The effect of Pt content on γ-γ′ NiPtAl coatings

J. A. Haynes, B. A. Pint, Y. Zhang, I. G. Wright

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46 Scopus citations

Abstract

This study investigated the impact of Pt content on the coating composition and subsequent oxidation behavior of γ-γ′ NiPtAl diffusion coatings. Coatings were fabricated by vacuum annealing electroplated Pt on single-crystal and directionally-solidified superalloy substrates. Specimens with 7 and 12 μm thick layers of electroplated Pt were annealed at 1100 or 1175 °C. Coating compositions were characterized to evaluate the distribution of Pt and Al as a function of annealing temperature and Pt thickness. Selected coatings were evaluated in cyclic oxidation at 1100 and 1150 °C. Coatings with higher Pt contents showed improvements in spallation resistance, particularly at 1100 °C for a directionally-solidified superalloy substrate with higher Hf and S contents.

Original languageEnglish
Pages (from-to)413-416
Number of pages4
JournalSurface and Coatings Technology
Volume203
Issue number5-7
DOIs
StatePublished - Dec 25 2008

Keywords

  • Aluminide coatings
  • Bond coatings
  • High temperature oxidation
  • Platinum coatings
  • Platinum effect
  • TBC

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