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Mechanical behavior 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
19910013998
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Salem, Jonathan A.
(NASA Lewis Research Center Cleveland, OH., United States)
Choi, Sung R.
(NASA Lewis Research Center Cleveland, OH., United States)
Freedman, Marc R.
(NASA Lewis Research Center Cleveland, OH., United States)
Jenkins, Michael G.
(Oak Ridge National Lab. TN., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-TM-103741
E-5983
NAS 1.15:103741
Meeting Information
Meeting: Annual Pacific Coast Meeting
Location: Seattle, WA
Country: United States
Start Date: October 25, 1990
End Date: October 27, 1990
Sponsors: American Ceramic Society
Accession Number
91N23311
Funding Number(s)
PROJECT: RTOP 505-63-1M
CONTRACT_GRANT: DE-AI05-870R-21749
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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