Rumpling phenomenon in platinum modified Ni-Al alloys

Zimmerman, Benjamin

doi:10.2172/850069

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…Platinum enrichment in the aluminide coating improves the A1 2 0 3 scale adhesion making it an ideal candidate for the metallic bond-coat in the TBC systems. Recently it was discovered that Ptmodified P3-NiAl coatings and alloys may undergo martensitic transformation resulting in the continuous surface undulations during thermal cycling [32]. These surface undulations known as "rumpling" may result in the delamination of the top-coat.…”

Section: Cubicmentioning

confidence: 99%

Optimizing the Hot-Corrosion Resistance-of-Novel gamma-Ni+gamma-prime-Ni3A1-Based Alloys and Coatings

Gleeson¹

2006

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT ABSTRACTHigh temperature degradation by hot corrosion (650-1000 C) and/or oxidation (>1000 C) can severely reduce the longevity of advanced gas turbine engine components. The protection of high-temperature components against hot corrosion or oxidation is typically conferred by the application of either a diffusion or overlay metallic coating that is able to form a continuous, adherent, and slow growing oxide scale. There are currently no coatings that provide adequate protection to both hot corrosion and oxidation. This study assesses and advances the performance of novel modified gamma-Ni + gamma-prime Ni3AI alloys and coatings. Significant progress was achieved in this study towards the targeted goal of establishing a metallic coating that is highly resistant to both hot corrosion and high temperature oxidation. High temperature degradation by hot corrosion (650-1000'C) and/or oxidation (>1000°C) can severely reduce the longevity of advanced gas turbine engine components. The protection of high-temperature components against hot corrosion or oxidation is typically conferred by the application of either a diffusion or overlay metallic coating that is able to form a continuous, adherent, and slow growing oxide scale. However, as is shown in this study, the resistance of state-of-the-art commercial Pt-modified P3-NiA1 diffusion aluminides and CoCrAIY-based overlay coatings against both Type I (i.e., 900 0 C) and Type II (i.e., 705TC) hot corrosion is limited. Thus, there are currently no coatings that provide adequate protection to both hot corrosion and oxidation. There is indeed a particular need for such protective coatings because many advanced aero, marine, and industrial gas-turbines operate in both hot corrosion and oxidation regimes in their duty cycle. Gleeson et al. [1] recently reported that a wide range Pt+Hf-modified y'-Ni 3 Al + yNi alloy compositions form a thin, planar, adherent, and slow growing A1 2 0 3 scale. In fact, the results reported suggest that Pt+Hf-modified y'+y coatings offer a viable superior alternative to P-NiAl(Pt)-based coatings. Thus, a main aim of the present study was to establish and assess optimum target y' +y...

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Section: Cubicmentioning

confidence: 99%