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The influence of unshielded small cracks in the fracture toughness of yttria and of ceria stabilised zirconia
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
CIEFMA—Department of Materials Science and Metallurgical Engineering, ETSEIB, Universitat Politècnica de Catalunya.
Department of Materials Science and Engineering, Universitat Politècnica de Catalunya, Barcelona.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-3661-9262
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2016 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 36, no 1, p. 147-153Article in journal (Refereed) Published
Abstract [en]

The fracture toughness, KIC 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, σf 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 KIC 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 KIC that controls the σf with surface unshielded short cracks is much closer to the intrinsic KIC than to the indentation KIC or to the plateau KIC of long cracks.

Place, publisher, year, edition, pages
2016. Vol. 36, no 1, p. 147-153
National Category
Other Materials Engineering
Research subject
Engineering Materials
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URN: urn:nbn:se:ltu:diva-3427DOI: 10.1016/j.jeurceramsoc.2015.09.017ISI: 000364254700016Scopus ID: 2-s2.0-84944463803Local ID: 14045aad-2d0c-4d18-867f-60d3ab3aa8daOAI: oai:DiVA.org:ltu-3427DiVA, id: diva2:976285
Note
Validerad; 2016; Nivå 2; 20150928 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Melk, LatifaAntti, Marta-Lena

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