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Silicon Nitride Ceramic Matrix for CMCs from Silane Derived Si Powders and Preceramic Polymers

Published online by Cambridge University Press:  15 February 2011

Wendell E. Rhine ,
Annamarie Lightfoot ,
Dietmar Seyferth  and
John S. Haggerty
Wendell E. Rhine
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
Annamarie Lightfoot
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
Dietmar Seyferth
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
John S. Haggerty
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Si powders synthesized by the laser pyrolysis of silane can be nitrided at 1200–1250°C, producing an improved reaction bonded silicon nitride. This RBSN is a potential matrix for composites since it can be formed at temperatures which do not degrade the strengths of commercially available amorphous ceramic fibers. However, the density of the RBSN matrix has been limited to about 75% using the silane-derived Si powder. Combining Si powders and preceramic polymers offers an approach for increasing the density and mechanical properties of the reaction-formed Si3N4 matrix. The incorporation of polysilazanes inhibited the nitridation at 1250°C, but samples could be effectively nitrided at 1400°C. These higher nitriding temperatures are compatible with SCS-6 and other lowoxygen, crystalline SiC fibers which can be used as reinforcements for ceramic composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 101
Copyright
Copyright © Materials Research Society 1995

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