Chemical Treatment of Aluminium Alloy Powder Surfaces

摘要

In aluminum alloy powder metallurgy, surface oxides on powder particles act asobstacles to consolidation. These oxides are practically inevitable and degassing in vacuum is applied prior to compaction in order to facilitate consolidation. As an alternative, degassing powders were treated with chemical solutions, dried and extruded. During chemical treatment, the oxide skin on powder particles is completely or partially dissolved and new oxides with improved properties are formed. Consolidation of powders is facilitated and fracture toughness of extrudes is increased.