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Journal of Materials Science

, Volume 29, Issue 17, pp 4559–4566 | Cite as

Sol/gel-based precursors for manufacturing refractory oxide fibres

  • G. Emig
  • R. Wirth
  • R. Zimmermann-Chopin
Papers

Abstract

Several kinds of mixed refractory oxide fibres containing the oxides of Zr, Ti, Al, Cr and Ce were produced from sol/gel precursors via a melt spinning process from 50 to 110°C. For the synthesis of precursor sols the n-propoxides of Zr and Ti were reacted with chelating agents acetylacetone, ethyleneglycole, acetic acid and hydrolysis water. The surplus of solvents was distilled off, to adjust the viscosity. The viscosity and spinnability were improved by the use of N,N-dimethylformamide (DMF) as drying control chemical additive (DCCA) and different organic polymers as plastifiers. The elements Al, Cr and Ce were added to the precursor sols as chlorides, basic chlorides or basic acetates. The precursors were spun into bundles of thin gel-fibres with minimum diameters of ca. 45 μm by extrusion though multifilament spinnerets. The gel fibres were cured in air at 105°C and converted into fine grained ceramic fibres by pyrolysis at 1450°C. The decomposition process was investigated by thermogravimetric measurements (TG/DTA) and thermomechanical analysis (TMA).

Keywords

Viscosity Pyrolysis Decomposition Process Acetylacetone Control Chemical 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • G. Emig
    • 1
  • R. Wirth
    • 2
  • R. Zimmermann-Chopin
    • 3
  1. 1.Institut für Technische Chemie IUniversität ErlangenErlangenGermany
  2. 2.Institut für Chemische TechnikUniversität Karlsruhe (TH)Karlsruhe 1Germany
  3. 3.Kernforschungszentrum KarlsruheInstitut für Materialforschung IIIKarlsruhe 1Germany

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