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Oxidation Protection of Porous Reaction-Bonded Silicon NitrideOxidation kinetics of both as-fabricated and coated reaction-bonded silicon nitride (RBSN) were studied at 900 and 1000 C with thermogravimetry. Uncoated RBSN exhibited internal oxidation and parabolic kinetics. An amorphous Si-C-O coating provided the greatest degree of protection to oxygen, with a small linear weight loss observed. Linear weight gains were measured on samples with an amorphous Si-N-C coating. Chemically vapor deposited (CVD) Si3N4 coated RBSN exhibited parabolic kinetics, and the coating cracked severely. A continuous-SiC-fiber-reinforced RBSN composite was also coated with the Si-C-O material, but no substantial oxidation protection was observed.
Document ID
19980153162
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1007/BF00349966
Authors
Fox, D. S. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 18, 2013
Publication Date
November 1, 1994
Publication Information
Publication: Journal of Materials Science
Volume: 29
Issue: 21
ISSN: 0022-2461
Subject Category
Nonmetallic Materials
Report/Patent Number
E-9350
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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