Fracture anisotropy in texturized lithium disilicate glass-ceramics
Belli R, Wendler M, Cicconi MR, de Ligny D, Petschelt A, Werbach K, Peterlik H, Lohbauer U (2018)
Publication Status: Published
Publication Type: Journal article
Publication year: 2018
Journal
Publisher: ELSEVIER SCIENCE BV
Book Volume: 481
Pages Range: 457-469
DOI: 10.1016/j.jnoncrysol.2017.11.040
Abstract
Lithium disilicate glass-ceramics show great potential in the fabrication of anisotropic structures due to their high-strength needle-form crystalline phase subjective to processing-induced alignment. Here we explore this strategy by focusing on the mechanistic aspects of fracture. Through different variations of the fracture toughness test we demonstrate the effect of bulk crystal orientation on fracture energy, toughening mechanisms, crystal size and aspect ratio. Using the anisotropic Poisson's ratio of the Li2Si2O5 crystal phase obtained by Resonant Ultrasound Spectroscopy, we apply the new geometry factor developed by Strobl et al. to provide a more accurate insight into the anisotropic crack propagation behavior in LS2 glass-ceramics. Raman spectra and X-Ray Diffraction patterns are resolved for the Li2Si2O5 phase aligned at plane parallel, anti-plane and random orientations.We show that Li2Si2O5 crystallites oriented perpendicular to the crack growth plane tended to induce large scale crack deflection unless the crack was forced into a straight path, thereby promoting crystallite fracture, increased K-Ic-values and accentuated R-curve behavior. Crystal aspect ratio and residual stresses in the glass have been identified as important influencing factors on crack growth behavior and toughening mechanisms.
Authors with CRIS profile
Renan Belli
Department of Operative Dentistry and Periodontology
Maria Rita Cicconi
Lehrstuhl für Glas und Keramik
Dominique de Ligny
Professur für Werkstoffwissenschaften (Glas und Keramik)
Anselm Petschelt
Lehrstuhl für Zahn-,Mund- und Kieferheilkunde, insbesondere Zahnerhaltung, Parodontologie und Kinderzahnheilkunde
Ulrich Lohbauer
Medizinische Fakultät
Involved external institutions
Austria (AT)How to cite
APA:
Belli, R., Wendler, M., Cicconi, M.R., de Ligny, D., Petschelt, A., Werbach, K.,... Lohbauer, U. (2018). Fracture anisotropy in texturized lithium disilicate glass-ceramics. Journal of Non-Crystalline Solids, 481, 457-469. https://dx.doi.org/10.1016/j.jnoncrysol.2017.11.040
MLA:
Belli, Renan, et al. "Fracture anisotropy in texturized lithium disilicate glass-ceramics." Journal of Non-Crystalline Solids 481 (2018): 457-469.
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