Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1661656 | Surface and Coatings Technology | 2007 | 5 Pages |
Abstract
The cyclic oxidation behavior of simple aluminide and platinum aluminide coatings on various superalloy substrates was investigated at three temperatures. Coatings of β-NiAl, β-NiPtAl and Pt-modified γ-γⲠwere tested and compared in dry oxygen at 1050, 1100 and 1150 °C. There was a clear influence of substrate sulfur content on the oxidation behavior of β-NiAl coatings at all temperatures. The impact of substrate impurities, especially S content, was significantly reduced for β-NiPtAl coatings at all temperatures. Simple Pt-modified γ-γⲠcoatings showed excellent oxidation behavior up to 1100 °C on some alloys, but were more sensitive to substrate composition, especially Hf content, than were β-NiPtAl coatings.
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Authors
J.A. Haynes, B.A. Pint, Y. Zhang, I.G. Wright,