| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
|
| Symposium
|
General Abstracts: Structural Materials Division
|
| Presentation Title |
High-Temperature Cyclic Oxidation of Pd/Pt-Modified Nial Bond Coats |
| Author(s) |
Raghavendra R Adharapurapu, Dan Widrevitz, Jun Zhu, Don Lipkin, Voroman Dheeradhada, Tresa Pollock |
| On-Site Speaker (Planned) |
Raghavendra R Adharapurapu |
| Abstract Scope |
Oxidation resistant NiAl-based bond coats are an important element of thermal barrier coating systems. A combinatorial approach to investigating the effects of higher order additions to NiAl, including Pt, Pd and Hf, on the oxidation and interdiffusion behavior of the bond coats has been developed. Bond coats with compositions in the range of Ni-(33-39)Al-5Cr-(2-8)Pd/Pt were deposited on RenéN5 substrates. Long-term cyclic-oxidation experiments on Pd/Pt-modified NiAl+Hf at 1100<SUP>o</SUP>C revealed similar oxidation kinetics in both type of coatings. While the alumina scales formed on Pd-modified bond coats were slightly thicker than the Pt-modified ones, both exhibited a high resistance to large-scale spalling. Microprobe measurements have also shown that the difference in the penetration depths of Pd and Pt into the substrate are not as large as expected from the higher interdiffusion-coefficient of Pd in NiAl/Ni. SEM and XRD analysis of the oxidation products at various stages of oxidation will be presented. |
| Proceedings Inclusion? |
Definite: A CD-only volume |