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Mechanical behaviour and failure phenomenon of an in situ toughened silicon nitrideThe Weibull modulus, fracture toughness and crack growth resistance of an in-situ toughened, silicon nitride material used to manufacture a turbine combustor were determined from room temperature to 1371 C. The material exhibited an elongated grain structure that resulted in improved fracture toughness, nonlinear crack growth resistance, and good elevated temperature strength. However, low temperature strength was limited by grains of excessive length (30 to 100 microns). These excessively long grains were surrounded by regions rich in sintering additives.
Document ID
19920071880
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Salem, J. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Choi, S. R.
(NASA Lewis Research Center Cleveland, OH, United States)
Freedman, M. R.
(NASA Lewis Research Center Cleveland, OH, United States)
Jenkins, M. G.
(Oak Ridge National Laboratory TN, United States)
Date Acquired
August 15, 2013
Publication Date
August 15, 1992
Publication Information
Publication: Journal of Materials Science
Volume: 27
Issue: 16 A
ISSN: 0022-2461
Subject Category
Nonmetallic Materials
Accession Number
92A54504
Funding Number(s)
CONTRACT_GRANT: DE-AI05-87OR-21749
Distribution Limits
Public
Copyright
Other

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