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Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings

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Abstract

The effects of Pt incorporation on the isothermal oxidation and diffusion behavior of low-sulfur aluminide bond coatings were investigated. Aluminide (NiAl) coatings and Pt-modified aluminide (Ni,Pt)Al coatings were synthesized on a low-sulfur, yttrium-free single-crystal Ni-based superalloy by a high-purity, low-activity chemical vapor deposition (CVD) aluminizing procedure. The isothermal oxidation kinetics and scale adhesion behavior of CVD NiAl and (Ni,Pt)Al coatings before and after isothermal oxidation were determined by electron microprobe analysis. Platinum did not reduce oxide-scale growth kinetics. No significant differences in bulk refractory metal (W, Ta, Re, and Mo) distributions were observed as a result of Pt incorporation. Spallation of the alumina scale and the formation of large voids along the oxide-metal interface were commonly observed over the NiAl coating grain boundaries after 100 hours at 1150 °C. In contrast, no spallation of Al2O3 scales occurred on (Ni,Pt)Al coating surfaces or grain boundaries, although the sulfur content in the CVD (Ni,Pt)Al coatings was higher than that of the CVD NiAl coatings. Most significantly, no voids were observed at the oxide-metal interface on (Ni,Pt)Al coating surfaces or cross sections after 200 hours at 1150 °C. It was concluded that a major beneficial effect of Pt incorporation on an aluminide coatings oxidation resistance is the elimination of void growth at the oxide-metal interface, likely by mitigation of detrimental sulfur effects.

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Authors and Affiliations

  1. the Center for Manufacturing Research, Tennessee Technological University, 38505-0001, Cookeville, TN

    Y. Zhang (Research Professor)

  2. the Oak Ridge National Laboratory, 37831-6063, Oak Ridge, TN

    J. A. Haynes (Research Staff Member), G. Wright (Research Staff Member), B. A. Pint (Research Staff Member) & K. M. Cooley (Technician)

  3. the Department of Chemical, Biochemical and Materials Engineering, Stevens Institute of Technology, Hoboken, NJ

    W. Y. Lee (Associate Professor and Department Director)

  4. the Department of Materials Science and Engineering, University of Tennessee, 37996, Knoxville, TN

    P. K. Liaw (Professor)

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Zhang, Y., Haynes, J.A., Wright, G. et al. Effects of Pt incorporation on the isothermal oxidation behavior of chemical vapor deposition aluminide coatings. Metall Mater Trans A 32, 1727–1741 (2001). https://doi.org/10.1007/s11661-001-0150-6

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  • DOI: https://doi.org/10.1007/s11661-001-0150-6

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