Gas Atomization

Cooling Dynamics

Spherical morphology results from the surface tension acting on the liquid metal as it falls through the inert gas column. When gas atomization is correctly tuned, the size distribution of the powder remains narrow to facilitate effective packing in secondary processes. Higher gas pressures lead to finer particles while lower speeds create coarser material suitable for simple sintering.

Argon is preferred when oxygen contamination must be kept at absolute minimum levels for aerospace components.

Process Sequence

Melts are prepared in induction furnaces before being poured through a ceramic nozzle into the blast of high pressure gas. Because gas atomization is a continuous sequence, the timing of the pour and the pressure settings must stay in perfect sync. Any variation in temperature changes the viscosity of the metal which alters the droplet size.

The chamber captures the solidified dust at the base while allowing the gas to be recycled or exhausted.

Resulting Quality

Metal cleanliness improves because the closed system prevents environmental interactions that occur in open air melting. Since gas atomization produces powder with uniform chemistry in every grain, the finished tools display incredibly predictable responses to heat treatment. It enables the creation of alloys with chemical compositions that would simply separate or crack if cast into standard large ingots.

This technique makes it possible to mass produce complex materials that were once confined to the research laboratory.