The effect of Pt content on NiPtAl coatings

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/j.surfcoat.2008.08.063· OSTI ID:1018238

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

This study investigated the impact of Pt content on the coating composition and subsequent oxidation behavior of gamma/gamma-prime NiPtAl coatings. Gamma/gamma-prime diffusion coatings were fabricated by vacuum annealing electroplated Pt on single-crystal and directionally-solidified superalloy substrates. Specimens with 7 and 12 m thickness Pt were annealed at 1100 or 1175oC. Coating compositions were characterized to evaluate distribution of Pt and Al as a function of annealing temperature and Pt thickness. Selected coatings fabricated from 7 and 12 m Pt were evaluated in cyclic oxidation at 1100 and 1150oC. Coatings with higher Pt contents showed improvements in spallation resistance at both 1100 and 1150oC, particularly on superalloys with higher Hf and S contents.

• 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: 1018238
• Journal Information: Surface and Coatings Technology, Journal Name: Surface and Coatings Technology Journal Issue: 5-7 Vol. 203; ISSN 0257-8972
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
COATINGS
DIFFUSION COATINGS
DISTRIBUTION
HEAT RESISTING ALLOYS
OXIDATION
SPALLATION
SUBSTRATES
THICKNESS
aluminide coatings
bond coatings
oxidation testing
platinum coatings
platinum effect