Fracture toughness and strength distribution at room temperature of zirconia tapes used for electrolyte supported solid oxide fuel cells

The strength of the different zirconia tapes ranks according to their fracture toughness, while the strength distributions typically exhibit a Weibull modulus of m = 10. It was found that all tapes suffer from sub critical crack growth, which leads to a limited lifetime at a given static load and a drastic reduction of the room temperature strength at time scales relevant for actual operation.