Vacuum induction melting gas atomization (VIGA process)
Vacuum induction melting gas atomization method means that in vacuum environment, the coil induction heating principle is used to melt the charge, after reaching a certain temperature, the melting chamber and atomization chamber are filled with atomizing gas, and then the molten steel is poured into the tunic, and the metal liquid flow is formed through the nozzle into the atomization chamber [18], and then the high-pressure inert gas is used as the atomizing medium to break the continuous metal liquid flow. It quickly solidifies into fine particles, that is, metal powder. FIG. 1 shows the schematic diagram of aerosol vaporization principle.
Figure 2 shows the powder produced by vacuum induction melting gas atomization process. From the surface morphology, it can be seen that the particle size of the powder obtained by gas atomization method is dispersed, generally about a few microns to more than 100 microns, and the sphericity is preferred, but there are satellite powder and adhesion powder.
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