Abstract
The isothermal and cyclic oxidation behavior of PtAl and PtAl+Zr was studied followed by postoxidation microstructural and microchemical analyses. Their isothermal oxidation performance at 1200 °C was similar to that of NiAl and NiAl+Zr. In short (1-h) cycles, the cyclic oxidation resistance of undoped PtAl was found to be substantially better than NiAl. However, with longer (100-h) cycles, little improvement in the metal consumption rate was observed relative to NiAl. The addition of Zr to PtAl significantly improved cyclic oxidation performance in both short- and long-cycle tests. Spatially resolved energy dispersive spectroscopy indicated Zr segregation to both the metal-oxide interface and Al2O3 grain boundaries.
| Original language | English |
|---|---|
| Pages (from-to) | 4531-4540 |
| Number of pages | 10 |
| Journal | Journal of Materials Research |
| Volume | 14 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 1999 |
Funding
The authors thank T. Geer and J.W. Jones at ORNL, who assisted with the metallography and TEM sample preparation, and P.F. Tortorelli, C. Leyens, and J.R. DiStefano for reviewing the manuscript. This research was sponsored by the United States Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Industrial Technologies, as part of the Advanced Turbine Systems Program under Contract DE-AC05-96OR226464. E.C.D.’s participation was supported through an ORNL-High Temperature Materials Laboratory Fellowship and the ORNL SHaRE Program.
| Funders | Funder number |
|---|---|
| ORNL-High | |
| Office of Industrial Technologies | DE-AC05-96OR226464 |
| United States Department of Energy | |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory |