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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