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

Journal of Non-Crystalline Solids Elsevier

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 (WW3) 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

Medizinische Universität Wien AT 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://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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