Process and apparatus for shape casting of particle...

C - Chemistry – Metallurgy – 22 – C

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C22C 1/08 (2006.01) B22D 25/00 (2006.01) B22D 27/00 (2006.01)

Patent

CA 2147377

Shaped articles are produced from foam metal by a procedure wherein the foam is formed by heating a composite of a metal matrix and finely divided solid stabilizer particles above the solidus temperature of the metal matrix and discharging gas bubbles into the molten metal composite below the surface thereof to thereby form a stabilized liquid foam on the surface of the molten metal composite. According to the novel feature the stabilized metal foam in liquid form is shape cast by being pressed into a mould and permitted to cool and solidify. The density of the cast part is essentially unchanged from that of the starting liquid foam.

Des articles formés sont produits à partir de métal en mousse au moyen d'une procédure selon laquelle la mousse est obtenue en chauffant un composite d'une matrice métallique et de particules solides stabilisantes, finement divisées, pour le porter au-dessus de la température dite << Solidus >> de la matrice métallique; des bulles de gaz sont ensuite introduites sous la surface du composite métallique en fusion pour former une mousse liquide stabilisée sur la surface du composite. Selon cette nouvelle particularité de l'invention, la mousse métallique stabilisée dans le liquide est moulée par pression dans un moule où elle refroidit et se solidifie. La densité de la pièce moulée demeure essentiellement inchangée par rapport à celle de la mousse liquide utliisée au début du processus.

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