The Effect of Nitrogen on the Formation and Oxidation Behavior of Iron Aluminide Coatings Fabricated by Chemical Vapor Deposition

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/j.surfcoat.2005.07.081· OSTI ID:1003153

Zhang, Ying ^[1]; Pint, Bruce A ^[2]; Cooley, Kevin M ^[2]; Haynes, James A ^[2]

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1. Tennessee Technological University
2. ORNL

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.% H{sub 2}O at 700 C was not noticeably changed by the N reduction

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: FE USDOE - Office of Fossil Energy (FE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003153
• Journal Information: Surface and Coatings Technology, Vol. 200, Issue 5-6; ISSN 0257-8972
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESION
AIR
ALLOYS
ALUMINIUM NITRIDES
AUSTENITIC STEELS
BEHAVIOR
CHEMICAL VAPOR DEPOSITION
COATINGS
FERRITIC STEELS
IRON
LAYERS
NITROGEN
OXIDATION
REDUCTION
SUBSTRATES
VOIDS