ISSN:
1573-4846
Keywords:
α-aluminum fiber
;
polycrystalline α-Al2O3-fiber
;
spinnable sol
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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 α-Al2O3 occurs at 1150° C.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00486302
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