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Microcrystalline Ceramic Composites by Active Filler Controlled Reaction Pyrolysis of Polymers

Published online by Cambridge University Press:  15 February 2011

Peter Greil ,
Michael Seibold  and
Tobias Erny
Peter Greil
Affiliation:
Technical University of Hamburg-Harburg, Advanced Ceramics Group, Denickestr. 15, 2100 Hamburg 90, Germany
Michael Seibold
Affiliation:
Technical University of Hamburg-Harburg, Advanced Ceramics Group, Denickestr. 15, 2100 Hamburg 90, Germany
Tobias Erny
Affiliation:
Technical University of Hamburg-Harburg, Advanced Ceramics Group, Denickestr. 15, 2100 Hamburg 90, Germany
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Abstract

Pyrolytic conversion of preceramic polymers such as polysilanes, -silazanes, or -siloxanes to ceramics may be significantly influenced by the resence of active filler dispersoids. Based on thermodynamic and microstructural considerations a variety of suitable polymer-filler systems can be found which allow the fabrication of microcrystalline composite materials with low dimensional change upon polymer- ceramic conversion. As an example the active filler controlled reaction pyrolysis of polysiloxane with addition of titanium powder was investigated. A composite material with microcrystalline titanium carbide inclusions embedded in an amorphous (< 1000 °C) or nanocrystalline (>1000 °C) silicon oxycarbide matrix was formed. Property changes with increasing pyrolysis temperature can be attributed to various microstructural transformations. Thus, a variety of potential fillers may be used to tailor the microstructure of polymer-derived ceramic composite materials in order to fabricate bulk materials and components with a broad range of compositions and properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 274: Symposium R – Submicron Multiphase Materials , 1992 , 155
Copyright
Copyright © Materials Research Society 1992

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References

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