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Oxidation effects on the mechanical properties of a SiC-fiber-reinforced reaction-bonded Si3N4 matrix compositeThe room-temperature mechanical properties of SiC fiber reinforced reaction bonded silicon nitride composites were measured after 100 hrs exposure at temperatures to 1400 C in nitrogen and oxygen environments. The composites consisted of approx. 30 vol percent uniaxially aligned 142 micron diameter SiC fibers in a reaction bonded Si3N4 matrix. The results indicate that composites heat treated in a nitrogen environment at temperatures to 1400 C showed deformation and fracture behavior equivalent to that of the as-fabricated composites. Also, the composites heat treated in an oxidizing environment beyond 400 C yielded significantly lower tensile strength values. Specifically in the temperature range from 600 to 1000 C, composites retained approx. 40 percent of their as-fabricated strength, and those heat treated in the temperatures from 1200 to 1400 C retained 70 percent. Nonetheless, for all oxygen heat treatment conditions, composite specimens displayed strain capability beyond the matrix fracture stress; a typical behavior of a tough composite.
Document ID
19920042821
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bhatt, Ramakrishna T.
(NASA Lewis Research Center; U.S. Army, Propulsion Laboratory, Cleveland OH, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1992
Publication Information
Publication: American Ceramic Society, Journal
Volume: 75
ISSN: 0002-7820
Subject Category
Composite Materials
Accession Number
92A25445
Distribution Limits
Public
Copyright
Other

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