Apparatus and process for casting metal matrix composite...

C - Chemistry – Metallurgy – 22 – C

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C22C 1/05 (2006.01) B22D 11/10 (2006.01) B22D 11/11 (2006.01) B22D 19/14 (2006.01)

Patent

CA 2086519

A composite material mixture (141) of free flowing reinforcement particles in a molten metal is solidified at a cooling rate greater than about 15 °C per second between the liquidus and solidus temperatures of the matrix alloy. This high cooling rate imparts a homogeneous structure to the solid composite material. Care is taken to avoid the introduction of gas bubbles (146) into the molten composite material while the mixture is stirred to prevent segregation of the particles. For viscous melts, an artificial surface layer such as a fiberglass blanket may be used to prevent entrapment of bubbles during precasting stirring. Additionally, gas bubbles are removed from the molten mixture by filtering (151) and skimming.

Mélange de matériau composite (141) renfermant des particules fluides de renfort dans un métal liquide solidifié à une vitesse de refroidissement supérieure à 15 degrés Celsius par seconde entre les températures dites << Liquidus >> et << Solidus >> de l'alliage de la matrice. La vitesse de refroidissement élevée confère une structure homogène au matériau composite solide. On veille à ne pas introduire de bulles de gaz (146) dans le matériau composite liquide pendant que le mélange est agité afin d'empêcher la ségrégation des particules. Pour les matériaux fondus visqueux, une couche de surface artificielle comme une toile de fibre de verre peut être utilisée afin d'éviter que des bulles soient emprisonnées pendant l'agitation précédant la coulée. De plus, les bulles de gaz sont éliminées du mélange liquide par filtration (151) et par écumage.

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