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Oxidation of Al2O3 continuous fiber-reinforced/NiAl compositesThe 1200 C and 1300 C isothermal and cyclic oxidation behavior of Al2O3 continuous fiber-reinforced/NiAl composites were studied. Oxidation resulted in formation of Al2O3 external scales in a similar manner as scales formed on monolithic NiAl. The isothermal oxidation of an Al2O3/NiAl composite resulted in oxidation of the matrix along the fiber/matrix interface near the fiber ends. This oxide acted as a wedge between the fiber and the matrix, and, under cyclic oxidation conditions, led to further oxidation along the fiber lengths and eventual cracking of the composite. The oxidation behavior of composites in which the Al2O3 fibers were sputter coated with nickel prior to processing was much more severe. This was attributed to open channels around the fibers which formed during processing, most likely as a result of the diffusion of the nickel coating into the matrix.
Document ID
19920074405
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Doychak, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Nesbitt, J. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Noebe, R. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Bowman, R. R.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
August 1, 1992
Publication Information
Publication: Oxidation of Metals
Volume: 38
Issue: 1-2,
ISSN: 0030-770X
Subject Category
Composite Materials
Accession Number
92A57029
Distribution Limits
Public
Copyright
Other

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