Preparation of mullite fiber
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Transparent mullite fibers have been prepared using aluminum carboxylates (ACs) and tetraethyl orthosilicate (TEOS) as starting materials, The ACs are derived from the catalyzed dissolution of elemental aluminum in a mixture of formic acid and acetic acid. The solubility of aluminum in the acids is influenced by the concentrations of the acids, mater, and additives and the preparation temperature. A 1:4:3:24 molar ratio of aluminum, formic acid, acetic acid, and mater dissolves the aluminum completely to give a colorless, clear solution suitable for fiber synthesis. The mixture of the ACs and TEOS, in the presence of ethyl alcohol as a mutual solvent at 50 degrees-60 degrees C, is concentrated to give a spinnable dope, from which mullite precursor fibers can be drawn, Heat treatment of the precursor at 1250 degrees C yields crystallized and transparent mullite fibers.
CitationJOURNAL OF THE AMERICAN CERAMIC SOCIETY，1996,79（6）：1494-1498