Preparation of transparent mullite-silica film by heat-treatment of imogolite

Natural gel-like imogolite was dispersed in an acetic acid aqueous solution. An imogolite film was prepared by evaporating the solvent from the imogolite solution and then subjecting it to heat-treatment. It transformed to an amorphous film at around 500 C and then to a mullite-silica composite film...

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Veröffentlicht in:	Journal of materials science 1992-01, Vol.27 (22), p.6193-6196
Hauptverfasser:	DONKAI, N, MIYAMOTO, T, KOKUBO, T, TANEI, H
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Building materials. Ceramics. Glasses Ceramic industries Chemical industry and chemicals Exact sciences and technology Miscellaneous Technical ceramics
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	Natural gel-like imogolite was dispersed in an acetic acid aqueous solution. An imogolite film was prepared by evaporating the solvent from the imogolite solution and then subjecting it to heat-treatment. It transformed to an amorphous film at around 500 C and then to a mullite-silica composite film at around 1000 C without showing pores and cracks. The film heat treated to 1200 C showed high transparency as well as a low thermal expansion coefficient of about 4 x 10 exp(-6). 10 refs.
ISSN:	0022-2461 1573-4803
DOI:	10.1007/BF01133770