A method for manufacturing castable metal matrix composite...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 1/10 (2006.01) C22B 21/00 (2006.01) C22B 21/06 (2006.01)

Patent

CA 2188253

The present invention relates to a novel method for forming cast metal matrix composite bodies. In particular, the present invention relates to a novel method for forming or recycling metal matrix composite bodies so as to render such bodies in a condition for casting or recasting as a cast metal matrix composite body. Specifically, a scrap metal matrix composite body and preferably a scrap cast metal matrix composite body is placed into a crucible, optionally along with unreinforced matrix metal and/or virgin metal matrix composite material. Whether the scrap and/or virgin materials are placed into the crucible in solid or molten form, the contents of the crucible are ultimately rendered molten to form a composite melt. A means for applying high shearing rates to the composite melt, such as an impeller rotating at high speed is immersed into the composite melt and the composite melt is sheared for a time sufficient to comminute any entrained inclusions such as entrapped oxide skins to a size at which such comminuted inclusions are substantially ameliorated in terms of their effect on the fluidity of the composite melt and the mechanical properties of the subsequent cast metal matrix composite bodies. Upon conclusion of the high intensity shearing process, the high power shearing apparatus is removed from the composite melt and the composite melt is cast using appropriate techniques for casting metal matrix composite material. .

L'invention concerne un nouveau procédé de formage de corps composites à matrice métallique coulée. Elle concerne, en particulier, un nouveau procédé de formage ou de recyclage de corps composites à matrice métallique afin de pouvoir les couler ou les recouler en tant que corps composite à matrice métallique coulée. On place un corps composite à matrice métallique coulée de rebut (3) dans un creuset (2), éventuellement avec un matériau composite à métal matriciel non renforcé et/ou à matrice métallique vierge. Indépendamment du fait que ces matériaux soient placés à l'état solide ou à l'état de fusion dans le creuset, on fait fondre le contenu du creuset, afin d'obtenir un mélange composite fondu. On immerge dans le bain de fusion composite un moyen (5) servant à appliquer à ce dernier une vitesse de cisaillement élevée, tel qu'une hélice tournant à vitesse rapide et le mélange est cisaillé pendant une durée permettant de désintégrer toutes inclusions entraînées, telles que des pellicules d'oxyde piégées, afin que lesdites inclusions n'exercent pas d'effets contraires à la fluidité du bain de fusion composite et aux propriétés mécaniques des corps composites à matrice métallique obtenus. Lorsque le processus de cisaillement est terminé, on retire le dispositif de cisaillement du bain de fusion composite et on coule ce dernier au moyen de techniques de coulage adéquates.

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