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Summary: ,., .. ,_..I ..:<.>7!.:,,;&..-&::
J. Am. Ceram.Soc., 78 [21 479-86 (1995)
Processing of Silicon Carbide-Mullite-Alumina Nanocomposites
Yoshio Sakka*
National Research Institute for Metals, 2-1, Sengen-1,Tsukuba, Ibaraki 305,Japan
Donald D. Bidinger* and Ilhan A. &say*
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544-5263
Nanocomposite materials in the form of nanometer-sized
second-phase particles dispersed in a ceramic matrix have
been shown to display enhanced mechanical properties. In
spite of this potential, processing methodologies to produce
these nanocomposites are not well established. In this paper,
we describe a new method for processing SiC-mullite-
Al,O, nanocomposites by the reaction sintering of green
compacts prepared by colloidal consolidation of a mixture
of SIC and A1,0, powders. In this method, the surface of the
Sic particles was first oxidized to produce silicon oxide and
to reduce the core of the SIC particles to nanometer size.
Next, the surface silicon oxide was reacted with alumina to


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


Collections: Materials Science