Communication Dans Un Congrès Année : 2009

Ni–W diffusion barrier: Its influence on the oxidation behaviour of a β-(Ni,Pt)Al coated fourth generation nickel-base superalloy

Résumé

A Ni–W base diffusion barrier (DB) has been developed to limit interdiffusion between a fourth generation Ni-base superalloy (MCNG) and a Pt-modified nickel aluminide bondcoat. After long term oxidation, the DB layer permits to reduce the Al depletion in the coating and to delay the phase transformations in the coating. But despite this result, the oxidation behaviour of the system with DB is slightly worse than without the DB. This difference may be caused by the addition of S and/orWin the coating of the system with the DB. The DB layer also delays the Secondary Reaction Zone (SRZ) formation. Nevertheless, the propagation of the SRZ is similar in systems with and without a DB, with growth kinetics which are driven by interdiffusion.

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hal-04028015 , version 1 (14-03-2023)

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  • HAL Id : hal-04028015 , version 1

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Eric Cavaletti, Serge Naveos, Stéphane Mercier, Pierre Josso, Marie-Pierre Bacos, et al.. Ni–W diffusion barrier: Its influence on the oxidation behaviour of a β-(Ni,Pt)Al coated fourth generation nickel-base superalloy. 36th International Conference on Metallurgical Coatings and Thin Films, Apr 2009, San Diego, United States. pp.761-765. ⟨hal-04028015⟩
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