Metallizing Export Company Basni, Jodhpur, Rajasthan

The metal wire is fed concentrically into the flame, melted and atomized by the compressed air, and the molten droplets are propelled towards a prepared surface where they solidify and bond to the substrate to form a coating. . By controlling the rate of feed of the wire through the flame, we can control the melt and atomization of metals with various melting points.

The combustion powder process is similar to the combustion wire process, except that it has the advantage of using powder materials as the coating feedstock, which allows for a much wider range of coating material options. In addition, the use of powder allows for a greater degree of freedom for spray gun manipulation. The flame spray process is only limited by materials with higher melting temperatures than the flame can provide or if the material decomposes on heating.

In the arc spray process pair of electrically conductive wires are melted by means of an electric arc. The molten material is atomised by compressed air and propelled towards the substrate surface. The impacting molten particles on the substrate rapidly solidify to form a coating.

A plasma is an electrically conductive gas containing charged particles. When atoms of a gas are excited to high energy levels, the atoms loose hold of some of their electrons and become ionised producing a plasma containing electrically charged particles - ions and electrons.

The hvof (high velocity oxygen fuel) thermal spray process is basically the same as the combustion powder spray process (lvof) except that this process has been developed to produce extremely high spray velocity. There are a number of hvof guns which use different methods to achieve high velocity spraying. One method is basically a high pressure water cooled hvof combustion chamber and long nozzle. Fuel (kerosene, acetylene, propylene and hydrogen) and oxygen are fed into the chamber, combustion produces a hot high pressure flame which is forced down a nozzle increasing its velocity. Powder may be fed axially into the hvof combustion chamber under high pressure or fed through the side of laval type nozzle where the pressure is lower. Another method uses a simpler system of a high pressure combustion nozzle and air cap. Fuel gas (propane, propylene or hydrogen) and oxygen are supplied at high pressure, combustion occurs outside the nozzle but within an air cap supplied with compressed air. The compressed air pinches and accelerates the flame and acts as a coolant for the hvof gun. Powder is fed at high pressure axially from the centre of the nozzle.

Name : powder feeder type : model no. : mpf 700 description : 700 cubic centimeter, powder capacity

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