Effect of Alumina on the Strength, Fracture Toughness, and Crystal Structure of Fluorcanasite Glass-Ceramics |
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Authors: | Nai-Zheng Zhang Kenneth J Anusavice |
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Affiliation: | Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610–0446 |
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Abstract: | The influence of alumina content (0-15 wt% Al2O3) on the indentation strength, fracture toughness ( K I c ), and crystal structure of fluorcanasite (Al2O3-CaO-F-K2O-Na2O-SiO2) glass-ceramics was analyzed. Increasing the Al2O3 content from 0 wt% (CAN0) to 8 wt% (CAN8) caused the mean indentation strength and K I c values to decrease from 213 ± 14 MPa and 2.7 ± 0.1 MPa·m1/2, respectively, for the CAN0 glass-ceramic to 78 ± 16 MPa and 1.3 ± 0.2 MPa·m1/2, respectively, for the CAN8 glass-ceramic. Increased Al2O3 concentrations (0-15 wt%) significantly affected the crystal size, crystal shape, aspect ratio, and crystal aggregation characteristics of the fluorcanasite glass-ceramics. The addition of greaterthan equal to8 wt% of Al2O3 to fluorcanasite glass caused a transformation from canasite to leucite. |
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