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Mullite (3Al2O3-2SiO2) Synthesis with Aluminosiloxanes D. R. Treadwell,, D. M. Dabbs, and I. A. Aksay*,

Summary: Mullite (3Al2O3-2SiO2) Synthesis with Aluminosiloxanes
D. R. Treadwell,, D. M. Dabbs, and I. A. Aksay*,
Department of Materials Science and Engineering and Washington Technology Center,
University of Washington, Seattle, Washington 98195, and Department of Chemical
Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544-5263
Received February 8, 1996. Revised Manuscript Received June 26, 1996X
High-yield mullite (3Al2O3-2SiO2) precursors consist of aluminosiloxanes synthesized from
mixtures of aluminum and silicon alkoxides. Atomic level mixing of the aluminum and silicon
oxides is demonstrated by the low-temperature conversion (<1000 C) of the aluminosiloxanes
to phase-pure mullite. The proper selection of monomeric side groups serves several
functions: (i) controlling reactivity of the silicon and aluminum monomers, thereby favoring
atomic-level mixing; (ii) maintaining the tractability of the resulting aluminosiloxane; (iii)
improving the yield during mullitization of the aluminosiloxane through easy thermolytic
removal. The tractability of the aluminosiloxane compounds permits these materials to be
used in fiber spinning, the casting of thin films and monoliths, and as impregnants to powder
Interest in mullite (3Al2O3-2SiO2) spans a wide range
of technologies due to its unique thermal, chemical,


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


Collections: Materials Science