aluminum casting mold

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 gasthat 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 specifictemperature, 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 cavitywall 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 themolten aluminum with the magnesium nitride.

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