Patent ID: 7201209
Filing Date: 2007-04-10
Classification: B22C,B22D

Abstract:
1. An aluminum casting process using a casting mold, comprising the steps of: prior to introducing gaseous magnesium, filling a cavity of a closed mold with a rare gas that is unreactive with magnesium; introducing gaseous magnesium into the rare gas-filled cavity and thereby depositing unreacted magnesium on a wall of the cavity; heating the mold to heat the unreacted magnesium-deposited cavity wall to a specific temperature, said specific temperature being greater than or equal to 400° C.; after heating the mold to the specified temperature, introducing nitrogen gas into the cavity, said nitrogen gas reacting with said unreacted magnesium on the cavity wall and thereby forming a magnesium nitride coating on the cavity wall; and supplying molten aluminum into the cavity in which the magnesium nitride coating has been formed, to mold an aluminum casting in the cavity, while reducing a surface of the molten aluminum with the magnesium nitride.