Preparation of metal-matrix composite materials with high...

C - Chemistry – Metallurgy – 22 – C

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C22C 1/10 (2006.01) H01L 23/15 (2006.01) H01L 23/373 (2006.01)

Patent

CA 2339019

A composite material having less than about 25 volume percent refractory particles in a metal matrix is concentrated to have about 37-45 volume percent refractory particles. The concentrating is preferably accomplished by heating the composite material to melt the matrix, and then contacting the molten composite material to a porous element having an average pore size greater than that of the average particle size. A small pressure differential, on the order of about one atmosphere, is applied across the porous element, so that metal matrix material separates from the composite material and flows through the porous element. The particulate volume fraction in the composite material gradually increases. When the particulate volume fraction exceeds about 37 volume percent, the mass of composite material becomes semi-solid and freestanding. The resulting composite material may be further processed, as by forming to a useful shape or diluting with another matrix material.

L'invention porte sur un matériau composite présentant moins de 25 volume pour cent de particules dans une matrice métallique, concentré de manière à porter la concentration à environ 37-45 volume pour cent de particules réfractaires. La concentration s'obtient en chauffant le matériau composite pour faire fondre la matrice puis en mettant le matériau composite en contact avec un élément poreux dont la taille moyenne des pores dépasse celle des particules. Lorsqu'on applique un différentiel de pression de l'ordre d'une atmosphère à l'élément poreux, le matériau de la matrice du matériau composite se sépare du matériau composite et traverse l'élément poreux, ce qui fait croître graduellement la fraction volumique de particules dans le matériau composite. Lorsque la fraction volumique de particules atteint 37 volumes pour cent, la masse du matériau composite devient semi-solide et se rigidifie. Le matériau composite résultant peut être l'objet d'un traitement ultérieur notamment par formage pour lui conférer une forme utile, ou par dilution dans un autre matériau de matrice.

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