PROCEDE DE FABRICATION D'UNE PIECE COMPOSITE A MATRICE MAGNESIUM, PAR FONDERIE SOUS PRESSION

摘要

The invention concerns a method for making a composite part with magnesium matrix by infiltration casting consisting in the following steps: placing in a container (10) a mould (32) provided with a supply tube (36) in its lower part and in which a fibrous preform (34) has been housed. A melting pot (26) containing magnesium blocks (28) is placed beneath the mould (32). The magnesium is heated and the mould is preheated under vacuum until the magnesium starts to melt. The tube (36) is then introduced in the magnesium and neutral gas is circulated in the container, at a vacuum level that is insufficient to cause the magnesium to evaporate. When the magnesium has completely melted, it is transferred into the mould by quick pressurising of the container. The mould is then cooled, and the part is removed therefrom.