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Threshold strength evaluation on an Al2O3–ZrO2 multilayered system

AuthorsBermejo, Raúl; Torres, Y.; Baudín de la Lastra, Carmen ; Sánchez Herencia, Antonio Javier; Pascual, Javier
KeywordsSlip casting
Mechanical properties
Issue Date2007
CitationJournal of the European Ceramic Society 27 (2007) 1443–1448
AbstractThe fracture behaviour of an alumina–zirconia multilayered ceramic obtained by slip casting has been evaluated and compared to monolithic alumina taken as a reference. It is found that the laminated system exhibits an apparent fracture toughness Kapt,c, calculated experimentally (SEPB) and analytically with a weight function approach, higher than twice the value determined for the monolithic material. Additionally, the experimental rupture tests accomplished indicate the existence of a threshold strength in the multilayer. The increase in Kapt,c in the laminate, associated with a pronounced R-curve behaviour, is discussed in terms of the high compressive stresses in the internal layers and their effect on the effective driving force for crack extension.
Publisher version (URL)doi:10.1016/j.jeurceramsoc.2006.05.037
Appears in Collections:(ICV) Artículos
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