Boron-carbide-aluminum and boron-carbide-reactive- metal...

Details Boron-carbide-aluminum and boron-carbide-reactive- metal... Boron-carbide-aluminum and boron-carbide-reactive- metal...

C - Chemistry, Metallurgy

22

C

75/1.2

C22C 29/06 (2006.01) C04B 35/563 (2006.01) C04B 35/65 (2006.01) C22C 1/00 (2006.01) C22C 1/05 (2006.01) C22C 29/00 (2006.01) C22C 29/14 (2006.01)

Patent

CA 1273229

ABSTRACT OF THE DISCLOSURE Hard, tough, lightweight boron-carbide-reactive metal composites, particularly boron-carbide-aluminum composites, are produced. These composites have compositions with a plurality of phases. A method is provided, including the steps of wetting and reacting the starting materials, by which the microstructures in the resulting composites can be controllably selected. Starting compositions, reaction temperatures, reaction times, and reaction atmospheres are parameters for controlling the process and resulting compositions. The ceramic phases are homogeneously distributed in the metal phases and adhesive forces at ceramic-metal interfaces are maximized. An initial consolidation step is used to achieve fully dense composites. Microstructures of boron-carbide-aluminum cermets have been produced with modulus of rupture exceeding 110 ksi and fracture toughness exceeding 12 ksi/in. These composites and methods can be used to form a variety of structural elements.

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