Effect of nitrogen on the formation and oxidation behavior of iron aluminide coatings

Y. Zhang; B. A. Pint; K. M. Cooley; J. A. Haynes

doi:10.1016/j.surfcoat.2005.07.081

Effect of nitrogen on the formation and oxidation behavior of iron aluminide coatings

Y. Zhang, B. A. Pint, K. M. Cooley, J. A. Haynes

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40 Scopus citations

Abstract

The present study focused on the effect of N in ferritic Fe-9Cr-1Mo and austenitic 304 L alloy substrates on the formation and cyclic oxidation behavior of aluminide coatings fabricated by chemical vapor deposition (CVD). Relatively high N contents in the commercial alloys caused the formation of AlN precipitates in the CVD aluminide coating, which adversely affected the adhesion of the as-deposited coatings, particularly on 304 L. The reduction of N content in the substrate alloys resulted in a cleaner coating layer with fewer precipitates and Kirkendall voids. However, the cyclic oxidation behavior of the aluminide coatings in air + 10 vol.% H₂O at 700 °C was not noticeably changed by the N reduction.

Original language	English
Pages (from-to)	1231-1235
Number of pages	5
Journal	Surface and Coatings Technology
Volume	200
Issue number	5-6
DOIs	https://doi.org/10.1016/j.surfcoat.2005.07.081
State	Published - Nov 21 2005

Funding

The authors acknowledge L. D. Chitwood, G. W. Garner, L. R. Walker, K. S. Reeves, and K. S. Yarborough at ORNL and B. Bates and W. E. Hawkins at Tennessee Technological University (TTU) for assisting with the experimental work, and P. F. Tortorelli at ORNL for reviewing the manuscript. This research was sponsored by the U.S. Department of Energy, Fossil Energy Advanced Materials Research Program, under contract DE-AC05-00OR22725 with UT-Battelle LLC and subcontract 4000007035 with TTU.

Funders	Funder number
Fossil Energy Advanced Materials Research Program	DE-AC05-00OR22725
U.S. Department of Energy
UT-Battelle	4000007035

Keywords

ALN
Austenitic steel
Ferritic steel
Iron aluminide coatings
Nitrogen
Oxidation

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10.1016/j.surfcoat.2005.07.081

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title = "Effect of nitrogen on the formation and oxidation behavior of iron aluminide coatings",

abstract = "The present study focused on the effect of N in ferritic Fe-9Cr-1Mo and austenitic 304 L alloy substrates on the formation and cyclic oxidation behavior of aluminide coatings fabricated by chemical vapor deposition (CVD). Relatively high N contents in the commercial alloys caused the formation of AlN precipitates in the CVD aluminide coating, which adversely affected the adhesion of the as-deposited coatings, particularly on 304 L. The reduction of N content in the substrate alloys resulted in a cleaner coating layer with fewer precipitates and Kirkendall voids. However, the cyclic oxidation behavior of the aluminide coatings in air + 10 vol.% H2O at 700 °C was not noticeably changed by the N reduction.",

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AU - Zhang, Y.

AU - Pint, B. A.

AU - Cooley, K. M.

AU - Haynes, J. A.

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N2 - The present study focused on the effect of N in ferritic Fe-9Cr-1Mo and austenitic 304 L alloy substrates on the formation and cyclic oxidation behavior of aluminide coatings fabricated by chemical vapor deposition (CVD). Relatively high N contents in the commercial alloys caused the formation of AlN precipitates in the CVD aluminide coating, which adversely affected the adhesion of the as-deposited coatings, particularly on 304 L. The reduction of N content in the substrate alloys resulted in a cleaner coating layer with fewer precipitates and Kirkendall voids. However, the cyclic oxidation behavior of the aluminide coatings in air + 10 vol.% H2O at 700 °C was not noticeably changed by the N reduction.

AB - The present study focused on the effect of N in ferritic Fe-9Cr-1Mo and austenitic 304 L alloy substrates on the formation and cyclic oxidation behavior of aluminide coatings fabricated by chemical vapor deposition (CVD). Relatively high N contents in the commercial alloys caused the formation of AlN precipitates in the CVD aluminide coating, which adversely affected the adhesion of the as-deposited coatings, particularly on 304 L. The reduction of N content in the substrate alloys resulted in a cleaner coating layer with fewer precipitates and Kirkendall voids. However, the cyclic oxidation behavior of the aluminide coatings in air + 10 vol.% H2O at 700 °C was not noticeably changed by the N reduction.

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KW - Ferritic steel

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Effect of nitrogen on the formation and oxidation behavior of iron aluminide coatings

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Keywords

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