Degassing of molten metal under vacuum. Induction is used to melt and stir the metal. The molten metal is refined under vacuum to remove impurities until the precise melt chemistry is achieved.
The VIM process is used to produce e.g., stainless steels, superalloys, magnetic or battery alloys.
Specific challenges for the vacuum system:
- Metal- and metal oxide dust entering the vacuum system (potentially pyrophoric)
- High gas inlet temperatures
- Low process pressure requirement down to 10-4 mbar, depending on the alloy