Double Torsion testing of thin porous zirconia supports for energy applications: Toughness and slow crack growth assessment

Peyman Khajavi , Jérome Chevalier (1) , Peter Vang Hendriksen , Joe W Tavacoli (2) , Laurent Gremillard (1) , Henrik Lund Frandsen

1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
2 PMMH - Physique et mécanique des milieux hétérogenes (UMR 7636)

Thin, porous zirconia-based ceramic components are of high interest in energy application devices where they are used as structural ceramics. Mechanical reliability of such devices is not only dependent on the fracture toughness of the ceramic components, but also on their sensitivity to slow crack growth (SCG). In this work, the fracture toughness and SCG behavior of porous (4.5 to 45.5%) and thin (~ 0.25 mm) 3Y-TZP ceramics are investigated using the Double Torsion method. The analysis of the double torsion data, previously developed for dense materials, was here assessed and adapted. The compliance of the samples was observed to change linearly with crack length and the measured stress intensity factor was dependent on crack length, as for dense materials. This dependency decreased by increasing the sample porosity. For all materials, the ratio of the SCG threshold to fracture toughness was of 0.56 ± 0.06.

Mots clés: Slow crack growth; Porosity; Double torsion; Solid oxide cells; Energy applications

Domaines: Matériaux

Peyman Khajavi, Jérome Chevalier, Peter Vang Hendriksen, Joe W Tavacoli, Laurent Gremillard, et al.. Double Torsion testing of thin porous zirconia supports for energy applications: Toughness and slow crack growth assessment. Journal of the European Ceramic Society, 2020, 40 (8), pp.3191-3199. ⟨10.1016/j.jeurceramsoc.2020.02.019⟩. ⟨hal-02534380⟩