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Microstructural characterization of a SiC Whisker-Reinforced HIPped Reaction-Bonded Si3N4

Published online by Cambridge University Press:  22 February 2011

S. C. Farmer ,
P. Pirouz  and
A. H. Heuer
S. C. Farmer
Affiliation:
Department of Material Science and Eng. Case Western Reserve University Cleveland, Ohio 44106
P. Pirouz
Affiliation:
Department of Material Science and Eng. Case Western Reserve University Cleveland, Ohio 44106
A. H. Heuer
Affiliation:
Department of Material Science and Eng. Case Western Reserve University Cleveland, Ohio 44106
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Abstract

A SiC whisker reinforced HIPped RBSN material fabricated with a Y2O3 sintering aid was characterized using TEM. The matrix is > 90% β-Si3 N4 with a Y-Si-O-N glassy phase at the Si3 N4 grain boundaries and about the SiC whiskers. The SiC whisiers are heavily faulted and have a well defined core. Si3 N4 precipitates are observed in the core region after composite fabrication. A preliminary mechanism for the growth of the SiC whisker, based on the VLS mechanism is proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 169
Copyright
Copyright © Materials Research Society 1988

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