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Processing and properties of SiC whisker- and particulate-reinforced reaction bonded Si3N4The microstructure and mechanical properties of reaction bonded Si3N4 (RBSN) reinforced with SiC whiskers of particles were investigated using RBSN composites made from colloidally pressed octanol dispersions of high-purity Si powders mixed with either SiC whiskers or alpha-SiC particles. Results of investigations, revealing high conversions of Si to Si3N4, specific surface areas, and constant relative densities and strengths, showed that the uniform microstructure and small flaw size of the matrix were maintained in the composites and that no degradation of the reinforcements was taking place. Neither the monolithic nor the composite materials exhibited R-curve behavior. A modest increase in fracture toughness was observed only in the RBSN containing 33 vol pct SiC(p).
Document ID
19910072298
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lightfoot, A.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Ewart, L.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Haggerty, J.
(MIT Cambridge, MA, United States)
Cai, Z. Q.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Ritter, J.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Nair, S.
(Massachusetts, University Amherst, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Ceramic Engineering and Science Proceedings
Volume: 12
ISSN: 0196-6219
Subject Category
Composite Materials
Accession Number
91A56921
Funding Number(s)
CONTRACT_GRANT: DE-FG02-87ER-45313
CONTRACT_GRANT: DAAL03-88-K-0099
CONTRACT_GRANT: NAG3-845
Distribution Limits
Public
Copyright
Other

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