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Cyclic Oxidation Resistance of a Reaction Milled Nial-AlN Composite

Published online by Cambridge University Press:  21 February 2011

Carl E. Lowell ,
Charles A. Barrett  and
J. Daniel Whittenberger
Carl E. Lowell
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
Charles A. Barrett
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
J. Daniel Whittenberger
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
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Abstract

Based upon recent mechanical property tests a NiAl-AlN composite produced by cryomilling has very attractive high temperature strength. This paper focuses on the oxidation resistance of the NiAl-AlN composite at 1473 and 1573 K as compared to that of Ni-47Al-0.15Zr, one of the most oxidation resistant intermetallics. The results of cyclic oxidation tests show that the NiAl-AlN composite has excellent properties although not quite as good as those of Ni-47Al-0.15Zr. The onset of failure of the NiAl-AlN was unique in that it was not accompanied by a change in scale composition from alumina to less protective oxides. Failure in the composite appears to be related to the entrapment of AlN particles within the alumina scale.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 355
Copyright
Copyright © Materials Research Society 1990

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References

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