Metal powder classification for additive manufacturing
Additive manufacturing processes such as powder bed fusion require metal powders with tightly controlled particle size distributions. Even small variations in particle size influence powder flowability, layer density and the stability of the printing process. Powder classification systems from Hosokawa Alpine are designed to separate metal powders precisely after atomisation, helping producers maintain consistent powder quality for additive manufacturing applications.
Particle size control
During metal powder production, atomisation generates a broad particle size distribution containing both oversized particles and ultrafine fractions. Conventional sieving can remove the largest particles but becomes less effective when precise separation cuts, inert gas operation or frequent product changes are required. Air classification systems such as the Turboplex ATP allow adjustable separation cuts typically between 5 and 120 µm, enabling the removal of coarse and fine particles while producing steep particle size distributions. The systems can operate with inert gases such as nitrogen or argon to protect reactive metal powders during processing.
Closed-loop powder handling
In industrial installations, air classifiers are often integrated into closed-loop processing circuits designed to maintain very low oxygen levels during powder handling. Separation limits can be adjusted without opening the system, allowing operators to optimise powder specifications while maintaining safe handling conditions. Gas-tight docking and sampling solutions support controlled quality monitoring throughout the process. This type of setup helps producers maintain stable powder properties and consistent feedstock quality for additive manufacturing applications.
