Boron carbide-aluminum cermets having microstructures tailored b

Details Boron carbide-aluminum cermets having microstructures tailored b Boron carbide-aluminum cermets having microstructures tailored b

1992-10-13

1994-03-29

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 93, 501 96, 419 15, 419 29, 419 45, 419 54, C04B 3556

Patent

active

052984680

ABSTRACT:
Densified boron carbide-aluminum, ceramic-metal composites that are substantially free of AlB.sub.12, AlB.sub.12 C.sub.2 and Al.sub.4 C.sub.3 result from a two stage process. Admixtures of boron carbide are densified under pressure in stage one, In stage two, the densified admixture is heat treated. In both stages, the temperature is less than 800.degree. C. If the temperatures do not exceed 600.degree. C., the resultant densified cermet has only three phases: a) boron carbide; b) Al.sub.4 BC; and c) aluminum.

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patent: 4744943 (1988-05-01), Timm
patent: 4861778 (1990-10-01), Pyzik et al.
patent: 5039633 (1991-08-01), Pyzik et al.

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