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Pest Resistant and Low CTE MoSi2-Matrix for High Temperature Structural Applications

Published online by Cambridge University Press:  15 February 2011

M. G. Hebsur
M. G. Hebsur*
Affiliation:
NYMA Inc., NASA-LeRC Group, Brookpark. OH 44142
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Abstract

The objective of this investigation was to identify a pest resistant MoSi2-base matrix composition having properties suitable for SiC reinforcement. A 30 vol.% addition of fine Si3N4 particulates to MoSi2 significantly improved the low temperature accelerated oxidation resistance and thereby eliminated pest failure. Addition of Si3N4 also improved the high temperature oxidation resistance, strength and more importantly lowered the CTE of MoSi2 such that cracking was eliminated in a hybrid composite consisting of 30 vol.% Si3N4 and 30 vol. % SCS-6 fibers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 177
Copyright
Copyright © Materials Research Society 1994

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