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Isothermal Oxidation of Pt Modified and Ru Modified Aluminide Coating on a Fourth Generation Single Crystal Superalloy

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Abstract:

Isothermal oxidation behavior of a 4th generation Ni-base single crystal superalloy with Pt-modified and Ru-modified aluminide coating was examined in a temperature range 1223 to 1373 K in air. Both Pt and Ru modification improve the oxidation resistance of a simple aluminide coating, especially above 1273 K. They allow thin protective and continuous Al2O3 scales to be intact for at least 500 h at temperatures up to 1323 K. However, the Pt modification drastically accelerates the formation of a secondary reaction zone (SRZ). This suggests that Pt promotes the formation of a topologically close-packed phase by lowering the solubility of refractory elements in γ-Ni. In contrast, the Ru modification reduces the SRZ, and is expected to enhance the phase stability under the coating by preventing the depletion of Ru due to its outward diffusion.

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Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

301-308

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.301

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Online since:

August 2006

Authors:

Yuki Matsuoka, Yasuo Matsunaga, Kiyokazu Nakagawa, Shigeji Taniguchi

Keywords:

4th Generation Ni-Based SC Superalloy, Aluminide, Oxidation, Pt, Ru, SRZ

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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