HAL : hal-00512783, version 1

DOI : 10.3184/096034005782744308

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Materials at high temperatures 22 (2005) 411-420

Performance and Thermal Stability of Pt-modified Al-diffusion Coatings for Superalloys under Cyclic and Isothermal Conditions

A. Littner 1, Fernando Pedraza 2, A.D Kennedy 3, P. Moretto 4, L. Peich 5, T. Weber 1, M. Schütze 1

(2005)

In this pa 1150°C of Pt-aluminide coatings deposited on a single crystal Ni-based superalloy is reported. The different coatings involve the well-known bi-phase (Ni,Pt)Al and PtAl2 as well as single phase (Ni,Pt)Al coatings with various compositions and microstructures. The results showed that the cyclic oxidation performance depends strongly on the average Pt-content present in the coating and, to a lesser extent, on the coating microstructure. Moreover, no relevant effect of the Al content could be evidenced. Surface deformation occurred during exposure and was attributed to phase transformations within the coating. This assumption was confirmed by isothermal experiments between 1050 and 1200°C. Post-experimental investigations of tested specimens were performed by optical and scanning electron microscopy, X-ray diffraction and EPMA.

1 :	Karl Winnacker Institute
	DECHEMA, e.V.
2 :	Laboratoire d'Etude des Matériaux en Milieux Agressifs (LEMMA)
	Université de La Rochelle : EA3167
3 :	SIFCO Turbine Components
	SIFCO Turbine Components
4 :	Institute for Energy
	JRC
5 :	MTU Aero Engines
	MTU Aero Engines

Domaine

:

Chimie/Matériaux

Mots Clés : Pt-Al diffusion coatings – superalloys – oxidation protection

hal-00512783, version 1

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Contributeur : Fernando Pedraza <>

Soumis le : Mercredi 1 Septembre 2010, 23:46:44

Dernière modification le : Jeudi 2 Décembre 2010, 11:25:39