Powder storage, handling and recycling conditions
To minimise particles contact with atmosphere, Storage conditions have to be optimised to minimise oxidation for moisture pick up: storage under inert atmosphere or vacuum should be encouraged. In addition, closed loop recycling systems minimise contact with atmosphere.
When storage under inert atmosphere is not practical (i.e. for large powder quantities), three methods can reduce moisture contents .
External powder drying
Internal powder drying – single layer drying
- minimising oxidation and moisture pick up during handling, processing, storage and recycling;
- internal (low power layer scan) and external (furnace) powder drying;
- and by modifying process parameters to include layer remelting using two successive high power scans.
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