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Oxidation stability of advanced reaction-bonded Si3N4 materialsFour slip-cast, injection-molded and isostatically-pressed specimens of reaction-bonded silicon nitride (RBSN) were subjected to static oxidation tests at 900 C for 10 hours. Specimens containing 8-10% interconnected open porosity of size greater than one micron exhibited a 20-30% decrease in average room temperature four-point flexure strength, while those with 10% open porosity of magnitudes much smaller than one micron as well as those with 2-4% interconnected open porosity of about one micron did not decrease in strength after 900 C exposure. It was determined that preoxidation treatment at 1350 C prevents the 20-30% strength degradation due to internal oxidation, and evidence is presented which suggests that surface pit formation in some RBSN may result from contamination by the furnace environment rather than any intrinsic material properties.
Document ID
19820049495
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lindberg, L. J.
(Garrett Turbine Engine Co. Phoenix, AZ, United States)
Richerson, D. W.
(Garrett Turbine Engine Co. Phoenix, AZ, United States)
Carruthers, W. D.
(Garrett Turbine Engine Co. Phoenix, AZ, United States)
Gersch, H. M.
(AiResearch Casting Co. Torrance, CA, United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1982
Subject Category
Nonmetallic Materials
Report/Patent Number
ACS PAPER 52-B-80P
Accession Number
82A33030
Funding Number(s)
CONTRACT_GRANT: F33615-77-C-5171
CONTRACT_GRANT: DEN3-167
CONTRACT_GRANT: N00024-76-C-5352
Distribution Limits
Public
Copyright
Other

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