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-γ′ were 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-γ′ coatings 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.
| Original language | English |
|---|---|
| Pages (from-to) | 730-734 |
| Number of pages | 5 |
| Journal | Surface and Coatings Technology |
| Volume | 202 |
| Issue number | 4-7 |
| DOIs | |
| State | Published - Dec 15 2007 |
Funding
The authors acknowledge K.M. Cooley, G.W. Garner, L. R. Walker at ORNL and L.R. Liu at Tennessee Technological University for assisting with the experimental work, and M.J. Lance, T.M. Besmann and P.F. Tortorelli for reviewing the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Coal and Power R&D, Office of Fossil Energy, under contract DE-AC05-00OR22725 with UT-Batelle LLC. The work was also supported by the National Science Foundation-GOALI Program under Grant No. 0504566.
| Funders | Funder number |
|---|---|
| National Science Foundation-GOALI Program | 0504566 |
| Office of Coal and Power R&D | |
| UT-Batelle LLC | |
| U.S. Department of Energy | |
| Office of Fossil Energy | DE-AC05-00OR22725 |
Keywords
- Aluminide
- Coating
- Oxidation
- Platinum
- TBC