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Mullite Precursor Part I. Characterization of Mullite Precursor Formed by a Reaction of Monosilicic Acid on Aluminum Hydroxide

Published online by Cambridge University Press:  26 July 2012

Takushi Yokoyama ,
Keisuki Nishu ,
Shunsuke Torii ,
Yoshio Ikeda  and
Tokuko Watanabe
Takushi Yokoyama
Affiliation:
Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-81, Japan
Keisuki Nishu
Affiliation:
Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-81, Japan
Shunsuke Torii
Affiliation:
Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-81, Japan
Yoshio Ikeda
Affiliation:
Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-81, Japan
Tokuko Watanabe
Affiliation:
Laboratory of Marine Biochemistry, Department of Food Science and Technology, Tokyo University of Fisheries, Konan, Minato-ku, Tokyo 108, Japan
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Abstract

By adsorption of monosilicic acid on aluminum hydroxide, an amorphous aluminosilicate (AAS) of Si/Al ratio of 1/3 was formed. When the AAS was heated to 1000 °C, mullite (3Al2O3 · 2SiO2) crystallized directly without the formation of a spinel phase. It was clearly evidenced that correct adjustment of three factors, the Si/Al ratio, the proportion of 4- and 6-coordinated aluminums, and the single environment of a unit (no Si–O–Si bond), is important for the direct mullitization from AAS.

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Articles
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Journal of Materials Research , Volume 12 , Issue 8 , August 1997 , pp. 2111 - 2116
Copyright
Copyright © Materials Research Society 1997

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