Metal matrix composite and preform therefor

Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Coated or impregnated woven – knit – or nonwoven fabric which...

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428357, 428606, 428614, B32B 900

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active

056790414

ABSTRACT:
Heterogeneous metal matrix composite (MMC), and preform for making same. The MMC has two distinct interpenetrating metal-containing regions one of which is rich in reinforcement particles, and the other of which is devoid of reinforcement particles. The particle-free region pervades the composite in the form of a three-dimensional, open-cell reticulum of randomly oriented ligaments interconnecting a plurality of nodes and defining a plurality of interconnected interstitial cells of varying size. To make the MMC, a preform comprising an open cell foam substrate infiltrated with reinforcement particles is filled with the matrix metal. In one embodiment, the substrate is a fugitive polymer foam which is removed prior to filling the preform with metal. In another embodiment, the substrate is a metal foam which remains with the preform and the MMC after filling with metal.

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Howard H.D. Lee, "Validity of Using Mercury Porosimetry to Characterize the (1990).
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Fred F. Lange et al, "Method for Processing Metal-Reinforced Ceramic
Powell et al, U.S. Ser. No. 08/169,251 filed Dec. 20, 1993, "Reinforcement Preform, Method of Making Same and Reinforced Composite Made Therefrom".

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