Near liquidus injection molding process

B - Operations – Transporting – 22 – D

Patent

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B22D 17/00 (2006.01) B22D 25/00 (2006.01)

Patent

CA 2582687

An injection-molding process for molding a metal alloy into a near net shape article that is characterized in that the processing temperature of the alloy at injection is approaching the liquidus, preferably having a maximum solids content of 5%, whereby a net- shape molded article can be produced that has a homogeneous, fine equi-axed structure without directional dendrites, and a minimum of entrapped porosity. Advantageously, the resulting solid article has optimal mechanical properties without the expected porosity and solidification shrinkage attributed to castings made from super-heated melts. Also disclosed is a metal-matrix composite including a metallic component, and also including a reinforcement component embedded in the metallic component, the metallic component and the reinforcement component molded, at a near-liquidus temperature of the metallic component, by a molding machine.

L'invention porte sur un procédé de moulage par injection selon lequel un alliage métallique est moulé pour former un article d'une très grande précision dimensionnelle, ledit procédé se caractérisant en ce que la température de traitement de l'alliage à l'injection est proche de son liquidus, ayant de préférence une teneur maximale en solides de 5 % et selon lequel il est possible de produire un article moulé de très grande précision dimensionnelle, qui présente une structure homogène et isométrique fine exempte de dendrites directionnelles ainsi qu'une porosité piégée minimale. L'article solide obtenu présente l'avantage de posséder des propriétés mécaniques optimales sans la porosité prévue et sans le retrait de solidification propres aux produits moulés issus de coulées surchauffées. L'invention porte également sur un composite à matrice métallique comprenant un élément métallique ainsi qu'un élément de renfort noyé dans l'élément métallique, l'élément métallique et l'élément de renfort étant moulés à une température proche du liquidus de l'élément métallique au moyen d'une machine à mouler.

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