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Effect of the superalloy composition on the isothermal oxidation behaviour of TBC systems

Abstract : The isothermal oxidation behaviour of TBC systems based on a first-generation superalloy, AM1 and a fourth-generation one, MCNG, was investigated and compared. The main difference between both is the addition of Re, Ru and Hf in the MCNG composition. The systems consisted of a Pt-modified nickel aluminide (Ni,Pt)Al bond coat deposited on the superalloy and with or without a yttria-stabilized zirconia ceramic top coat. Isothermal oxidations were performed at 1,100 °C in synthetic air for 10, 50, 500 and 1,000 h. The MCNG-based system exhibited a better spallation resistance than the AM1-based one and a lower oxidation rate. Spallation always occurred at the thermally grown oxide/bond coat interface. For both systems, transformation of the β-phase into the γ′-phase was observed. In the MCNG-based samples, the β-(Ni,Pt)Al was enriched in ruthenium and the secondary reaction zone strongly extends, whereas chromium precipitation occurred in the AM1-based ones.
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Submitted on : Friday, February 21, 2014 - 2:46:21 PM
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Marion Chieux, Cecilie Duhamel, Régine Molins, Luc Rémy, Jean Yves Guedou. Effect of the superalloy composition on the isothermal oxidation behaviour of TBC systems. Oxidation of Metals, Springer Verlag, 2014, 81, pp.57-67. ⟨10.1007/s11085-013-9418-7⟩. ⟨hal-00950477⟩



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