The influence of unshielded small cracks in the fracture toughness of yttria and of ceria stabilised zirconia
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The fracture toughness, Ric of two 3Y-ZrO2 with different grain size (177 and 330 nm) and 12Ce-ZrO2 were determined from a sharp micro-machined notch by Ultra-Short Pulsed Laser Ablation (UPLA) where a micro-cracked zone and non-transformed is generated in front of the notch. The notch plus the damage behaved as an unshielded edge surface crack. The fracture stress, sigma(f) of both 330 nm-3Y-ZrO2 and 12Ce-ZrO2 with similar short crack sizes were found to be comparable in despite of their different published R-curves. The results of K-IC were discussed in terms of the type of cracks induced and by using a simple R-curve model. It was concluded that for the development of high strength composites with 12Ce-ZrO2 as the matrix, the relevant K-IC that controls the sigma(f) with surface unshielded short cracks is much closer to the intrinsic K-IC than to the indentation K-IC or to the plateau K-IC of long cracks. (C) 2015 Elsevier Ltd. All rights reserved.
CitationMelk, L., Turón Viñas, M., Roa, J.J., Antti, M., Anglada, M. The influence of unshielded small cracks in the fracture toughness of yttria and of ceria stabilised zirconia. "Journal of the european ceramic society", 01 Gener 2016, vol. 36, núm. 1, p. 147-153.
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