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Polymer-Derived Si3N4/BN Composites

Published online by Cambridge University Press:  21 February 2011

Wayde R. Schmidt,
William J. Hurley Jr.,
Vijay Sukumar,
Robert H. Doremus and
Leonard V. Interrante
Wayde R. Schmidt
Affiliation:
Departments of Materials Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
William J. Hurley Jr.
Affiliation:
Departments of Materials Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Vijay Sukumar
Affiliation:
Departments of Materials Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Robert H. Doremus
Affiliation:
Departments of Materials Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Leonard V. Interrante
Affiliation:
Departments ofChemistry, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
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Abstract

Partially crystalline silicon nitride, with a specific surface area greater than 200 m2/g, is obtained by the pyrolysis of an organometallic, polymeric precursor under NH3 to 1000 °C. Additional heating to 1400 °C under N2 produces alpha-Si3N4. The addition of up to 15% h-BN was found to affect the coarsening characteristics of amorphous silicon nitride by promoting surface area reduction and suppressing crystallinity. By combining Si3N4 and BN molecular and polymeric precursors prior to ceramic conversion, or incorporating Si, N, and B into a single preceramic polymer, the relative proportion and crystallinity of the ceramic phases can be controlled in the resulting Si3N4/BN composites.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 171: Symposium O – Polymer Based Molecular Composites , 1989, 79
Copyright
Copyright © Materials Research Society 1990

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References

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