A new way to spinnable sols derived from modified aluminumalkoxides |
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Authors: | W Glaubitt D Sporn R Jahn |
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Institution: | (1) Fraunhofer Institut für Silicatforschung, Neunerplatz 2, D-97082 Würzburg, Germany |
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Abstract: | The preparation of spinnable sols has been developed to obtain a new type of sol-gel derived pure alumina fiber. The starting material was aluminum sec-butoxide, which was modified in a first step with glycolether, e.g., isopropoxyethanol. This leads to a partial replacement of alkoxy groups via alcoholysis and a change of the precursor structure from a trimeric to a tetrameric one. In the second step, carboxylation, the transformation to six-coordinated aluminum could be observed. Due to the formation of a sol with Newtonian flow behavior after hydrolysis, gel fibers up to several kilometers long could be drawn directly from the clear colorless sol with spinning velocities up to 200 m/min. The addition of an organic filament-forming polymer is not necessary. The sol is spinnable for periods up to one year. The transformation of the gel fiber to -Al2O3 occurs at 1150° C. |
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Keywords: | -aluminum fiber" target="_blank">gif" alt="agr" align="BASELINE" BORDER="0">-aluminum fiber polycrystalline -Al2O3-fiber" target="_blank">gif" alt="agr" align="BASELINE" BORDER="0">-Al2O3-fiber spinnable sol |
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