Method and apparatus for casting aluminum by casting mold

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 27/18 (2006.01) B22C 3/00 (2006.01) B22D 21/00 (2006.01) B22D 21/04 (2006.01)

Patent

CA 2452404

A method for casting aluminum by a casting mold, which comprises the steps of filling a cavity with an inert gas, introducing gaseous magnesium into the cavity to precipitate a magnesium layer on the surface of the cavity, heating the surface of the cavity to a predetermined temperature, introducing a nitrogen gas into the cavity to form magnesium nitride on the surface of the magnesium layer, and supplying an aluminum melt into the cavity having the magnesium nitride formed to thereby produce an aluminum casting while reducing the surface of the aluminum melt with the magnesium nitride. The method allows the shortening of the time required for the formation of the magnesium nitride and the reduction of the consumption of nitrogen.

La présente invention concerne un procédé qui permet de couler de l'aluminium dans un moule, selon lequel on remplit une cavité (25) d'un gaz inerte, on introduit du magnésium gazeux dans la cavité afin de précipiter une couche de magnésium (58a) à la surface de la cavité, on chauffe la surface de la cavité à une température prédéterminée, on introduit de l'azote gazeux dans la cavité afin de former du nitrure de magnésium (58b) à la surface de la couche de magnésium, et on distribue de l'aluminium en fusion dans la cavité dans laquelle le nitrure de magnésium s'est formé afin de produire un moulage d'aluminium tout en réduisant la surface de l'aluminium en fusion (39) à l'aide du nitrure de magnésium. Le procédé de l'invention permet de raccourcir le temps nécessaire à la formation du nitrure de magnésium et de réduire la consommation d'azote.

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