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Improved toughness of silicon carbideSeveral techniques were employed to apply or otherwise form porous layers of various materials on the surface of hot-pressed silicon carbide ceramic. From mechanical properties measurements and studies, it was concluded that although porous layers could be applied to the silicon carbide ceramic, sufficient damage was done to the silicon carbide surface by the processing required so as to drastically reduce its mechanical strength. It was further concluded that there was little promise of success in forming an effective energy absorbing layer on the surface of already densified silicon carbide ceramic that would have the mechanical strength of the untreated or unsurfaced material. Using a process for the pressureless sintering of silicon carbide powders it was discovered that porous layers of silicon carbide could be formed on a dense, strong silicon carbide substrate in a single consolidation process.
Document ID
19760007182
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Palm, J. A. (General Electric Co. Schenectady, NY, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1975
Subject Category
Nonmetallic Materials
Report/Patent Number
SRD-75-123
NASA-CR-134921
Accession Number
76N14270
Funding Number(s)
CONTRACT_GRANT: NAS3-17767
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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