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J. Am. Cerum. SOC., 72 [5] 775-80 (1989) Processingof Boron Carbide-Aluminum Composites

Summary: J. Am. Cerum. SOC., 72 [5] 775-80 (1989)
Processingof Boron Carbide-Aluminum Composites
Danny C. Halverson*
Lawrence Livermore National Laboratoty, Universityof California, Livermore, California 94550
Aleksander J. Pyzik* and llhan A. Aksay*
Department of Materials Science and Engineering, Universityof Washington,
Seattle, Washington 98195
William E. Snowden*'*
Lawrence Livernore National Laboratoty, Universityof California, Livermore, California 94550
The processing problems associated with boron carbide and
the limitations of its mechanical properties can be signifi-
cantly reduced when a metal phase (e.g., aluminum) is
added. Lower densificationtemperaturesand higher fracture
toughness will result. Based on fundamental capillarity ther-
modynamics, reaction thermodynamics, and densificationki-
netics, we have established reliable criteria for fabricating
B4C-AI particulate composites. Because chemical reactions
cannot be eliminated, it is necessary to process B4C-AI by
rapidly heating to near 1200C (to ensure wetting) and subse-


Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University


Collections: Materials Science