Powder Flame Spraying

       

Powder flame spraying is a kind of thermal spraying method which uses gas combustion flame as heat source and powder as spraying material. The spraying powder is naturally dropped from the feeding tank or sent into the air flow inside the spray gun by the automatic powder feeding device. Under the action of the air flow, the powder is ejected from the combustion flame at the end of the spray nozzle. In flight, it is heated and accelerated to become fast flying molten particles, which collide with the substrate surface and deform into flat particles to form a coating.

The spraying material of powder flame spraying is not wire but powder. In flame spraying, acetylene and oxygen are usually used for combined combustion to provide heat. Methylacetylene, propylene diene (MPS), propane, hydrogen or natural gas can also be used. Flame spraying can spray metal, ceramic, plastic and other materials, the application is very flexible, the spraying equipment is light and simple, movable, the price is lower than other spraying equipment, the economy is good, it is a widely used method in spraying technology.

However, flame spraying also has obvious shortcomings. If the particle velocity is small and the flame temperature is low, the bonding strength and the comprehensive strength of the coating itself are low, and the porosity is lower than that obtained by other methods. In addition, the center of flame is oxidation atmosphere, so attention should be paid to high melting point materials and easily oxidized materials. In order to improve the shortcomings of flame spraying, improve the bonding strength and coating density, compressed air or air flow acceleration device can be used to increase the particle velocity; It is also possible to change the compressed air stream from air to inert gas to reduce the degree of oxidation, but it also increases the cost.

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