an inert gas, which protects the substrate and powder from oxidation, and there are few impurities in the coating.

⑤Simple operation, low equipment maintenance cost, and good adjustment performance.

Application:

The plasma arc flame has a high temperature and is suitable for spraying high melting point materials. The coating density can reach 85~98%, and the bonding strength can reach 35~70Mpa. Mainly used  

1. Wear-resistant and anti-friction coating;

2. Corrosion resistant coating;

3. Anti-high temperature oxidation, resistance to high temperature air flow erosion, thermal barrier coating;

4. Manufacturing metal and ceramic high melting point composite materials.