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Microstructure and Mechanical Properties of Reaction-Formed Silicon Carbide (RFSC) CeramicsThe microstructure and mechanical properties of reaction-formed silicon carbide (RFSC) ceramics fabricated by silicon infiltration of porous carbon preforms are discussed. The morphological characterization of the carbon preforms indicates a very narrow pore size distribution. Measurements of the preform density by physical methods and by mercury porosimetry agree very well and indicate that virtually all of the porosity in the preforms is open to infiltrating liquids. The average room temperature flexural strength of the RFSC material with approximately 8 at.% free silicon is 369 +/- 28 MPa (53.5 +/- 4 ksi). The Weibull strength distribution data give a characteristic strength value of 381 MPa (55 ksi) and a Weibull modulus of 14.3. The residual silicon content is lower and the strengths are superior to those of most commercially available reaction-bonded silicon carbide materials.
Document ID
19970024910
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Singh, M.
(NASA Lewis Research Center Cleveland, OH United States)
Behrendt, D. R.
(NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Materials Science and Engineering
Publisher: Elsevier Sequoia
Volume: A187
ISSN: 0921-5093
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-CR-203608
E-7989
NAS 1.26:203608
Accession Number
97N72243
Distribution Limits
Public
Copyright
Public Use Permitted.
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