Influence of isothermal and cyclic oxidation on the apparent interfacial toughness in thermal barrier coating systems

Y. Liu (1, 2) , Vanessa Vidal (1) , Sabine Le Roux (1) , Fabien Blas (1, 2) , Florence Ansart (2) , Philippe Lours (1)

1 ICA - Institut Clément Ader
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

In thermal barrier coatings (TBCs), the toughness relative to the interface lying either between the bond coat (BC) and the Thermal Grown Oxide (TGO) or between the TGO and the yttria stabilized zirconia topcoat (TP) is a critical parameter regarding TBCs durability. In this paper, the influence of aging conditions on the apparent interfacial toughness in Electron Beam-Physical Vapor Deposition (EB-PVD) TBCs is investigated using a specifically dedicated approach based on Interfacial Vickers Indentation (IVI), coupled with Scanning Electron Microscopy (SEM) observations to create interfacial cracks and measure the extent of crack propagation, respectively.

Mots clés: TBC systems; Cracking; Oxidation; Spallation; EB-PVD; Interfacial indentation

Domaines: Sciences de l'ingénieur [physics]

Y. Liu, Vanessa Vidal, Sabine Le Roux, Fabien Blas, Florence Ansart, et al.. Influence of isothermal and cyclic oxidation on the apparent interfacial toughness in thermal barrier coating systems. Journal of the European Ceramic Society, 2015, 35 (15), p. 4269-4275. ⟨10.1016/j.jeurceramsoc.2015.07.018⟩. ⟨hal-01611001⟩