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Journal of Materials Science

, Volume 26, Issue 5, pp 1247–1252 | Cite as

Silsesquioxane-derived ceramic fibres

  • F. I. Hurwitz
  • S. C. Farmer
  • F. M. Terepka
  • T. A. Leonhardt
Papers

Abstract

Fibres formed from blends of silsesquioxane polymers were characterized to study the pyrolytic conversion of these precursors to ceramics. The morphology of fibres pyrolysed to 1400°C revealed primarily amorphous glasses whose conversion to β-SiC is a function of both blend composition and pyrolysis conditions. Formation of β-SiC crystallites within the glassy phase is favoured by higher than stoichiometric C/Si ratios, while carbothermal reduction of Si-O bonds to form SiC with loss of SiO and CO occurs at higher methyl/phenylpropyl silsesquioxane (lower C/Si) ratios. As the carbothermal reduction is assumed to be diffusion controlled, the fibres can serve as model systems to gain understanding of the silsesquioxane pyrolysis behaviour, and therefore are useful in the development of polysilsequioxane-derived ceramic matrices and coatings as well.

Keywords

Polymer Pyrolysis Glassy Phase Carbothermal Reduction Ceramic Fibre 
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 and Hall Ltd. 1991

Authors and Affiliations

  • F. I. Hurwitz
    • 1
  • S. C. Farmer
    • 1
  • F. M. Terepka
    • 1
  • T. A. Leonhardt
    • 2
  1. 1.NASA Lewis Research CenterClevelandUSA
  2. 2.Sverdrup Technology Inc.ClevelandUSA

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