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The Influence of Precursor Structure on the Development of Porosity in Polymer-Derived Sic

Published online by Cambridge University Press:  10 February 2011

J. F. Nebo ,
C. S. Scotto ,
C. A. Bennett  and
C. J. Brinker
J. F. Nebo
Affiliation:
Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131
C. S. Scotto
Affiliation:
Sandia National Laboratories, Advanced Materials Laboratory, 1001 University Blvd., Albuquerque, NM 87106 Current Address: Naval Research Lab, Washington D.C. 20375-5338.
C. A. Bennett
Affiliation:
Department of Chemical Engineering, University of Toledo, Toledo, OH 43606.
C. J. Brinker
Affiliation:
Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131 Sandia National Laboratories, Advanced Materials Laboratory, 1001 University Blvd., Albuquerque, NM 87106
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Abstract

Polymer-based routes to ceramic oxides take advantage of precursor chemistry and structure to produce materials with a range of pore sizes. Polymer precursor routes to nonoxide ceramics offer products with superior thermal and chemical stability in many cases. Polymethylsilane (PMS), a versatile cross linked SiC precursor, [(MeHSi)x(MeSi)y], was synthesized using published procedures to yield fluid precursors with a low (20–40%) degree of cross linking. Unique, highly cross linked (60–70%), solid polymers were produced under reaction conditions which carefully conserve the volatile monomer. These two polymers were converted to SiC to determine the relative importance of the various contributions to porosity, and to assess the role of precursor structure on porosity development in non-oxides. Initial results indicate that precursor structure has little effect on porosity. The development of the porosity appears to be dominated by high temperature thermochemistry and/or microstructural changes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 431: Symposium P – Microporous and Macroporous Materials , 1996 , 409
Copyright
Copyright © Materials Research Society 1996

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