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Author Chen, Y. F. ♦ Vilminot, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ MULLITE ♦ SOL-GEL PROCESS ♦ PRECURSOR ♦ X-RAY DIFFRACTION ♦ REACTION KINETICS ♦ DIFFERENTIAL THERMAL ANALYSIS ♦ BULK DENSITY
Abstract Using tetraethyl orthosilicate and aluminum tri-sec-butoxide as raw materials, two series of mullite gels were prepared, one involving a chemical modification of aluminum alkoxide by ethylacetoacetate, the other one by reacting both alkoxides in a non-homologous alcohol, i.e., isopropyl alcohol or 2-methoxyethanol. For the first route, the excess water or basic conditions promote the formation of nanosized powders that appear X-ray amorphous after the crystallization exotherm on the DTA trace. The same result is obtained for the second route with isopropanol as solvent. The sample preparation strongly influences the ceramic densifications that can vary from 70 to 93 % of the theoretical value after 1,200 C calcination.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-03-01
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 30
Issue Number 3


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