The Effect of Platinum on the Growth and Adhesion of alpha-Al{sub 2}O{sub 3} Scales
- University of Kentucky, Lexington, KY (United States)
- Oak Ridge National Lab., TN (United States)
Cast PtAl and NiPtAl alloys were used as model materials to study the effect of Pt on the oxidation behavior of aluminide bond coats. The addition of Pt improves alpha-Al{sub 2}O{sub 3} scale adhesion in cyclic testing at 1150{degrees}C and 1200{degrees}C. However, in comparison with aluminides which contain reactive elements (e.g. Zr and Hf), the beneficial effect of Pt was not as great. SEM and TEM analysis of the oxides indicated little effect of the Pt on scale microstructure. Using TEM/EDS analysis, Pt was not detected as a segregant to the alumina grain boundaries grown on PtAl, whereas Zr and Hf have been routinely detected. Also, no sulfur was detected at the PtAl/Al{sub 2}O{sub 3} interface. While Pt is somewhat beneficial in cast aluminides, Pt in an aluminide bond coat on a single crystal Ni-base superalloy substrate also may provide additional benefits to the overall oxidation behavior.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 620955
- Report Number(s):
- ORNL/CP--95774; CONF-9709183--; ON: DE98001908
- Country of Publication:
- United States
- Language:
- English
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