Self-healing thermal barrier coating systems fabricated by spark plasma sintering

Franck Nozahic (1) , Claude Estournès (1) , Alexandra Lucia Carabat (2) , Willem G. Sloof (2) , Sybrand van Der Zwaag (2) , Daniel Monceau (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 TU Delft - Delft University of Technology

The present paper focuses on the Spark Plasma Sintering (SPS) manufacturing of a new type of self-healing thermal barrier coating (TBC) and a study of its thermal cycling behaviour. The ceramic coating consists on an Yttria Partially Stabilized Zirconia (YPSZ)matrix intowhich healing agents made of MoSi2-Al2O3 core-shell particles are dispersed prior to sintering. The protocol used to sinter self-healing TBCs on MCrAlY (M: Ni or NiCo) pre-coated Ni-based superalloys is described and the reaction between the particles and the MCrAlY bond coating as well as the preventive solutions are determined. Thermal cycling experiments are performed on this complete multilayer systemto study the crack healing behaviour. Post-mortem observations highlighted local healing of cracks due to the formation of silica and the subsequent conversion to zircon at the rims of the cracks.

Mots clés: Spark plasma sintering; Self-healing thermal barrier coatings; High-temperature cyclic oxidation; Intermetallic particles; Multi-layer materials; Ceramic matrix composites

Domaines: Matériaux

Franck Nozahic, Claude Estournès, Alexandra Lucia Carabat, Willem G. Sloof, Sybrand van Der Zwaag, et al.. Self-healing thermal barrier coating systems fabricated by spark plasma sintering. Materials & Design, 2018, 143, pp.204-213. ⟨10.1016/j.matdes.2018.02.001⟩. ⟨hal-01727587⟩