Investigation of the microstructure of platinum-modified aluminide coatings

Fernando Pedraza (1) , A.D Kennedy (2) , J. Kopecek (3) , P. Moretto (3)

1 LEMMA - Laboratoire d'Etude des Matériaux en Milieux Agressifs
2 SIFCO Turbine Components
3 IET - JRC Institute for Energy and Transport

The high temperature performance of Pt-modified aluminide coatings is directly related to their composition and microstructure. In this work, several of the factors that control such features are investigated on a single crystal Ni base superalloy. It will be shown that the bi-phase PtAl2 + (Ni,Pt)Al composition is more prone to occur at higher Pt surface concentrations, lower temperatures and shorter aluminising treatments. The alloying elements also seem to play a role in the achievement of either a single or a bi-phase structure. Finally, the incorporation of different elements to the Pt/Al coatings brings about shifting of the X-ray peaks, which in turn may indicate the presence of residual stresses.

Mots clés: single crystal nickel superalloy; out-of-pack platinum-modified aluminide coatings; single phase

Domaines: Matériaux

Fernando Pedraza, A.D Kennedy, J. Kopecek, P. Moretto. Investigation of the microstructure of platinum-modified aluminide coatings. Surface and Coatings Technology, 2006, 200, pp.4032- 4039. ⟨10.1016/j.surfcoat.2004.12.019⟩. ⟨hal-00512807⟩