High-temperature cyclic oxidation behaviour of Pt-rich γ-γ’ coatings. Part I: Oxidation kinetics of coated AM1 systems after very long-term exposure at 1100 °C

Pauline Audigié (1) , Aurélie Vande Put (1) , André Malié (2) , Daniel Monceau (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 SAFRAN Group

The cyclic oxidation behaviour of several compositions of Pt-rich γ-γ’ bond-coatings on AM1 superalloy was studied at 1100 °C and was compared to the β-(Ni,Pt)Al coated and uncoated superalloy. AM1 superalloy exhibited an outstanding performance due to an optimized Hf doping and a low sulfur content. The Pt-rich γ-γ’ bond-coatings showed a better cyclic oxidation resistance than the reference system with a β-(Ni,Pt)Al coating. Aluminium addition during fabrication was found to be beneficial to improve the oxidation behaviour of Pt-rich γ-γ’ bond-coatings. Their breakaway resulted from an insufficient aluminium content below the TGO whereas the reference system suffered from rumpling.

Mots clés: Metal coatings; Platinum; Aluminium; Superalloys; Oxidation

Domaines: Matériaux

Pauline Audigié, Aurélie Vande Put, André Malié, Daniel Monceau. High-temperature cyclic oxidation behaviour of Pt-rich γ-γ’ coatings. Part I: Oxidation kinetics of coated AM1 systems after very long-term exposure at 1100 °C. Corrosion Science, 2018, 144, pp.127-135. ⟨10.1016/j.corsci.2018.08.050⟩. ⟨hal-02015779⟩