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The effect of delta T /oxidizing temperature minus cooling temperature/ on oxide spallationSeveral alloys (one iron base and five nickel base) were cyclically oxidized in a series of tests in which the higher temperature (1100 or 1200 C) of the cycle was fixed at a level to allow ample oxidation in reasonable time and the lower temperature was variable to allow cycle temperature differences of up to 1400 C. For all nickel alloys, as delta T increased the extent of spallation increased. This effect was attributed to thermal expansion mismatches between the oxide and the nickel substrate. The FeCrAl alloy was not sensitive to delta T and resisted spalling at delta T levels to 1400 C. FeCrAl, and the Al2O3 scale which forms on it, have thermal expansion coefficients which are substantially more alike than any of the other oxide-metal combinations tested.
Document ID
19770053247
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Deadmore, D. L.
(NASA Lewis Research Center Cleveland, OH, United States)
Lowell, C. E.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1977
Publication Information
Publication: Oxidation of Metals
Volume: 11
Subject Category
Metallic Materials
Accession Number
77A36099
Distribution Limits
Public
Copyright
Other

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