Comparison of the cyclic oxidation behavior of beta-NiAl, beta-NiPtAl and gamma-gamma prime NiPtAl coatings on various superalloys

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/j.surfcoat.2007.06.039· OSTI ID:952210

Haynes, James A ^[1]; Pint, Bruce A ^[1]; Zhang, Ying ^[2]; Wright, Ian G ^[1]

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1. ORNL
2. Tennessee Technological University

Abstract The influence of exposure temperature on the cyclic oxidation behavior of simple and platinum aluminide coatings on various superalloy substrates was investigated. Coatings of -NiAl, -NiPtAl and - ' NiPtAl were tested and compared in dry oxygen at 1050 - 1150 aC. There was a clear influence of substrate sulfur content on the oxidation behavior of -NiAl coatings at all three temperatures. The impact of substrate impurities, especially S content, was significantly reduced for -NiPtAl coatings at all three temperatures. Simple { ' NiPtAl coatings showed excellent oxidation behavior up to 1100 aC on some alloys, but were more sensitive to substrate composition, especially Hf content, than were -NiPtAl coatings.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Temperature Materials Laboratory
• Sponsoring Organization: FE USDOE - Office of Fossil Energy (FE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 952210
• Journal Information: Surface and Coatings Technology, Journal Name: Surface and Coatings Technology Journal Issue: 4-7 Vol. 202; ISSN 0257-8972; ISSN SCTEEJ
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
COATINGS
HEAT RESISTING ALLOYS
IMPURITIES
OXIDATION
OXYGEN
PLATINUM
SUBSTRATES
SULFUR CONTENT
bond coats
coatings
high temperature
oxidation
superalloys